Comparison of powdery and granular forms of phosphorus-sulphur fertilizers prepared on the base of ground phosphate rock in terms on the environment impact

摘要

Ground phosphate rock was used as a PS fertilizer in powdery and granular form (P:S ratio 10:1) for growing oats, lupine and maize in field expts. The soil pH, contents of available P and S in the soil and the concn. of phosphate(V) and the sulfate(VI) ions in water filtrate were detd. Use of the granular fertilizers resulted in minor and less rapid changes in soil and water in comparison with the powdery one.