☆ 4.7 Article

Influence of climate change and mechanized harvesting on maize (Zea mays L.) planting and northern limits in northeast China

JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE (2021)

Journal

JOURNAL OF THE SCIENCE OF FOOD AND AGRICULTURE

Volume 101, Issue 9, Pages 3889-3897

Publisher

WILEY

DOI: 10.1002/jsfa.11027

Keywords

northeast China; mechanical kernel harvesting maize; northern limits; climate change

Funding

National Key Research and Development Program of China [2016YFD0300201]

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Abstract

The study found that the average temperature during the maize growth period increased at a rate of 0.22 degrees C/10a from 1960 to 2018. The growth periods and accumulated temperatures for different types of maize were identified, and the northern limits for planting were compared between common harvest maize and mechanical kernel harvesting maize.

BACKGROUND: Northeast China is one of the most important maize producing areas in China. Due to limitations on crop growth resulting from temperature, whether this area can realize mechanical kernel harvesting maize (MKHM) will directly affect the stable development of maize in the region. The effects of climate change on the northern limits of early maturing MKHM were also analyzed in the study. RESULTS: The mean temperature during the maize growth period increased at a rate of 0.22 degrees C/10a from 1960 to 2018. The average growth periods for early, middle- and late-maturing common harvest maize (CHM) were 123, 135, and 140 days, respectively, and the accumulated temperature above 10 degrees C (AAT10) was 2400 degrees C, 2800 degrees C, and 3100 degrees C. The early maturing MKHM growth period was about 20 days longer than that of early maturing CHM, and thus the AAT10 of the MKHM was 2700 degrees C. From 2000-2018, the northern limits for the early maturing CHM maize planting were located from south of Nenjiang and Wudalianchi (47 degrees 98 ' N-49 degrees 74 ' N), while the northern limits for the early maturing MKHM maize were located in south Keshan, Nehe, and Hailun (46 degrees 32 ' N-48 degrees 70 ' N), which was about 148 km southward compared to the northern limits of the early maturing CHM maize. CONCLUSION: This study not only confirmed the northern limits of early maturing MKHM maize but also indicated that the development of MKHM offsets the influences of climate change on the northern limits of maize planting. This is very important for the sustainable development of maize in the region. (c) 2020 Society of Chemical Industry

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Evaluation of maize varieties for mechanical grain harvesting in mid-latitude region, China

Zhentao Zhang, Bo Ming, Hongwei Liang, Zhaofu Huang, Keru Wang, Xiaoguang Yang, Zhigang Wang, Ruizhi Xie, Peng Hou, Ruixia Zhao, Shaokun Li

Summary: This study investigated the allocation of heat resources during yield formation and grains drying in maize production in China. Three production scenarios were established, with results showing that low-moisture grain harvest led to higher production loss compared to traditional production, while mid-moisture grain harvest could achieve slight production increases. Adjusting varieties and layout can improve grain drying rate and promote mechanical harvesting, but further research is needed to reduce GMC to 20% at harvest.

AGRONOMY JOURNAL (2021)