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| Response of drip-irrigated spring maize to different irrigation decision-making methods in Hexi region |
| YANG Rui, FAN Junliang*, LAI Zhenlin, XU Xinyu |
| Key Laboratory of Agricultural Soil and Water Engineering in Arid and Semiarid Areas, Ministry of Education, Northwest A & F University, Yangling, Shaanxi 712100, China |
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Abstract Based on three irrigation decision-making methods(soil moisture, evapotranspiration, soil water potential), ten irrigation treatments(CK,W1,W2,EP100,EP80,EF100,EF80,P25,P45,P65)were designed to study the effects of different irrigation decision-making methods on the growth, grain yield, water and nitrogen use efficiency of spring maize. The results showed that the highest grain yield was obtained by CK, EP100 and P25 under the soil moisture, evapotranspiration and soil water potential based irrigation methods, respectively. The yield of CK was 6.90% and 8.28% higher than that of EP100 and P25, respectively. The growth and dry matter accumulation of spring maize were highest under CK, but its water consumption was largest(718.54 mm), which was 26.13% and 11.57% higher than that of EP100 and P25, respectively. The yield of EP100 was significantly lower than that of CK, while its water use efficiency was significantly higher than that of CK. The P25 treatment had irrigation times than CK and E100 treatments, and its performances in yield and water use efficiency were not outstanding. There was no significant difference in maize yield and water use efficiency between EP80 and EP100. Comprehensively considering the yield, water use efficiency, and the applicability of the methods, it was believed that the irrigation decision-making method based on past evapotranspiration with weekly irrigation quota of 80%ET0(EP80)was the most suitable irrigation decision-making method for efficient and stable spring maize production in the Hexi Region.
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Received: 28 April 2021
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