Micronutrient delivery systems using hydrophilic polyacrylamides

Details Micronutrient delivery systems using hydrophilic polyacrylamides Micronutrient delivery systems using hydrophilic polyacrylamides

1991-09-19

1993-06-22

Robinson, Allen J.

Chemistry: fertilizers

Processes and products

Inorganic material

71 58, 71DIG1, 71 6409, 71 27, C05D 902, C05C 500, C05G 304

Patent

active

052213137

ABSTRACT:
Inclusion of certain hydrophilic organic gel-forming polymers, notably polyacrylamides, with relatively inexpensive soluble iron sulfate [FeSO.sub.4 or Fe.sub.2 (SO.sub.4).sub.3 ] significantly improves the efficiency of iron source fertilizer materials for iron-sensitive plants growing on iron-deficient soils and can maintain supply of available iron to growing plants for periods up to about 12 weeks. These polymers may be mixed with iron-containing solutions to form suitable gels which are band applied in or near the seed row at or prior to planting or spot placed in the root zone of growing plants in soil. Other soluble fertilizers of micronutrients such as copper, manganese, or zinc also may be included instead of, or with, iron sulfates in hydrogels of these polymers. Hydrogels provide a unique environment which restricts contact of soluble iron fertilizers with the soil, thereby minimizing the extent of chemical reactions with the soil that reduce the availability of the applied micronutrients to plant roots. Root penetration also is greater in hydrogels than in the soil matrix so root density is greater in the banded or spot-placed gel, resulting in greater uptake efficiency of applied micronutrient.

REFERENCES:
patent: 4396412 (1983-08-01), Heller et al.
patent: 4583320 (1986-04-01), Redenbaugh

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