Research on Grain Filling Characteristics of Different Nitrogen Efficiency Genotypes of Maize

L(U) Jingyao; SHEN Lixia; CHAO Xiaole

doi:10.15933/j.cnki.1004-3268.2017.01.002

Abstract：In order to guide the application of nitrogen fertilizer,the difference of grain filling characteristics of different nitrogen efficiency genotypes of maize was explored.Under field experiment condition,Tunyu 99,Luyu 19 and Xianyu 335 were used as the test materials,four application levels of nitrogen were designed,which were 0 (N0),80 (N1),160 (N2),240 (N3) kg/ha,the maize grain dry weight and fresh weight after pollination were measured,the relationship of tine after pollination time,grain dry weight,moisture content and filling rate were discussed using regression analysis.The results showed that the dry kernels quality growth rate peak inflection point of different parts of different varieties appeared at different time,Tunyu 99,Luyu 19 and Xianyu 335 gained inflection point appeared most early in N3,N1and N2 treatment,and Tunyu 99 grain inflection point appeared most earlycompared with Luyu 19 and Xianyu 33,the increase of dry matter accumulation of Tunyu 99 was the most quickly.The grain moisture content of Tunyu 99 and Xianyu 335 decreased most quickly under N3,N2 treatment,respectively,the moisture content of Luyu 19 decreased most rapidly under N1 treatment.The peak value of grain filling rate of Tunyu 99 and Luyu 19 appeared on 25-30 d after pollination,which of Xianyu 335 appeared on 20-25 d after pollination.The top and middle lower grain were different in dry weight,water content and grain filling rate,but the optimal nitrogen application rate of grain dry weight and grain filling rate of three maize varieties was consistent with the nitrogen application of the highest yield.The final yields of three maize varieties were closely related to the characteristics of nitrogen efficiency.