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| DOI：10.13522/j.cnki.ggps.2025046 |
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| Combined effects of reducing nitrogen fertilizer application and drip irrigation on yield and economic benefit of maize production |
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Wang Jiaqi, Zhang Shuhong, Liu Yanmei, Liu Zhenying, Lin Yingshuo,
Fang Tiantian, Wen Guangchao, Hu Zebin, Ren Rongkui
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Henan Xinlianxin Chemical Industry Group Co., LTD., Xinxiang 453700, China
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| Abstract: |
| 【Objective】Excessive nitrogen application is often adopted by farmers as an insurance practice in maize production in the Huang-Huai-Hai region of China, which constitutes a major cause of agricultural non-point source pollution. To optimize nitrogen management, this study explored the combined effects of nitrogen reduction and drip irrigation on maize agronomic traits, yield and economic benefits, aiming to establish a rational nitrogen fertilization strategy for sustainable maize production in this region.【Method】The field experiment consisted of five treatments: conventional fertilization (CK, 270 kg/hm2) and irrigation, drip irrigation with conventional nitrogen fertilization (T1), drip irrigation with 15% nitrogen reduction (T2, 229.5 kg/hm2), 30% nitrogen reduction (T3, 190.5 kg/hm2), and 45% nitrogen reduction (T4, 148.5 kg/hm2), compared to T1. In each treatment, we measured the agronomic traits, leaf area index, dynamic dry matter accumulation, yield components and economic benefits of the maize at its key growth stages.【Result】Reducing 15% nitrogen application did not have an adverse effect on maize growth and development. However, reducing 30% or more nitrogen application led to significant declines in maize yield, ear length, rows per ear and kernels per row, and notably increased the bare tip length; it also reduced the leaf area index during the middle and late growth stages and dry matter accumulation, compared with T1. Reducing 15% nitrogen application gave the highest net income, 81.0-2 433.0 yuan/hm2 higher than other treatments.【Conclusion】Comprehensive analysis showed that reducing nitrogen application from 270 kg/hm2 to 230 kg/hm2 combined with drip irrigation is optimal for maize production in the Huang-Huai-Hai; it increased net income by 792.0 yuan/hm2 compared with conventional nitrogen fertilization and irrigation. |
| Key words: maize; nitrogen reduction; yield; population growth dynamics; economic benefits |
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