Nutrient Release Characteristics of Controlled-Release Compound Fertilizers and Their Effects on the Growth of Different Flowers
To investigate the nutrient release characteristics and effects on flower growth of polyurethane coated controlled-release compound fertilizers with coated mass fractions of 3%,4%,5%,and 6%,a nutrient release characteristic experiment and a pot experiment and leaching experiment are conducted using commercially available controlled-release compound fertilizer as control(CK)treatment,with Celosia cristata L.and Salvia japonica Thunb.as experimental subjects.The results show that with the increase of coated quantity,the nutrient release rate of polyurethane coated controlled-release compound fertilizer decreased,effectively prolonging the nutrient release period of the fertilizer.Compared with CK treatment,polyurethane coated controlled-release compound fertilizers with coated quantity of 4%and 5%significantly improved the plants fresh weight of Celosia cristata L.and Salvia japonica Thunb.,respectively.The conductivity(EC value)of the leaching solution treated with CK decreases continuously with time,while the EC value of the polyurethane coated controlled-release compound fertilizer leaching solution shows a trend of first increasing and then decreasing,which can effectively delay the loss of soil nutrients.Polyurethane coated controlled-release compound fertilizers with coated quantity of 4%to 5%can promote the growth of the tested flowers,effectively improve fertilizer utilization,and reduce environmental pollution.
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