Abstract:

It’s to select a treatment of CRF which consumed less coating material but had better controlling effect to realize the purpose to reduce the cost of CRF. This paper studied the effects of granular diameter (D1=2.5-3 mm, D2=4-5 mm), the coating thickness (CTh1 = 50 g/m2, CTh2 = 70 g/m2) on biomass, nitrogen content, nitrogen use efficiency of maize, and fertilization efficiency of controlled release fertilizers (CRFs) by the pot experiment. The results showed that: granular diameter and coating thickness had significant influence on nitrogen content of maize in the first-crop and second-crop, and had little effect in the third-crop. Granular diameter and coating thickness had significant influence on nitrogen use efficiency of maize in single-crop and the cumulative three crops, but coating thickness treatment of nitrogen use efficiency was higher or significant higher than compound fertilizer treatment. Granular diameter had little effect on the biomass, big granular diameter can replace small granular. Coating thickness had significant influence on the biomass, compared with compound fertilizer treatment output was average increased 32.6%.