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| Field plot experiment on water production function of winter wheat in wide ridge and furrow irrigation |
| WANG Shunsheng, LI Huanhuan, WANG Kangsan, LIU Dongxin |
| School of Water Conservancy, North China University of Water Resources and Electric Power, Zhengzhou, Henan 450045, China |
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Abstract In the paper, effects of drought in different growth periods on yield, water consumption and water use efficiency as well as water production function are studied based on a series of field plot experiments. The results show that the later the drought, the lower the yield of winter wheat. The highest yield is 6 805.12 kg/hm2 when a light drought happens in sowing and jointing stages, and the lowest yield is 5 986.50 kg/hm2 if a severe drought occurs in flowering and ripening stages. The later the drought, the lower the water consumption of winter wheat. The maximum water consumption is 4 260.3 m3/hm2 for a light drought in sowing and jointing stages, and the minimum consumption is 3418.6 m3/hm2 for a severe drought in heading and flowering stages. The maximum water use efficiency of winter wheat is 1.86 kg/m3 for a light drought in jointing—heading stages, and the minimum is 1.57 kg/m3 for a severe drought in sowing and jointing stages. The total yield of winter wheat is a parabolic function of total water consumption with a correlation coefficient of 0.966 7, which is significant in statistics. The suitable water consumption of winter wheat is 356-424 mm in furrow irrigation. A Jensen water production function model of winter wheat is obtained for field in Zhengzhou, Henan Province. The water sensitive index decreases steadily from heading—flowering to jointing—heading, flowering—maturing, reviving—jointing, sowing—overwintering, and overwintering—reviving periods.
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Received: 17 June 2016
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