Crops ›› 2018, Vol. 34 ›› Issue (6): 17-21.doi: 10.16035/j.issn.1001-7283.2018.06.003

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Researches on Maize Grain Dehydration and Countermeasures for Mechanical Grain Harvesting

Ming Bo,Wang Keru,Xie Ruizhi,Hou Peng,Li Shaokun   

  1. Institute of Crop Sciences, Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Physiology and Ecology, Ministry of Agriculture and Rural Affairs, Beijing 100081, China
  • Received:2018-05-23 Revised:2018-09-14 Online:2018-12-15 Published:2018-12-06

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Abstract:

Maize production areas in China have large spans and diverse ecological types, and most of the grain moisture content at harvest stage are on the high level, affecting the quality of grain mechanical harvesting, which is the critical factor that limiting the technical promotion and application of mechanical grain harvesting in China. According to the current studies, the grain dehydration process includes two stages physiological dehydration and natural dehydration. The main controlling factors of dehydration rate in each stage are different leading to a significant difference in dehydration characteristics of maize grain among inter-regional, inter-species and inter-annual. It is difficult to support the formulation of technical measures and supportive policies because of the unclear physiological and ecological mechanisms affected by the dynamic characteristics of maize grain dehydration. This study proposes that the ecological networking experiment on dehydration characteristics of maize grain and their influencing factors, will be conducted in the four major maize producing regions including Huang-huai-hai plain, northeast, northwest and southwest maize region in China. The objective of this experiment is to identify the main controlling ecological factors and physiological ecological mechanism affecting grain dehydration dynamic process. With the theory as the guidance, the coordinated relationship between the grain maturity and the reduction of moisture content as the focus, the regional heat resources are fully utilized to achieve the stable yield and grain mechanical harvesting. By measures such as adjustments to local conditions, integrated use of grain variety breeding, variety maturity period configuration, harvest decision, a complete set of cultivation techniques and supporting policies can be administered tolook for a breakthrough of regional grain mechanical harvesting technology.

Key words: Maize, Mechanical grain harvesting, Regional disparity, Grain dehydration, Eco-physiological mechanism

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