| Effect of water and nitrogen interaction on maize utilization efficiency of fertilizer, water and yield formation in the Middle Hilly Area of Sichuan Province |
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| DOI：10.7606/j.issn.1000-7601.2021.06.23 |
| Key Words: maize drip irrigation water and nitrogen interaction utilization efficiency of water and fertilizer yield |
| Author Name | Affiliation | | LIU Fan | College of Agronomy of Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture, Chengdu, Sichuan 611130, China
Key Laboratory of Crop Ecophysiology and Cultivation, Sichuan Province, Chengdu, Sichuan 611130, China | | LIU Binxiang | College of Agronomy of Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture, Chengdu, Sichuan 611130, China
Key Laboratory of Crop Ecophysiology and Cultivation, Sichuan Province, Chengdu, Sichuan 611130, China | | LIU Jiayuan | College of Agronomy of Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture, Chengdu, Sichuan 611130, China
Key Laboratory of Crop Ecophysiology and Cultivation, Sichuan Province, Chengdu, Sichuan 611130, China | | DU Xia | College of Agronomy of Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture, Chengdu, Sichuan 611130, China
Key Laboratory of Crop Ecophysiology and Cultivation, Sichuan Province, Chengdu, Sichuan 611130, China | | KONG Fanlei | College of Agronomy of Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture, Chengdu, Sichuan 611130, China
Key Laboratory of Crop Ecophysiology and Cultivation, Sichuan Province, Chengdu, Sichuan 611130, China | | YUAN Jichao | College of Agronomy of Sichuan Agricultural University, Chengdu, Sichuan 611130, China
Key Laboratory of Crop Ecophysiology and Farming System in Southwest China, Ministry of Agriculture, Chengdu, Sichuan 611130, China
Key Laboratory of Crop Ecophysiology and Cultivation, Sichuan Province, Chengdu, Sichuan 611130, China |
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| Abstract: |
| The purpose of this study was to study the effects of different water and nitrogen configuration on the utilization rate of fertilizer and water and yield formation of maize. In this experiment, no nitrogen application and no irrigation was used as control (CK). Two nitrogen fertilizer levels of 25% nitrogen reduction (180 kg·hm-2, N180) and normal nitrogen (240 kg·hm-2, N240) with four different drip irrigation quantities (B0：0 m3·hm-2; B1：375 m3·hm-2; B2:750 m3·hm-2;B3:1 125 m3·hm-2) were designed as treatment groups. The results showed that LAI, dry matter accumulation and nitrogen accumulation increased with the increase of nitrogen application and drip irrigation, and there were interaction effects. Drip irrigation promoted absorption and utilization of nitrogen fertilizer. Under the reduced nitrogen application, B3 treatment increased agronomic use efficiency, partial productivity and apparent use efficiency of nitrogen by 9.55%, 22.25% and 118.69%, respectively, when compared with B0 treatment. Under the normal nitrogen condition, drip irrigation over 750 m3·hm-2 tended to inhibit nitrogen fertilizer absorption and utilization. Nitrogen application increased water use efficiency (WUE), and WUE of biomass treated with N reduction and normal N increased by 14.47% and 31.83%, respectively, compared with CK treatment. There was no significant difference between grain WUE treated with N reduction and normal N. Under the reduction of 25% nitrogen condition, maize yield increased with the increase of amount of drip irrigation, B3 treatment increased by 5.84%, 1.33%, 0.46% respectively, as compared to B0, B1 and B2 treatments. Under the normal nitrogen the maize yield first increased and then reduced. Under the reduction of 25% nitrogen and the drip irrigation of 750~1 125 m3·hm-2, the yield reached the same level as with the normal nitrogen and no drip irrigation condition. Nitrogen reduction combined with proper irrigation not only promoted maize growth, but increased dry matter accumulation and nitrogen absorption and utilization, thus increased maize yield. It could be considered as an effective measure to reduce nitrogen fertilizer and increase efficiency and drought\|resistant and high\|yield. In this experiment, the optimal water nitrogen combination was pure nitrogen of 180 kg·hm-2 with drip irrigation of 750~1 125 m3·hm-2. |
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