| Construction and verification of characteristic curve of lodging type in key growth stages of summer maize |
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| DOI：10.7606/j.issn.1000-7601.2021.06.28 |
| Key Words: summer maize lodging type characteristic curve piecewise fitting model |
| Author Name | Affiliation | | LI Shuyan | China Meteorological Administration·Henan Key Laboratory of Agrometeorological Support and Applied Technique, Zhengzhou, Henan 450003, China
Henan Institute of Meteorological Sciences, Zhengzhou, Henan 450003, China | | LI Junling | China Meteorological Administration·Henan Key Laboratory of Agrometeorological Support and Applied Technique, Zhengzhou, Henan 450003, China
Henan Institute of Meteorological Sciences, Zhengzhou, Henan 450003, China | | MA Zhihong | China Meteorological Administration·Henan Key Laboratory of Agrometeorological Support and Applied Technique, Zhengzhou, Henan 450003, China
Henan Institute of Meteorological Sciences, Zhengzhou, Henan 450003, China | | WEI Qingwei | Hebi Meteorological Bureau, Hebi, Henan 458000, China | | REN Liwei | Hebi Meteorological Bureau, Hebi, Henan 458000, China |
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| Abstract: |
| The yield loss of maize caused by different types of lodging is very different. Therefore, it is the basis for carrying out studies on lodging disasters to clarify the types of lodging. In the study, lodging types were divided into two types: “root lodging” and “stem lodging”. The characteristic curve of lodging types during the whole growth period was initially constructed, using the data of 12 typical disaster years from the maize variety regional trials in Hebi city during 2003 to 2019. In addition, based on the results of the lodging survey data in Nanyang city in 2013, the characteristics of lodging types before and after the booting period were analyzed. The initially constructed lodging type characteristic curve was revised in sections of “before booting” and “after booting”, and a piecewise linear model of lodging type was established. In order to facilitate practical application, a new data sequence was constructed using simulation results of the piecewise linear model, and a cubic polynomial fitting was performed on it to establish a comprehensive curve model in main developmental stages. The result showed, lodging generally occurred 45 to 97 days after sowing, and the occurrence of lodging on 45 to 55 days after sowing was more concentrated, which was close to half of the total disaster year samples. The average tasseling period of summer maize was 53 days after sowing. If lodging occurred before tasseling, “root lodging” was the dominant type. The average proportion of root lodging in disaster years was 85.1%, and it increased significantly with the increase in the number of growth days. After tasseling, the proportion of root lodging decreased significantly with the postponement of growth period, and the proportion of stem lodging increased significantly. Stem lodging happened around the mature period. Using historical typical lodging cases and disaster picture information to verify the constructed piecewise linear and comprehensive curve models, the average simulation errors of the piecewise linear model and the comprehensive curve model were 11.9% and 11.1%, respectively. |
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