| Effects of water and nitrogen management on yield and water use efficiency of spring maize under shallow-buried drip irrigation |
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| DOI：10.7606/j.issn.1000-7601.2019.02.25 |
| Key Words: shallow-buried drip irrigation water and N management model spring maize yield water use efficiency semi-arid area of western Liaoning Province |
| Author Name | Affiliation | | LI Xue | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning 110016, China
University of Chinese Academy of Sciences, Beijing 100049, China | | YIN Guang-hua | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning 110016, China | | MA Ning-ning | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning 110016, China | | GU Jian | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning 110016, China
Liaoning Academy of Agricultural Sciences, Shenyang, Liaoning 110161, China | | WANG Shi-jie | Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang, Liaoning 110016, China
University of Chinese Academy of Sciences, Beijing 100049, China |
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| Abstract: |
| A two-factor quadratic saturation D-optimum design was used to carry out water and nitrogen precisely controlled experiment in a mobile shelter in semi-arid area of western Liaoning Province during 2016 to 2017. There were two factors, irrigation and nitrogen (N) applications. The irrigation rates were 145.4, 271.7, 348.2 and 436.2 mm, and the nitrogen application rates were 0, 84.6, 136.1 and 195.0 kg·hm-2, respectively, and there were totally 6 treatments. The effects of water and N interaction on yield and water use efficiency were analyzed and a regression model for yield was established. The results showed that the yield of spring maize increased to 11 005.60 kg·hm-2 with the increase in water when the irrigation quantity was between 145.4~350.5 mm, and it decreased to 10 730.09 kg·hm-2 with the increase of water when the irrigation quantity was 350.5~436.2 mm. When the amount of nitrogen was 0 to 146.9 kg·hm-2, the yield increased to 10 983.19 kg·hm-2 with the increase in N application. When the amount of N was 146.9 to 195.0 kg·hm-2, the yield reduced to 10 862.39 kg·hm-2 with the increase in N application. The effect of irrigation was greater than that of N application, there was an obvious positive interaction effect between the two factors, when the irrigation was 373.1 mm and the N application was 165.6 kg·hm-2, the yield reached the highest. Crop water consumptions were greater in the jointing-tasseling and the filling-harvesting periods, which were 115.64 mm and 127.50 mm, respectively. Water use efficiency decreased with the increase in irrigation, and decreased up to 52.21%. However, water use efficiency increased first and then decreased with the increase in N application, and it increased in 14.73%~20.08%. Treatment 6 (irrigation volume 348.2 mm, N application 195.0 kg·hm-2) was most conducive to the improvement of water use efficiency. Based on the results of both yield and water use efficiency, the suitable water-N application pattern for shallow-buried drip irrigation of spring maize was established and the optimum parameters of irrigation amount was 348.2 mm and N application rate was 165.6 kg·hm-2. |
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