Foliar Feeding DOES Work! The Science and Philosophy of Foliar Nutri7on Roch Gaussoin. PhD University of Nebraska Lincoln
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1 Foliar Feeding DOES Work! The Science and Philosophy of Foliar Nutri7on Roch Gaussoin. PhD University of Nebraska Lincoln 2013 Winter Seminar
2
3 What the heck is a turf specialist doing talking to a roomful of farmers?
4 Talking Points for Foliar Applica?ons can t jus5fy the cost no be<er than granular applica5ons no be<er than liquid applica5ons plants can not efficiently take nutrients thru their leaves Granulars/solubles have always been ok, why change?
5 Plant Nutrient Application! Ø Solid fertilizers! Ø Liquid fertilizers! Ø Organic fertilizers! Ø Inorganic fertilizers! Ø Foliar feeding! Ø Root feeding!
6 ! Nutrient absorption!!! Granular fertilizers!!- root absorption! Liquid fertilizers!!- root and foliar absorption! True foliar feeding!!-foliar (total or partial?)!!
7 Foliar Nutri?on Research: A historical perspec?ve
8 Foliar uptake is well documented
9
10 PERMEATION OF NUTRIENTS VIA CUTICULAR NANOPORES! MONOVALENT GREATER THAN DIVALENT IONS!! SMALL UNCHARGED MOLECULES MOVE READILY.!! HIGH CONCENTRATION MAY OVERCOME REPULSION!! PERMEATION GREATER WHEN NUTRIENTS ARE IN! SOLUTION THAN WHEN DRIED ON SURFACE.!!
11 DIAMETER OF HYDRATED CATIONS & CUTICULAR PENETRATION RATES! PERMEABILITY COEFFICIENTS OF CATIONS (k/k (Li + ) 0.5 M)!! K + > Na + > Mg +2 > Ca +2 >> Fe +3!! !! DIAMETER OF HYDRATED CATIONS (nm)!! ! McFarlane & Berry 1974! Mengel & Kirkby 1978! The rate of cuticular permeation decreases as hydration diameter! of monovalent cations (size) increases.!! For divalent cations, increased hydration weakens charge strength! and promotes greater permeation.! NH 4 + > K+ > Na+ > Ca 2 + > Mg 2 +!
12 Ectodesmata - pores with a diameter of less than 1 nm. These pores! are readily permeable to solutes such as urea (radii 0.44 nm),! but not larger molecules such as synthetic chelates.!
13 Grass Leaf Surface
14 NUTRIENT ABSORPTION INTO LEAF CELLS! NUTRIENTS ABSORBED THROUGH LEAVES ENTER THE! CELLULOSE CELL WALLS (APOPLASM) OF LEAVES! JUST AS IONS ABSORBED BY ROOTS AND TRANS-! PORTED THROUGH THE XYLEM WOULD.!! NUTRIENT IONS ARE ABSORBED BY LEAF CELL PROTO-! PLASTS JUST AS THEY WOULD BE BY ROOT CELLS.!! GRASSES DEFICIENT IN A NUTRIENT DO NOT ABSORB! IT THROUGH LEAVES MORE RAPIDLY THAN WOULD! NUTRIENT-SUFFICIENT PLANTS.!!
15 The first reports on foliar applica?on of mineral nutrients in plant produc?on date back to the second half of the 18th century most studies on the uptake of mineral nutrients and their transloca?on within a plant were carried out aler the Second World War (advent of radio isotopes)
16 The most studied foliar nutrient! is nitrogen -! 30 to 99% foliar absorbed!
17 Compara?ve nutrient recovery in crops - Nitrogen % Soil Applied % Foliar Applied 10 to 40 % sorghum & co<on 31 to 99 % tomato, corn & turfgrasses
18 Spray Solu?on Effects Concentra?on Increased uptake with increasing concentra?on may cause leaf injury Surfactants Beneficial to cri?cal ph Slightly acidic to neutral
19 Basic Concept Non- Root parts of plants will take up nutrients. Some types of ferglizers applied to the leaves of plants can be absorbed quickly and plengfully. Foliar absorbed nutrients are immediately available to the plant.
20 Why Foliar Feed? More control with less risk Lower overall nutrient inputs Less nutrient leaching past the root system resulgng in less potengal for groundwater contaminagon
21 Foliar Fer?liza?on Spoon Feeding Allows for congnuous adjustment of rates. Tank Mixing
22 Complexing and Chelating Agents Process removes the posigve charge from the metals, allowing the neutral or slightly negagvely charged, chelated molecule to slide through the pores on the leaf and root surface more rapidly. These pores are negagvely charged, so there is a problem with fixagon of posigvely charged minerals at the pore entrance. No barrier for the neutral mineral.
23 Complexing and Chelating Agents Organic Facilitators have the capacity of binding substangal amounts of metals and other cagons.
24 Liquid Products SyntheGc/inorganic forms Complexes Chelates
25 Synthetic Chelating Agents SyntheGc chelates used in ferglizer products: *EDTA *HEDTA *EGTA They are very popular and very effecgve when used in the soil. They only chelate the metals.
26 Complex When a metal ion combines with an electron donor, the resulgng substance is said to be a complex or a coordinagon compound. (CH3)- N- COO- metal
27 Chelate The main difference between a metal complex and a chelate is the donor atoms are a^ached to the metal and each other.
28 Form a very strong bond Amino Acid Chelate NH2 Amino Acid Chelate C C C NH2
29 Organic products used as complexing and chelagng agents: humic acids fulvic acids ligno sulfonates glucoheptanates derivagves from the wood pulp industry hydrolyzed protein mixes citric acid amino acids Some have low stability constants; tank mixing can be problemagc (precipitate)
30 Organic Agents * Advantage over non-organic degradable in the plant or soil provide an energy source to soil micro- organisms, which in turn helps make soil nutrients available to the plant. less phytotoxic
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