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Relationship of Milk Line Position with Grain Weight and mechanized harvest of Summer Corn

Agricultural Science & Technology 2017年第10期18卷 1841-1844,1851页

作者： Yan MENG Xiyun SUN Fanyu MENG Guangyuan LU Qianqian HOU Shangqiu Academy of Agriculture and Forestry Sciences Shangqiu 476000 China

To investigate the relationship of milk line position with grain weight and mechanized harvest of summer corn in Huang-Huai-Hai Region, 8 varieties （A, B, C, D, E, F, G, H） with large planting areas were selected to measure the grain filling rate, 100-grain weight, water content and milk line position, and the correlation was analyzed. Results showed that when the milk line position was 90%, the grain filling of all the 8 varieties finished and 100-grain weight reached the highest value, which was 43.02 g. The grain filling time was in positive correlation with 100-grain weight. However, when the milk line position completely disappeared, the 100-grain weight was reduced by 8.66% at most. There was no significant difference during the periods of grain weight rising, but in the periods of grain weight falling, the traits of D, E, H were significantly different with the other varieties, and water loss rate of C and A showed significant difference with the other six varieties. The water content of grain was negatively correlated with milk line position. When the milk line percentage was 90% , the grain water content was less than 30% . The key factor influencing the mechanized harvest of summer corn is harvesting time, rather than the varieties. Moreover, milk-line position of 90% is the best time for harvest; if the harvest is too late, the yield will be reduced with varying degrees.

关键词： Maize Grain filling rate 100-grain weight Milk line position mechanized harvest

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

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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, Pmechanized 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, Pmechanized grain harvest.

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

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