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《Journal of Triticeae Crops》 2015-01
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Effect of Foliar Application of Nitrogen Fertilizer on SPAD and Yield of Wheat

DONG Rui;L Houbo;ZHANG Baojun;ZHANG Zhengmao;CHEN Weitao;LIU Fangliang;College of Agronomy,Northwest A &F University;College of Food Science and Engineer,Northwest A&F University;  
The effect of foliar application of different concentrations of nitrogen fertilizer at heading,flowering and filling stages on SPAD grain filling characteristics and yield was evaluated in two wheat varieties(Nongda1108and Pubing79)under field experiment.The results showed that,the SPAD of two wheat varieties had significant differences between nitrogen fertilizer used and CK.The SPAD of two wheat was obviously increased and maintained for a longer period foliar application of 2.0%(H3)and 1.5%(H2)nitrogen fertilizer were used,it was increased foliar application of 1.0%(H1)nitrogen fertilizer were used,while it was reduced when foliar application of 2.5%(H4)and 3.0%(H5)nitrogen fertilizer were used.The SPAD of CK was on a decrease trend in the same period.The grain filling followed the"slow-fast-slow"change rules,The maximum grain filling rate(Vmax),the average grain filling rate(V)and the average grain filling rate(Vs)at the rapid increase periodof the treatments ofH1,H2 and H3were all higher than that of CK in both wheat cultivars.However,the Vmax,VandVs of the treatments of H4 and H5were less than that of CK.The time of the Vmaxof the treatments was earlier than that of CK.The time of the rapid increase period of all the treatments was shorter than that of CK.The thousand grain weight and grain number per spike and yield of two wheat varieies of different treatments showed the same order as H3H2H1CKH4H5.The foliar application of 2.0% nitrogen fertilizer could have the best effect on the yield of wheat.
【Fund】: 农业部公益性行业(农业)科研专项(200903007-06);; 西北农林科技大学农业科技推广基金项目
【CateGory Index】: S512.1
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