Effects of Fertilization and Sowing Rates on Weed Occurrence During the Seedling Stage and Yield of Water Direct Seeding Rice
A field experiment was conducted in Liuyang City,Hunan Province in 2021 to explore the effects of water management methods,nitrogen application rate,and sowing rate on direct seeding rice growth and development characteristics,yield,and weed occurrence in rice fields,using Zhuoliangyou 1126 as the experimental material.The experimental design was a split-split-plot arrangement,the main plots had different water management methods(W1,flooding;W2,wetting),the subplots had different nitrogen application rate(N0,0 kg/hm2;N1,150 kg/hm2;N2,195 kg/hm2)and sowing rate(D1,15.0 kg/hm2;D2,22.5 kg/hm2;D3,30.0 kg/hm2).The results showed that there was a significant difference in the total number of weeds under different water management treatments,while there was no significant difference in the total number of weeds under different nitrogen application rate treatments and sowing rate treatments.The rice yield of W1 treatment was 8.5 t/hm2,significantly higher than that of W2 treatment.The difference in average rice yield between N1 and N2 treatments was not significant,but both were significantly higher than the N0 treatment.The rice yield increased with the increase of sowing rate,but there was no significant difference between different sowing rate treatments.In summary,under the condition of submerged direct seeding of rice,the nitrogen application rate was 150 kg/hm2,the sowing rate was 15.0 kg/hm2,and weeding once during the 3-leaf and 1-heart stage could achieve rice yield increase while reducing the amount of herbicide used.
国家科技期刊平台
NSTL
万方数据
维普
