Relationship and Distribution of In-Field Dry-Down and Equilibrium in Maize Grain Moisture Content

文献类型： 外文期刊

第一作者： Gao, Shang

作者： Gao, Shang;Ming, Bo;Li, Lu-lu;Yin, Xue-bo;Xue, Jun;Wang, Ke-ru;Xie, Rui-zhi;Li, Shao-kun

作者机构：

关键词： Maize (Zea mays L.); grain dry-down; equilibrium moisture content; regional distribution; GAB model

期刊名称：AGRICULTURAL AND FOREST METEOROLOGY （ 影响因子：5.734； 五年影响因子：5.964 ）

ISSN： 0168-1923

年卷期： 2021 年 304 卷

页码：

收录情况： SCI

摘要： Y The selection of the appropriate harvest time and moisture content (MC) is very important for maize (Zea Mays L.) production, and selection is an essential step that balances the yield and comprehensive benefits. In this study, the process and final MC following a grain dry-down of sixteen maize hybrids was observed in 2017 and 2018. The Guggenheim-Anderson-de Boer (GAB) model, which is commonly used to describe the equilibrium moisture content (M-eq) under controlled conditions, was used to evaluate the relationship between the field M-eq and the final MC. The results showed that the MC reached a stable level after a long dry-down period in the field, indicating that an equilibrium was present between the grain and the atmosphere. The MC at the equilibrium state represented two characteristics, a "hysteresis effect" and a "convergence effect", which were as follows: the change in MC always lagged behind the M-eq in the atmosphere; and the MC fluctuated continuously with the M-eq but could not reach its limit. The time of the "hysteresis effect" was estimated to be approximately 2-4 days. The time to reach equilibrium varied greatly in different maize hybrids, and it was related to the growth period and dry-down characteristics. Moreover, the various climatic types contributed to diverse M-eq values, and the humid climate had a higher Meq than the dry-cold climate. The distribution of M-eq values and the drying days on which the maize grain moisture content decreased from 30% to 25% (and 20%), guided the threshold for the delayed harvest of maize, as also estimated in various maize ecological areas in China. The optimal harvest time were significantly different in various regions due to different M-eq values. Therefore, we suggest that the estimation of the M-eq could be an important indicator for predicting the grain dry-down and harvest management strategies for a region.

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