Dynamics of maize grain drying in the high latitude region of Northeast China
CHU Zhen-dong1, 2, 3*, MING Bo2*, LI Lu-lu2, XUE Jun2, ZHANG Wan-xu1, HOU Liang-yu1, 2, XIE Rui-zhi2, HOU Peng2, WANG Ke-ru2, LI Shao-kun1, 2
1 Agricultural College, Shihezi University/Key Laboratory of Oasis Eco-Agriculture, Xinjiang Production and Construction Crops, Shihezi 832000, P.R.China 2 Institute of Crop Sciences, Chinese Academy of Agricultural Sciences/Key Laboratory of Crop Physiology and Ecology, Ministry of Agriculture and Rural Affairs, Beijing 100081, P.R.China 3 Heilongjiang Bayi Agricultural University, Daqing 163000, P.R.China
Abstract A high grain moisture content at harvest has been an important problem in the high latitude region of Northeast China, and it is closely related to the genotypes of varieties, local meteorological factors and planting management. However, delayed harvest at a low temperature could not effectively reduce the grain moisture content. In this study, we continuously observed the grain drying during the late stage of different maturing types of maize varieties in Daqing, Heilongjiang Province, China in 2016 and 2017. A two-segment linear model was used to analyze the different stages of the drying processes: 1) Two-segment linear model fitting can divide the grain drying process of all varieties into two separate linear drying processes with different slopes. 2) During the rapid drying stage, the drying was faster at a higher temperature. The rate of slow drying was influenced by air vapor pressure. 3) The moisture content and meteorological factors when the drying rate turns from one stage into the other were not consistent between varieties and years. After entering the frost period, temperatures below 0°C will significantly reduce the rate of grain drying. 4) Due to the short growth period of early-maturing varieties, the drying time was prolonged, and the grain moisture content was lower than that of the mid-late maturing varieties. Local meteorological conditions do not allow the drying of mid-late maturing varieties to achieve a lower moisture content. When the temperature falls below 0°C, the drying rate of grain decreases markedly. Therefore, one feasible way to solve the problem of high moisture content is to replace the early-maturing varieties and implement the corresponding cultivation techniques.
Received: 02 March 2020
Accepted: 24 September 2020
Fund: This work was financially supported by the National Key Research and Development Program of China (2016YFD0300110), the National Natural Science Foundation of China (31971849), the China Agriculture Research System of MOF and MARA (CARS-02-25), and the Agricultural Science and Technology Innovation Program (CAAS-ZDRW202004).
About author: CHU Zhen-dong, E-mail: czdjym@163.com; MING Bo, E-mail: mingbo@caas.cn; Correspondence LI Shao-kun, Tel/Fax: +86-10-82108891, E-mail: lishaokun@caas.cn; WANG Ke-ru, Tel: +86-10-82108595, Fax: +86-10-82108891, E-mail: wangkeru@caas.cn
* These authors contributed equally to this study.
CHU Zhen-dong, MING Bo LI Lu-lu, XUE Jun, ZHANG Wan-xu, HOU Liang-yu, XIE Rui-zhi, HOU Peng, WANG Ke-ru, LI Shao-kun .
2022.
Dynamics of maize grain drying in the high latitude region of Northeast China. Journal of Integrative Agriculture, 21(2): 365-374.
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