ADDITIVE AND SYNERGISTIC EFFECTS ON PLANT GROWTH FROM POLYMERS AND ORGANIC MATTER APPLIED TO SOIL SIMULTANEOUSLY

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Abstract
We tested the effect of applying to soil combinations of organic sources and an anionic polyacrylamide and both singly on emergence and growth of tomato and wheat plants. The interactions were generally additive and synergistic. The organic sources and polyacrylamide often had a sparing effect on the need for the other. In one test with an organic source high in N (6%), there was a negative interaction on growth of tomato plants between the polyacrylamide and the organic source. In a test in which the polyacrylamide was applied to soil in solution with a high application of composted manure, the interaction on growth of tomato seedlings was additive. Maximum response for tomatoes for soils low in soil organic matter to polyacrylamide was obtained for low (224 kg ha-1) rather than high (448 and 1120 kg ha-1) application levels with or without addition of other organics. Interactions between polyacrylamide and organics on plant growth varied with soil characteristics. We tested the effect of applying to soil combinations of organic sources and an anionic polyacrylamide and both singly on emergence and growth of tomato and wheat plants. The interactions were generally additive and synergistic. The organic sources and polyacrylamide often had a sparing effect on the need for the other. In one test with an organic source high in N (6%), there was a negative interaction on growth of tomato plants between the polyacrylamide and the organic source. In a test in which the polyacrylamide was applied to soil in solution with a high application of composted manure, the interaction on growth of tomato seedlings was additive. Maximum response for tomatoes for soils low in soil organic matter to polyacrylamide was obtained for low (224 kg ha-1) rather than high (448 and 1120 kg ha-1) application levels with or without addition of other organics. Interactions between polyacrylamide and organics on plant growth varied with soil characteristics. © Williams & Wilkins 1986. All Rights Reserved.

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