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Autor Tema: Radite li vi folijarno prihranjivanje?!  (Posjeta: 63269 )

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Offline Mario

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Odg: Radite li vi folijarno prihranjivanje?!
« Odgovori #15 : 05-06-2008, 10:20:07 »
Ajd ne zaj...  me!

A koga ću  :dunno:

S. moj opće te ne z.... !
Ovo si mi usmeno rekel nekoliko puta, sad bu mi valjda ostalo u glavi kad sam i pročital. Vele da senilnost uopće nije loša, svaki dan čujem/š nekaj novoga  :chinaman:


Offline Sandev

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Odg: Radite li vi folijarno prihranjivanje?!
« Odgovori #16 : 05-06-2008, 10:26:49 »
E, da ti još napišem, za rundu folijarnog gnojenja potrošim jedno 10 litara otopine, to su ti dvije leđne šprice po pet litara iliti 2x10ml Folifertila. Al za jedno Substral gnojenje...  :tup: e to je katastrofa, jer dok zalijem otopinom Substrala sve , potrošim jedno 6-7 kanti po 10 litara. Zato kupujem pakiranje Substrala od 2 litre i traje mi dva-tri gnojenja. Toga se fakat troši. Ispada da je folijarno i daleko ekonomičnije. Mala flašica Folifertila mi traje skoro cijelu sezonu, a Substrala potrošim jedno pet kanistera po 2l.  :nails:  :surprised:

Offline helleborus

Odg: Radite li vi folijarno prihranjivanje?!
« Odgovori #17 : 05-06-2008, 11:26:08 »
Ako smijem dirnuti u ove činjenice, postoji još razloga zašto je bolje prihranjivati predvečer. Biljke po noći udišu, a po danu izdišu, kao što mi to radimo non-stop, one samo malo sporije. Kad udišu, sve što im serviramo, lakše će prodrjeti u njih.

Samo jedna ispravka. Biljke uvijek dišu dok su žive. I po danu i po noći. Razlika je u fotosintezi. Ona se odvija po danu. Znači da biljka po danu uzima co2 za fotosintezu, a ispušta co2 kod izdisaja, a po noći samo ispušta co2 kod izdisaja.
Da sad dalje previše ne zapetljavam. To je to.
Biljka gotovo potpuno prstaje disati, odnosno jako usporava disanje po zimi u stanju mirovanja. Sad bi se možda htjela nadovezati na naš grab koji je vjerojatno gotov. Bilo je toplo vrijeme u veljači, i on je krenuo. Krenuo je zato što je korijen dobio kisika. Orezivanjem korijena kod presađivanja i velike potrebe za vodom i kisikom dodatno ubije ponovni nalet hladnoće. a bilo je u ožujku i minus 10. Naišla sam na neki podatak da isprljenje kisika kod takvih promjena nastupa već nakon 24 sata. Tada biljka pokušava nadoknaditi hranu i disanje anaerobnim putem, bez prisustva kisika, ali to je proces s vrlo malo dobivene energije i pali samo na kratke staze.
Mi smo sad naš grab orezali (izmprovizirali defolijaciju) ne bi li ga potaknuli na rast, no bojim se da je korijen totalno gotov.
Disanje je jedno od najvažnijih stvari da bi biljka preživjela, kao i zalijevanje. Još važnije.

A ovo zakaj navečer bolje prihranjivati. Dobro je S napisao, zato kaj može na nižoj temp. duže ostati na listu i bolje se iskoristiti. Iako nije točno da se pući zatvaraju kod visokih temp. To je donekle točno. Naime, kod visokih temperatura i jakog sunca biljka se jedno vrijeme 'bori' tako da zatvori pući, no onda kad temp.preraste poželjnu ona mora otvoriti pući kako bi transpiracijom ohladila list (kao kad se mi znojimo). Zato se netom presađene i iskopane biljke stavljaju u hladovinu. Previsoka temp. im jako smeta. Biljka gubi veliku količinu vode da bi se rasphladila, a korijen je slab da naproducira toliko vode. I eto, disbalans je tu i biljka lagano odlazi.
Ono što se meni čini kod folijarnog je slijedeće. Ako prihraniš kad je vruće biljci to paše jer ju malo poškropiš no ubrzo voda ispari i na lišću vjerojatno ostane osušeno gnojivo koje se nije upilo. Zalijevaš li poslije ono se ponovo otapa ali sada u nekim nekontroliranim koncentracijama jer nemaš pojma koliko je toga ostalo na lišću. Možda se dogodi da je konc.debelo iznad dopuštene i ...ode list. Za hladnijeg vremena ili navečer većina će se gnojiva ipak uvući u biljku i neće biti problema. Evo, sad sam u ovom postu svkaj nadrobila tak da stvarno imate kaj komentirati.  :hihihi:

Offline helleborus

Odg: Radite li vi folijarno prihranjivanje?!
« Odgovori #18 : 05-06-2008, 11:31:31 »
Osim toga, puči, tj. stomata na biljci zatvorene su dok je vruće i na taj način reguliraju isparavanje vode kroz biljno tkivo, a kad temp padne, puči se otvaraju. To je razlog folijarne prihrane u predvečerje.

Mislim da je ovo krivo. Odnosno samo djelomično točno, kao što sam gore napisala. Da biljka ima zatvorene puči tijekom toplog vremena ne bi bilo problema s vjetrom i gubljenjem vode. Kaj ne? Ona se samo djelomično tako pokušava braniti. To je više prilagodba sukulentnih biljaka, kaktusa i ostalih te 'vrste'.

Offline Sandev

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Odg: Radite li vi folijarno prihranjivanje?!
« Odgovori #19 : 05-06-2008, 11:41:36 »
Osim toga, puči, tj. stomata na biljci zatvorene su dok je vruće i na taj način reguliraju isparavanje vode kroz biljno tkivo, a kad temp padne, puči se otvaraju. To je razlog folijarne prihrane u predvečerje.

Mislim da je ovo krivo. Odnosno samo djelomično točno, kao što sam gore napisala. Da biljka ima zatvorene puči tijekom toplog vremena ne bi bilo problema s vjetrom i gubljenjem vode. Kaj ne? Ona se samo djelomično tako pokušava braniti. To je više prilagodba sukulentnih biljaka, kaktusa i ostalih te 'vrste'.
Ma...ja to i nisam mislio baš tako radikalno kako sam napisao. Htjedoh samo pojednostaviti a napisah polovično i netočno, ...dakle...kajem se. Ispravka je dobra i zahvaljujem

Offline Mario

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Odg: Radite li vi folijarno prihranjivanje?!
« Odgovori #20 : 05-06-2008, 11:59:40 »
Ako smijem dirnuti u ove činjenice, postoji još razloga zašto je bolje prihranjivati predvečer. Biljke po noći udišu, a po danu izdišu, kao što mi to radimo non-stop, one samo malo sporije. Kad udišu, sve što im serviramo, lakše će prodrjeti u njih.

Samo jedna ispravka. Biljke uvijek dišu dok su žive. I po danu i po noći. Razlika je u fotosintezi. Ona se odvija po danu. Znači da biljka po danu uzima co2 za fotosintezu, a ispušta co2 kod izdisaja, a po noći samo ispušta co2 kod izdisaja.
Da sad dalje previše ne zapetljavam. To je to.

Ovo je sa znanstvenog gledišta sigurno tako i dobro da si napisala. Ono moje gledište... bolje da zadržim za sebe! Evo samo ovo...
Jednog dana kad tzv. prirodna znanost, postane duhovna znanost.... nesagledive će biti posljedice razvoja čovječanstva.

Offline Andrija Zokić

Odg: Radite li vi folijarno prihranjivanje?!
« Odgovori #21 : 29-04-2009, 20:08:15 »
Članak na koji se poziva Pall kada je riječ o folijarnom prihranjivanju:

Go read this:
http://www.ext.vt.edu/news/periodicals/commhort/2002-11/2002-11-03.html

and then you know why I belive in foliar feeding after all.


Foliar Feeding of Plant Nutrients

Virginia Vegetable, Small Fruit and Specialty Crops
November 2002; Volume 1, Issue 11

Charlie O'Dell, Ext. Horticulturist Emeritus, Virginia Tech

At the SE Strawberry Expo at Greenville, NC and the Carolina Farm Stewardship Association Conference at Boone, NC this past November, many growers expressed interest in nutritional plant health products new to this region. I am excited about such unique supplemental plant health products. Some, for soil application, contain enzymes that will cause a great increase in soil's natural population of bacteria to improve soil structure, water and air permeability and help unlock bound-up currently unavailable soil nutrients. Some, for drip irrigation to roots, improve plants without applying more nitrogen. Some, formulated for foliar application, provide fastest plant response. All are designed to supplement your soil improving fertility program. Several are OMRI certified for organic growers, some now are formulated with food-grade nutrients for sustainable, non-toxic use. With improvements in plant absorption technology, use of food-grade nutrients prevents plant absorption of heavy metals or other impurities that may be contained in non-food grade nutrients, and/or toxins that could become part of the fruits or vegetables that we would consume. Look for this information on the product labels!

For many years, horticulturists and agronomists have largely subscribed to the belief that foliar feeding of plant nutrients is an idea of dubious merit. A commonly held opinion is that foliar nutrients feeding is best employed only where a specific minor element deficiency may exist as determined by tissue test of plant foliage or leaf petioles.

Dramatic and fast correction of such nutrient deficiencies are generally always seen from such foliar applications.

Dr. H.B. Tukey, renowned plant researcher and Head of Michigan State University's Department of Horticulture back in the 1950's, working with research colleague S.H. Wittwer at MSU, first proved conclusively that foliar feeding of plant nutrients really works. Researching possible peaceful uses of atomic energy in agriculture, they used radio-active phosphorous and radio-potassium to spray plants, then measured with a Geiger counter, the absorption, movement and utilization of these and many other nutrients within plants. They found plant nutrients moved at the rate of about one foot per hour to all parts of the plants. Comparing efficiency of plant use of foliar-fed nutrients versus soil-applied nutrients near roots, they found foliar feeding provided about 95 percent efficiency of use compared to about 10 percent of use from soil applications! Likewise, speed of absorption and use by foliar applications was immediate, whereas from soil applications absorption and plant use both were very slow, thus providing a major benefit of foliar feeding where a specific plant nutrient deficiency may exist, be it major or minor plant nutrient.

You'll note from references of these researchers' work cited at the end of this article, that this very important finding was published, but only in research journals and symposia proceedings. These findings rarely found their way into the ranks of Extension educators or their grower-focused publications and other teaching materials or programs.

I am living proof of that, nor was this information taught in my academic classes way back in the late 1950¹s and early Œ60¹s. Now, a half-century later, I believe it is important to bring these science-based findings to light and publicize this work to benefit growers and their crops.

Armed with this knowledge they dug out of the research journals, commercial agricultural chemists began developing foliar feeding formulations. Their continuous product improvement research has resulted in products containing not only specific plant nutrients, but also natural plant sugars that aid rapid entry and movement into and through plants, plus cytokinins: natural plant growth hormones extracted from seaweed, now stabilized for several years of shelf life. Together with nutrients, they aid natural plant defense mechanisms to resist many plant diseases and insect pests. We know that healthier plants, like humans, are better able to resist many pests compared to those in stressed, poor condition. Also, growers know and observe that the weakest plants are the ones most often attacked by many insect, disease and mite pests. I believe such products can help improve your soil and your plants' health for higher yields with lower pest control inputs and plant nutrients costs, based on my tests over the past year and ongoing at our farm. Remember, a relatively small amount of plant nutrients, foliar-applied, can replace a much greater amount that is soil-applied, and is immediately available to plants.

The development of a low-cost, natural soybean oil-based adjuvant for use with such foliar-applied nutrients and crop protectants further improves leaf and stem coverage and retention for about $2.50/acre per application. An example, combined with foliar (or even to twigs and stems after leaf drop) potassium to benefit berry, grape and tree fruits plants in late fall/early winter, or during winter in milder areas when applied anytime temperatures are above freezing: To toughen/harden plant cells, apply one gallon per acre of foliar-formulated potassium. In two weeks apply a second spray of two gallons of foliar K per acre. Add 1 pint/acre of the soybean oil adjuvant first to the tank, then a small amount of water while agitator is running, then add the potassium product and fill tank with water with agitator running, then spray. 1 gallon of the potassium per acre plus 1 pint of adjuvant oil per acre costs about $18.50 per acre per application for materials, is rain-fast in 15 minutes and is great insurance at very low cost for high-value horticultural crops. Note: Use only 50 mesh screens at the spray tips so the cytokinins will pass through to your plants. With clean spray water, I also can remove my tip screens and can also use larger spray tips to insure no clogging.

For smaller areas foliar applications for 4 gallon back pack sprayer, use 1 ounce of the spray oil in 1 quart of water, stir, then add 16 oz. of the foliar potassium, stir, then fill tank with water while stirring. Shake tank from side to side while applying to maintain agitation to prevent settling. Do NOT apply this program through drip irrigation systems, as this product is formulated for foliar use only. Seaweed extracts may clog some drip irrigation filters. A clear potassium solution is available for drip irrigation, and also supplies no plant-tenderizing nitrogen in the fall or winter.

References cited for further reading:

1. Tukey, H.B. and Wittwer, S.H., 1956. The entry of nutrients into plants through stem, leaf and fruit, as indicated by radioactive isotopes. Progress in Nuclear Energy Biological Sciences Scries Six, pp. 106-114. McGraw-Hill. New York and Permagon Press, London.

2. Tukey, H.B., Wittwer, S.H., Teubner, F.G., and Long, W.G., 1956. Utilization of radioactive isotopes in resolving the effectiveness of foliar absorption of plant nutrients. International Conference on the Peaceful Uses of Atomic Energy, Vol. 12: 138-148. United Nations, N.Y.

3. Witter, S.H., Teubner, F.G. and McCall, W.W. 1956. Comparative absorption and utilization by beans and tomatoes of phosphorus applied to the soil and foliage. Proceedings, American Society for Horticultural Science. (needs vol and pp numbers from Barden).
andbonsai.com ~ andbonsai studio

Offline Marija

Odg: Radite li vi folijarno prihranjivanje?!
« Odgovori #22 : 16-05-2009, 11:41:02 »
Evo što znanost kaže:

Konvecionalna nasuprot folijarne gnojidbe
U poslijednje vrijeme sve je više folijarnih gnojiva uz agresivnu reklamu za
njihovu uporabu. Mnoga od njih mogu biti korisna u korekciji deficita hraniva
tjekom vegetacije u lišću i plodovima, ali njihova uporaba nije često povoljna
(mala količina-niska koncentracija, slab učinak, cijena itd.).
Zapamtite, biljka ne može ograničiti usvajanje elemenata listom ili
plodovima. Samo neka hraniva lako i brzo se usvajaju listom. Za večinu je
usvajanje ograničeno zbog prekrivenosti lišća i plodova kutikulom, odnosno
visokom površinskom napetosti zbog koje kapljice otopine skliznu s
lista/ploda. Zbog toga se npr. Ca sprej za plodove jabuka ili krušaka mora
primjenjivati nekoliko puta tijekom sezone jer samo mali dio uđe u plodove.
Kada je folijarna primjena bolja?
• Kada je transport Ca iz korijena limitiran (nizak pH, suša) folijarna primjena
Ca rješava problem kvalitete i i čuvanja plodova.
• Kada je problem usvajanja hraniva iz tla ograničen zbog niskog ili visokog
pH, folijarna primjena je alternativa za nadoknadu deficita (dijela hraniva).
• Kad je korijen oštećen (zbijeno tlo, ležanje vode, bolest, štetnici i dr.) folijarna
primjena je način spašavanja žetve.
• Usvajanja Zn zaslužuje poseban osvrt. U tlu je Zn često imobilan i stoga slabo
raspoloživ (premda analiza tla može pokazivati dovoljnu količinu).

Konvecionalna gnojidba
Ako nema problema vezanih uz raspoloživost i transport hraniva iz tla u
biljku, primjena hraniva preko tla je efikasnija i znatno jeftinija od folijarne
primjene.


*iz skripte Vladimira Vukadinovića - Filozofija gnojidbe
Pozdrav, Marija
https://meledabonsai.com/ | Meleda Bonsai

Offline Mario

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Odg: Radite li vi folijarno prihranjivanje?!
« Odgovori #23 : 18-05-2009, 08:43:02 »
Evo što znanost kaže:

Prića ove znanosti kod mene ne pije vodu. Više mi djeluje kao antireklamni apel nego kao znanost. Priča o starijim gnojivima koja naravno sve ovo ne mogu folijarno nadomjestiti, a konvencionalna gnojidba nije ono što mi možemo održati u našim turbodrenažnim substratima sa agresivnim zaljevanjem/ispiranjem. Nemam više volje po stoti puta pričati o novim gnojivima i njihovoj učinkovitosti, samo zaključujem moj pristup....

1. Čiknšit i li nešto slično nek leži na površini substrata / 2-3x godišnje
2. Folijarna primjena brzousvojivih i brzootpuštajućih gnojiva / svakih 7 dana
3. Prihrana u tlo sa izbalansiranim gnojivom, brzootpuštajućim / 5x u sezoni rasta

.... za mene amen  :chinaman:

Offline Andrija Zokić

Odg: Radite li vi folijarno prihranjivanje?!
« Odgovori #24 : 19-09-2009, 22:07:26 »
Još o folijarnoj prihrani:

Foliar Feeding

The problem is that most of these claims are based on some research done by Michigan State University in the 1950’s in which, by the use of raidolabeled nutrients, it was determined that the leaf is a very efficient organ for absorption. The amounts absorbed were actually very low but the efficiency was high, leading to false claims that foliar feeding was many times more effective than soil applications.

Linda Chalker-Scott, an Extension Horticulturist and Associate Professor at the Puyallup Research and Extension Center of Washington State University, clarifies this in her article, “The Myth of Foliar Feeding.”

“Obviously, materials applied directly to a leaf are more likely to enter the leaf in large quantity than the same materials applied to soil. Leaching, chemical reactions, microbial activity, etc. can decrease what actually reaches the roots and is taken up into the plant. But material applied to the leaf do not necessarily travel throughout the entire plant as effectively as they do through root uptake. The often remain in the same or adjoining tissues but travel no further. This is especially true of those elements recognized as “immobile” within plant tissues (apart from root uptake and xylem transport).”

Linda goes on to state that the nutrients plants need the most of are the very ones that cannot be absorbed in large enough quantities by the leaf to do any good, such as nitrogen, phosphorus, and potassium. She also specifically states some facts based on research that may surprise many bonsaists, such as:

    * Tree and shrub species differ dramatically in their ability to absorb foliar fertilizers.
    * Micronutrients are the only minerals that can be effectively applied by foliar feeding and too much of these can damage or kill a plant.
    * Foliar spraying is only a temporary solution to the larger problem of soil nutrient availability.
    * Any benefit from foliar spraying of landscape trees or shrubs is minor considering the cost and labor required.

The common myth of foliar feeding is based on misreading and/or misinterpreting research done over 40 years ago. Since that time it has been shown that foliar feeding is ineffective in almost every aspect promoted by the companies that sell products designed for the practice. In fact, foliar feeding has been shown to work the best only in the case of soil with low nutrient availability, in other words, when a plant has no other option for nutrients. As bonsaists, our soil would never reach the level needed for foliar feeding to do any good.

Bonsai need nitrogen, phosphorus, and potassium the most, as do any other plants and these nutrients are the very ones that foliar feeding is the worst at providing.

It is my personal opinion that any success by bonsaists using foliar feeding can be directly attributed to the mixture running off onto the soil, not through absorption through the leaves. The common practice of watering from above and dosing the foliage puts the nutrients into the soil, even though the bonsaist believes they are foliar feeding.

Based on every single professional horticulturist statements on the subject that I could find, as well as studies from major universities, there is no other logical conclusion other than foliar feeding is ineffective, a waste of time, a waste of resources, and all claims to its validity are false.

The truth is that foliar feeding offers no advantages at all to the bonsaist.

by Will Heath

> Debunking the Myths of Bonsai
> bonsainut.com - Foliar Feeding - Myth?





Linda Chalker-Scott, Ph.D., Extension Horticulturist and Associate Professor,
Puyallup Research and Extension Center, Washington State University


The Myth of Foliar Feeding

“Fertilizers sprayed on the leaves of trees and shrubs are more effective than soil applications”


The Myth

Recently, I received an email from a professional colleague whose clients often ask about foliar feeding
as a method of fertilizing plants. As he says, “All the water soluble fertilizer companies advertise the
practice all the time.” What, he wondered, was my opinion of the practice?
Foliar feeding involves spraying the foliage of target plants with water-based fertilizers. The logic for the
practice is based on scientific research from the 1950’s, which demonstrated that leaves can take up
minerals through their stomata, and in some cases through their cuticles. This research is consistently
cited in the argument that foliar feeding is 8, 10, or even 20 times more effective than traditional soil
application.
In assessing the advertised claims for foliar feeding of shrubs and trees, I had particular questions that are
answered in bulleted lists below (all bullets are directly from marketing media):
(1) What are the advantages of foliar feeding over soil application?
• Immediate results
• Prolong bloom
• Increase crop yields
• Increase storage life of food crops
• Boost growth during dry spells
• Increase cold and heat tolerance
• Increase pest and disease resistance
• Maximize plant health and quality
• Help the internal circulation of the plant
(2) When should one use foliar nutrients sprays?
• When the soil is too cold for conversion of nutrient elements into usable forms
• When it is at least 72°F
• Any time except when it is too hot or too cold
• Transplant time
• Bloom time
• When a quick growth response is desired
• After fruit set
• Every 2-3 weeks
• Any time of stress
• As long as the plant has leaves that aren’t dormant
• When the soil is deficient in nutrients
(3) What time of the day, and in what quantity, should you apply foliar fertilizers?
• Early morning
• Until it drips from the leaves
• There is no improper way
(4) How long will material last on the leaves?
• 24 hours
• 1-2 days
• Four weeks
(5) What nutrients are critical components of foliar feed fertilizers?
• Nitrogen
• Phosphorus
• Micronutrients
(6) Apart from commercial formulas, what should homemade mixtures contain?
• Seaweed
• Compost tea
• Natural apple cider vinegar
• Blackstrap molasses
• Fish emulsion
• Baking soda
As one company states, “In our opinion, foliar feeding is by far the best approach to use to insure
maximum growth, yields, and quality by overcoming limitations of the soil and its ability to transfer
nutrients into the plant.”

The Reality

If these laundry lists look more like a multiple choice test rather than solid information, it’s not surprising.
Foliar feeding is yet another agricultural practice best suited to intensive crop production under specific
soil limitations rather than as a landscape management tool. Thus, advertisers take great liberties with the
facts, often resulting in contradictory messages (note especially the recommended temperature
conditions!). Rather than individually refute the numerous errors in the claims, I’ll explain when foliar
feeding might actually be beneficial.
The original 1950’s research came from Michigan State University and was particularly useful in
understanding how nutrients move within plant tissues. As explained by Dr. Tukey in his testimony to
the Joint Committee on Atomic Energy, use of radiolabelled nutrients allowed his team to discover
“…that a leaf is a very efficient organ of absorption. The amounts may at first seem relatively small, but
to offset this handicap, the efficiency is high.” From this advertisers claim that foliar feeding is 8, 10 or
20 times more effective than soil application. This is not accurate for several reasons.
Obviously, materials applied directly to a leaf are more likely to enter the leaf in large quantity than the
same materials applied to the soil. Leaching, chemical reactions, microbial activity, etc. can decrease
what actually reaches the roots and is taken up into the plant. But materials applied to the leaf do not
necessarily travel throughout the entire plant as effectively as they do through root uptake. They often
remain in the same or adjoining tissues but travel no further. This is especially true of those elements
recognized as “immobile” within plant tissues (apart from root uptake and xylem transport).
Research over many decades has explored the mineral uptake and transport of many species of fruit trees,
conifers including pine and spruce species, and some hardwoods of ornamental or commercial value.
Results have been mixed in many cases, with some species responding well to treatment and others
remaining unaffected. Generally, the results suggest that foliar application of particular nutrients can be
useful in crop production situations where soil conditions limit nutrient availability. For instance,
alkaline soils do not readily release many metallic nutrients, especially iron and manganese. Zinc,
copper, magnesium, molybdenum, boron, and calcium are other micronutrients required in small
quantities that have been applied to foliage in an effort to relieve deficiencies and combat fruit disorders.
Fruit, as adjacent tissue, can benefit from foliar spray. But this is a localized application that does not
affect the trunk or roots – and therefore is not a solution to soil imbalances. In fact, researchers
consistently state that foliar treatments are a specialized, temporary solution to leaf and fruit deficiencies
in tree fruit production but will not solve larger soil management issues.
On the other hand, macronutrients, such as nitrogen, phosphorus and potassium, are needed in larger
quantities. While many of these are mobile in the plant, it is pointless to apply them to foliage as leaves
cannot take up enough material to supply the entire plant’s demands. Furthermore, foliar application of
high concentrations of such nutrients often results in leaf burn as water evaporates and the fertilizer salts
remain behind. Substituting numerous, lower concentration applications would not be cost effective.
Species differ widely in their ability to take up nutrients through their leaves. Differences in cuticle
thickness, stomatal resistance, and other genetic factors will influence uptake, as will environmental
conditions. Plants in a protected situation (like a greenhouse) have thinner and more porous cuticles than
plants in the field and take up foliar sprays much more readily. Likewise, plants adapted to arid
environments naturally have thicker, less penetrable cuticles than those from more moderate locations.
A better management solution to the problem of nutrient availability is to choose plants that can adapt to
the existing soil conditions. If you have alkaline or calcareous soils, for heaven’s sake don’t install acid
loving plants! Poor plant selection in terms of mineral nutrition will be a management problem for the
lifetime of the plant – which may be pretty short. Choose cultivars of species that are more resistant to
alkaline soils – they are able to acidify the root environment so that micronutrients are remobilized from
the soil and available for uptake.
The existing research does not justify foliar fertilization of landscape plants as a general method of
mineral nutrition. It can be useful for diagnosing deficiencies; for instance, spraying leaves with iron
chelate can help determine if interveinal chlorosis is from iron deficiency. It would obviously have
benefit for those landowners with landscape fruit trees that perpetually have flower or fruit disorders
associated with micronutrient deficiencies. Applying fertilizers to leaves (or the soil) without regard to
actual mineral needs wastes time and money, can injure plant roots and soil organisms, and contributes to
the increasing problem of environmental pollution.

The Bottom Line

• Tree and shrub species differ dramatically in their ability to absorb foliar fertilizers.
• Proper plant selection relative to soil type is crucial to appropriate mineral nutrition.
• Foliar spraying is best accomplished on overcast, cool days to reduce leaf burn.
• In landscape plants, foliar spraying can test for nutrient deficiencies, but not solve them.
• Micronutrients are the only minerals that are effectively applied through foliar application.
• Foliar application will not alleviate mineral deficiencies in roots or subsequent crown growth.
• Foliar spraying is only a temporary solution to the larger problem of soil nutrient availability.
• Minerals (especially micronutrients) applied in amounts that exceed a plant’s needs can injure or
kill the plant and contribute to environmental pollution.
• Any benefit from foliar spraying of landscape trees and shrubs is minor considering the cost and
labor required.
For more information, please visit Dr. Chalker-Scott’s web page at http://www.theinformedgardener.com.
andbonsai.com ~ andbonsai studio

Offline Mario

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Odg: Radite li vi folijarno prihranjivanje?!
« Odgovori #25 : 21-09-2009, 14:10:24 »
... jel!?!?... onda dobro  :turpija:

Offline Marija

Odg: Radite li vi folijarno prihranjivanje?!
« Odgovori #26 : 23-09-2009, 09:42:20 »
Mi nikada nismo ni radili folijarno ... ali dobro je znati  ;)
Pozdrav, Marija
https://meledabonsai.com/ | Meleda Bonsai

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Odg: Radite li vi folijarno prihranjivanje?!
« Odgovori #27 : 23-09-2009, 09:48:40 »
Mi nikada nismo ni radili folijarno ... ali dobro je znati  ;)

Ja sam vjerojatno bio najžešći aplikator folijarnog... u zadnje vrijeme ga smanjujem, no nisam odustao... igličavci to vole više od bjelogorice i igličavcima ću i dalje davati papicu na folijarnu stranu  :verycool:

Offline Ivan

Odg: Radite li vi folijarno prihranjivanje?!
« Odgovori #28 : 25-09-2009, 09:55:51 »
Na HBF ima još jedna tema o folijarnoj prihrani, ili sam nešto pomešao? (nije me bilo neko vreme ovde)
Uopšte neuredno prihranjujem moje biljke tako da ne mogu reći sa sigurnošću bilo šta.
Kada sam uzgajao palmatume iz semena (imao sam nekoliko hiljada sejanaca) probao sam sa folijarnom prihranom i bez nje. Biljke koje su bile tretirane sa Murtonikom su bile nekoliko puta naprednije (3-4 puta) nego one koje nisu. Zaključio sam da je folijarna prihrana dobra. Međutim, može biti da se rastvor murtonika dobrim delom prenosio i u supstrat (tresetni briketi Jiffy).
U međuvremenu sam malo kopao po internetu.
Zaključak je da osnovna prihrana treba da ide kroz zemljište, a folijarna prihrana kao dodatni način ishrane, prvenstveno mikroelementima i to u pravim koncentracijama, jer veće koncentracije mogu biti toksične?
Ove godine sam koristio Supstral štapiće za prihranu. Nije loše, ali izađe skupo.

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Odg: Radite li vi folijarno prihranjivanje?!
« Odgovori #29 : 25-09-2009, 10:05:34 »
...Zaključak je da osnovna prihrana treba da ide kroz zemljište, a folijarna prihrana kao dodatni način ishrane, prvenstveno mikroelementima i to u pravim koncentracijama, jer veće koncentracije mogu biti toksične?

S ovim zaključkom se definitivno slažem i dodao bi i folijarnu aplikaciju sredstva na bazi aminokiselina, što se kod mene pokazalo presudnim u rekuperaciji kolektiranih yamadoria.