Effects of Nitrogen Reduction and Side Deep Application of Controlled-release Blend Fertilizer on Grain Yield,Quality and Nitrogen Absorption and Utilization of Japonica Rice'Nanjing 5055'
To study the effects of nitrogen reduction and side deep application of controlled-release blend fertilizer on rice yield,quality and nitrogen absorption and utilization,local japonica rice cultivar'Nanjing 5055'was selected as the material,four treatments were set up in paddy fields,including no nitrogen fertilizer(0N),local conventional fertilizer(CK),one-time side deep application of controlled-release blend fertilizer(S1)and side deep application of controlled-release blend fertilizer and top application of available nitrogen fertilizer(S2),the experiments were carried out in Dongchen Town and Baipu Town of Rugao City,respectively.Meanwhile,the total nitrogen fertilizer rate of S1 and S2 were both reduced by 25％than CK.The results of two experimental locations showed that both S1 and S2 could improve the appearance,cooking and eating quality of rice compared with CK,but the grain yield and total nitrogen uptake were reduced by an average of 5.12％,1.27％and 9.53％,2.77％,respectively.The grain yield of S1 was significantly decreased due to a significant reduction in its spikelets per panicle,while there was no significant difference between S2 and CK.Besides,the recovery efficiency,agronomic efficiency and partial factor productivity of nitrogen fertilizer were all greatly increased under S2.Our results indicate that,when the total nitrogen fertilizer rate is drastically reduced,it is more beneficial to realizing green,high quality and efficient production of rice by applying the pattern of S2.
ricenitrogen reductionside deep application of controlled-release blend fertilizeryieldquality
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