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grain dehydration rate is related to post-silking thermal time and ear characters in different maize hybrids

Journal of Integrative Agriculture 2022年第4期21卷 964-976页

作者： SHI Wen-jun SHAO Hui SHA Ye SHI Rong SHI Dong-feng CHEN Ya-chao BAN Xiang-ben MI Guo-hua The Key Lab of Plant–Soil Interaction Ministry of Education/National Academy of Agriculture Green Development/College of Resources and Environmental ScienceChina Agricultural UniversityBeijing 100193P.R.China

Mechanized grain harvest of maize becomes increasingly important with growing land plot size in Northeast China. grain moisture is an important factor affecting the performance of mechanized grain harvest. However, it remains unclear what influences grain dehydration rate. In this study, maize grain dehydrating process was investigated in a two-year field experiment with five hybrids under two planting densities in 2017 and 2018. It was found that damaged-grain ratio was the main factor affecting mechanized harvest quality, and this ratio was positively correlated with grain moisture content at harvest(R^(2)=0.6372, Pgrain ratio for mechanized grain harvest, the optimal maize grain moisture content was 22.3%. From silking to physiological maturity, grain dehydrating process was mostly dependent on the thermal time(growing degree days, GDDs)(r=-0.9412, Pgrain moisture content at physiological maturity was 29.4%. Thereafter, the linear relationship between GDDs and grain moisture still existed, but the correlation coefficient became smaller(r=-0.8267, Pgrain dehydrating process was greatly affected by genotypes. grain dehydrated faster when a hybrid has a smaller husk area(r=0.6591, Pgrain harvest.

关键词： maize grain moisture grain dehydrating grain damage mechanized harvest ear traits genotype

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