ADJUVANTS FOR PLANT GROWTH REGULATORS
Plant growth regulator compositions comprise an aqueous mixture of one or more plant growth regulators and one or more polyanionic polymers. The polymers contain at least about 80 mol percent of repeat units bearing at least one anionic functional group, the plant growth regulator being present at a level of up to about 6000 ppm. Preferably, the polymers contain respective amounts of maleic and itaconic repeat units.
1 . A composition comprising an aqueous mixture of a plant growth regulator and a polyanionic polymer, said polymer containing at least about 80 mol percent of repeat units bearing at least one anionic functional group, said plant growth regulator being present at a level of up to about 6000 ppm, and said composition having from about 85-99.75% by volume water.
2 . The composition of claim 1 , said plant growth regulator selected from the group consisting of antiauxins, auxins, cytokinins, defoliants, ethylene inhibitors, ethylene releasers, gametocides, gibberellins, growth inhibitors, growth retardants, growth stimulators, unclassified growth regulators, and mixtures thereof.
3 . The composition of claim 1 , said plant growth regulator comprising a plurality of different plant growth regulators.
4 . The composition of claim 1 , said polyanionic polymer including respective amounts of maleic and itaconic repeat units.
5 . The composition of claim 4 , said polymer comprising at least four repeat units distributed along the length of the polymer chain, said repeat units including at least one each of a maleic, itaconic, and sulfonate repeat unit.
6 . The composition of claim 4 , said polymer containing at least about 93% by weight of maleic and itaconic repeat units.
7 . The composition of claim 6 , said polymer consisting essentially of maleic and itaconic repeat units.
8 . The composition of claim 4 , said polymer including sulfonate repeat units.
9 . The composition of claim 8 , said polymer having from about 1-25% by weight of said sulfonate repeat units.
10 . The composition of claim 9 , said polymer having from about 1-70 mol percent of dicarboxylate repeat units derived from monomers of maleic acid and/or anhydride, humeric acid and/or anhydride, mesaconic acid and/or anhydride, from about 1-80 mol percent repeat units derived from itaconic acid and/or anhydride, and from about 1-65 mol percent of sulfonate repeat units possessing at least one carbon-carbon double bond and at least one sulfonate group.
11 . The composition of claim 1 , said composition further including a fertilizer.
12 . The composition of claim 1 , said composition being a dilutable concentrate and containing from about 1-15% by volume of said polymer.
13 . The composition of claim 12 , including from about 300-6000 ppm of said plant growth regulator.
14 . The composition of claim 1 , said composition being a use composition containing from about 0.1-5% by volume of said polymer.
15 . The composition of claim 14 , including from about 100-3000 ppm of said plant growth regulator.
16 . A method of regulating plant growth comprising the step of applying a composition in accordance with claim 1 to a plant seed, a growing plant, or to soil adjacent a planted seed or growing plant.
17 . A seed product comprising a plant seed in localized contact with a composition in accordance with claim 1 .