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Effects of Zn Fertilizer Application Methods on Yield and Contents of N and Zn in Grains of Rice

GUO Jiu-xin;LIAO Wen-qiang;SUN Yu-ming;GUO Jun-jie;KONG Ya-li;SHI You-hua;XU Ai-qun;ZHANG Ju-cui;GUO Shi-wei;College of Resources and Environmental Sciences,Nanjing Agricultural University;Agriculture Bureau of Jiangle County;Rudong Station of Technical Guidance on Soil and Fertilizer;  
A field experiment was conducted to investigate the effects of Zn fertilizer application rate(0,15,30kg/hm2ZnSO4·7H2O)and application methods(soil,foliar)on the yield and Zn concentration in grains of Zhendao 11(a normal japonica rice variety)under low Zn(DTPA-Zn 0.84mg/kg)and borderline Zn deficient(DTPA-Zn 0.60mg/kg)soil in Rudong county,Jiangsu Province,respectively.The results showed that compared with control Zn fertilizer application could significantly improve the rice grain yield by about 0.3%-13.0%,with the yield increasing by rising Zn fertilizer rate,and the yield-improving efficiency of Zn fertilizer application in the borderline Zn deficient soil was higher than that in low Zn soil.In addition,application methods of Zn fertilizer also significantly affected grain yield and Zn content in individual rice organ.The yield-improving efficiency of soil application was higher than that of foliars spray,but the foliar spray of Zn fertilizer evidently increased Zn content in individual rice organ relative to the soil application of Zn fertilizer,and the effect of application method on Zn content followed a general trend as soil application+foliar sprayfoliar spraysoil applicationcontrol.Besides,It also indicated that the N concentration and accumulation were increased in rice organs by Zn fertilizer application,suggesting the interaction between N and Zn fertilizer on rice plant.To sum up,these results indicated that both yield and grain Zn nutrition quality could be facilitated by applying Zn fertilizer on soil combine with foliar spray in low Zn soil.
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