We grew tomato, cotton, and lettuce seedlings in containers in a glasshouse in various soils with different combinations of a polyacrylamide and a polysaccharide as soil conditioners. In some tests all soil conditioners were applied in solution, and in other tests part was applied in solution and part mixed dry into soil. The conditioners increased rate of emergence and dry weights of seedlings. Results were similar to those for Krilium over 30 years ago, but application rates for the soil conditioners used in this study were much smaller.
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Wallace et al. (1986) studied this question.