| The relationship between yield and water consumption of maize in Liaoning Province |
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| DOI：10.7606/j.issn.1000-7601.2018.01.36 |
| Key Words: maize water consumption water production function model relative leaf area index correction method yield forecasting |
| Author Name | Affiliation | | ZHANG Shu-jie | Institute of Atmospheric Environment, CMA, Shenyang, Liaoning 110166, China | | ZHOU Guang-sheng | Chinese Academy of Meteorological Sciences, Beijing 100081, China | | ZHANG Yu-shu | Institute of Atmospheric Environment, CMA, Shenyang, Liaoning 110166, China | | MI Na | Institute of Atmospheric Environment, CMA, Shenyang, Liaoning 110166, China | | MENG Ying | China meteorological Adminidtration training center of Liaoning, Shenyang, Liaoning 110166, China | | JI Rui-peng | Institute of Atmospheric Environment, CMA, Shenyang, Liaoning 110166, China | | CAI Fu | Institute of Atmospheric Environment, CMA, Shenyang, Liaoning 110166, China | | WU Jin-wen | Institute of Atmospheric Environment, CMA, Shenyang, Liaoning 110166, China | | LI Guang-xia | Liaoning Provincial Meteorological Observatory, Shenyang, Liaoning 110166, China |
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| Abstract: |
| To understand the effects of water conditions on yield of maize，the quantitative relationship between maize yield and water consumption was studied using the observation data of maize field experiments (sowing at different sowing dates) during 2011—2012 and 2014 in Jinzhou Agricultural Ecosystem Research Station, and those from 21 agrometeorological experimental stations from 1981 to 2010 in Liaoning province. The results showed that the relationship between yield and total water consumption of maize can be described by a quadratic curve equation (R2=0.793, F=105, P=0.0001, n=57). When water consumption reached 400～600 mm, the maximum yield of maize could be obtained. The order of water demand (from high to low) for different developmental stages of maize is tasseling to milk stage＞elongation to tasseling stage＞emergence to elongation stage＞milk to phsiology mature＞sowing to emergence, and the corresponding daily water consumption intensity is 5.75, 4.78, 2.36, 1.84 mm·d-1 and 1.35 mm·d-1, respectively. Based on the analysis of the relationship between relative leaf area index and relative crop coefficient, the correction method based on relative leaf area index for crop water stress coefficient was proposed. At the same time, maize water production function model was established on the basis of Jenson model. The accurate determination of water stress sensitivity index in this study provided reference for evaluation of the quantitative relationship between water consumption and yield of maize under drought stress. |
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