Effects of controlled-release urea releasing period on rice yield and nitro-gen fertilizer utilization
To investigate the effects of controlled-release urea with different release periods on rice yield formation and nitrogen utilization,the rice variety Nanjing 9108 was used as the experimental material in this study,and the total nitrogen application rate was 270 kg/hm2.The experiment included six treatments:no nitrogen fertilizer(N0),a control treatment u-sing conventional urea(CK),and four controlled-release urea treatments with release periods of 60 d,80 d,100 d,and 120 d(T1,T2,T3,and T4,respectively).The study aimed to explore the impact of these treatments on rice yield,tiller number,dry matter accumulation,and nitrogen utilization efficiency.The results showed that compared with CK,the yield of rice treated with common urea and controlled-re-lease urea was significantly increased.The treatment of common urea combined with controlled-release urea with suitable releasing period could increase the number of tillers and leaf area index of rice plants,promote the accumulation of dry matter and nitrogen,and obtain higher seed setting rate.Compared with the controlled-release urea with a release period of 120 d,the nitrogen release amount of the controlled-release urea with a release period of 100 d was more suitable for the nitrogen amount required by rice at different growth and development stages,and the nitrogen fertilizer utilization rate was higher.It can be seen that ordinary urea combined with con-trolled-release urea with appropriate release period can improve rice yield and nitrogen utilization rate.
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