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| DOI：10.13522/j.cnki.ggps.2019384 |
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| Regulating Water and Fertilizer Application in Film-mulched Drip Irrigation to Improve Growth and Water - Fertilizer Utilization of Maize in Western Jilin |
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SUN Yunyun, LIU Fangming, GAO Yushan, HOU Zhonghua, DOU Jingang, LIU Huitao
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Institute of Agricultural Resources and Environment, Jilin Academy of Agricultural Sciences, Changchun 130033, China
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| Abstract: |
| 【Background】Maize is a staple crop and its sustainable production is critical to food security in China. The areas with maize cultivation in the semi-arid regions in western Jilin province are approximately 800,000 hectares, but its yield is low due to the combined impact of drought and low utilization efficiency of water and fertilizer. It is hence important to study the mechanisms underlying water-nitrogen coupling, its consequent impact on yield, as well as the use efficiency of both water and nitrogen in these regions.【Objective】Considering aridity, soil degradation, low water and fertilizer use efficiency in western Jilin province, this work investigated the combined effects of different water and fertilizer couplings on growth, biomass accumulation, yield and yield composition of maize under film-mulched drip irrigation, in attempts to provide a guidance for increasing water and fertilizer use efficiency in maize production in western Jilin province.【Method】The experiment was carried out at a filed in the Qian Experimental Station of Jilin Academy of Agricultural Sciences. We compared three irrigations: 350 mm, 500 mm and 650 mm, and four nitrogen fertilizer applications: 0 kg/hm2, 120 kg/hm2, 240 kg/hm2 and 360 kg/hm2. In each treatment, we measured plant height, leaf area index and yield of the maize. 【Result】The water and nitrogen interacted positively in promoting plant height, leaf area index and yield of the maize to some extents. Increasing nitrogen fertilizer did not necessarily lead to an increase in yield as under water stress, increasing nitrogen application over a critical level inhibited plant growth thereby reducing water and fertilizer use efficiency. The W2+N3 gave the highest yield, increasing by 3.7%~49.7% compared with other treatments; it also had the highest fertilizer agronomic efficiency, up 0.82~10.28 kg/kg compared to other treatments.【Conclusion】Considering both yield and resource use efficiency, the optimal water and fertilizer applications for maize under film-mulched drip irrigation in western Jilin province was 500~575 mm and 240~300 kg/hm2 respectively. |
| Key words: drip irrigation; water and nitrogen; maize; yield; water and fertilizer utilization efficiency |
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