Difference Analysis of Grain Filling and Dehydration Characteristics of Different Maize Varieties
In the Huang-Huai-Hai region,the problems such as high grain moisture content and poor grain harvest quality were prominent during the summer maize harvest period,which have become the bottle-neck of maize mechanization development in this region.The purpose of this study was to provide a theoretical basis for selection and popularization of maize varieties suitable for mechanized grain harvest by studying the differences in grain filling and dehydration characteristics among different summer maize varieties.Dika 517(DK517),Jingnongke 728(JNK728)and Zhengdan 958(ZD958)were used as test materials.The indica-tors such as grain filling process parameters,dehydration parameters and yield were analyzed.The results showed that the 100-grain weight of JNK728 was higher than that of DK517 and ZD958 at grain filling stage,and the increase amplitude reached 31.79％and 22.33％respectively at physiological maturity stage.Com-pared with ZD958,the two-year average of filling starting potential(R0)of DK517 and JNK728 increased by 89.71％and 69.12％,and that of the filling active stage(P)increased by 21.62％and 21.83％.The grain moisture content of DK517 was always lower than that of JNK728 and ZD958,and it was 33.12％and 25.69％lower than that of JNK728 and ZD958 at physiological maturity stage.The two-year average value of total dehy-dration rate and average dehydration rate after physiological maturity of DK517 were 5.62％and 7.15％,and 60.74％and 47.49％higher than JNK728 and ZD958,respectively.Correlation analysis results showed that there were very significantly or significantly positive correlation between average grain dehydration rate after physiological maturity and total grain dehydration rate.In 2020,the yield of DK517 was the highest as 10 275 kg/hm2,which was 14.17％and 23.38％higher than that of ZD958 and JNK728.Compared with ZD958,the yield of JNK728 and DK517 increased by 22.53％and 10.96％in 2021.The average yield of the two years showed as DK517>JNK728>ZD958.In conclusion,the grain-harvesting varieties DK517 and JNK728 had characteristics as longer grain filling activity period,higher grain filling initiation potential,and higher total grain dehydration rate.The average dehydration rate of DK517 was faster both at pre-and post-physiological maturity stage,while that of JNK728 was mainly at pre-physiological maturity stage.
万方数据
维普
