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| DOI：10.13522/j.cnki.ggps.20190107 |
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| Study on Growth, Development and Water Consumption Characteristics of Winter Wheat under Different Yield Levels |
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HUANG Chao, LIU Zhandong, ZHAO Ben, ZHANG Kai, NING Dongfeng, QIN Anzhen, LI Sen
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1. Key Laboratory for Crop Water Requirement and Its Regulation, Ministry of Agriculture, Institute of Farmland Irrigation, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China;2. Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China
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| Abstract: |
| 【Objective】In this experiment, the yield of winter wheat was controlled by controlling the amount of fertilizer applied, and then the change of growth status and water consumption characteristics of winter wheat under different yield was understood, which provided a theoretical basis for the management of water use in the field and the formulation of the development strategy of high efficiency water use in regional agriculture. 【Method】We set four yield levels, including 7 500 kg/hm2(C0), 8 250 kg/hm2(C5), 9 000 kg/hm2(C10), 9 750 kg/hm2(C15), with no fertilization (CK) as control, the changes of leaf area index, dry matter accumulation, water consumption characteristics and water use efficiency of winter wheat under different yield were studied. 【Result】 With the increase of the target yield, the leaf area index of the winter wheat, the accumulated amount of dry matter before and after the flower, the increase of the biomass, the transfer of dry matter, the transfer rate of dry matter and the transfer of dry matter to the kernel gradually decreased, and the yield was basically the expected target. Compared with CK, the leaf area index, dry matter accumulation before and after anthesis and biomass of winter wheat treated with C15 increased by 52.6%, 25.9%, 112.6% and 51.2% respectively, while the dry matter transfer decreased by 44.7% on average, which indicated that dry matter synthesis in late stage of winter wheat played a major role in the formation of high grain yield. With the increase of target yield, water consumption of winter wheat increased and soil water content decreased, there was no significant difference in water use efficiency of winter wheat treated with C0, C5, C10 and C15 from 2016 to 2017, there were significant differences in water use efficiency of winter wheat in all treatments from 2017 to 2018, compared with CK treatment, C15 treatment increased winter wheat water consumption and water use efficiency by 29.7% and 28.5%, respectively. 【Conclusion】Higher leaf area index, dry matter accumulation and water consumption of winter wheat are the main reasons for high yield, and the synthesis of dry matter in later stage is the main reason for yield formation. At the same time, WUE of winter wheat increased significantly under high yield conditions. |
| Key words: winter wheat; dry matter; water consumption; water use efficiency; yield |
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