| Yield, water and nitrogen utilization in the wheat\|maize intercropping system under different nitrogen levels |
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| DOI：10.7606/j.issn.1000-7601.2022.04.12 |
| Key Words: wheat\|maize intercropping nitrogen application levels yield water use efficiency agronomic efficiency of nitrogen |
| Author Name | Affiliation | | LI Menghao | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Physiological Ecology and Tillage in North Western Loess Plateau, Yangling, Shaanxi 712100, China | | LI Qianqian | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Physiological Ecology and Tillage in North Western Loess Plateau, Yangling, Shaanxi 712100, China | | LIU Pengzhao | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Physiological Ecology and Tillage in North Western Loess Plateau, Yangling, Shaanxi 712100, China | | ZHANG Pengfei | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Physiological Ecology and Tillage in North Western Loess Plateau, Yangling, Shaanxi 712100, China | | CHEN Xiaoli | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Physiological Ecology and Tillage in North Western Loess Plateau, Yangling, Shaanxi 712100, China | | REN Xiaolong | College of Agronomy, Northwest A&F University, Yangling, Shaanxi 712100, China
Key Laboratory of Crop Physiological Ecology and Tillage in North Western Loess Plateau, Yangling, Shaanxi 712100, China |
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| Abstract: |
| In this study, a two\|year field experiment was conducted to explore the yield and water use efficiency of wheat\|maize intercropping system under three nitrogen application levels: N0, N1, and N2 represent 0, 120, and 240 kg·hm-2 for wheat and 0, 180, and 360 kg·hm-2 for maize, respectively. The yield of intercropped wheat was significantly increased by 21.34%~27.80% than that of sole wheat during both years, and the yield advantage of intercropped wheat mainly came from the yield increase of border-1-row and border-2-row. However, the yield disadvantage of intercropped maize was mainly through the decrease of border rows. The yield of intercropped maize was affected by nitrogen rates, where maximum reduction (3.02%~11.43%) for N0 and N1 levels during both years, only higher than that of sole maize under N2 level. Compared with sole maize cropping, the grain yield of inner maize was increased by 6.27%~12.68%. In the two\|year experiment period, the LER of wheat\|maize intercropping was between 1.04~1.16, which had the advantage of land use. The water consumption of wheat\|maize intercropping system was less than that of sole crops with same yield, and the maximum reduction in water consumption was observed for N1 level, and the average water consumption of the intercropping system was 47.30 mm less than that of the sole crops during both years of experiment. The water use efficiency of wheat\|maize intercropping system was increased by 2.77%~6.46% than that of sole crops during both years. The wheat\|maize intercropping system had the advantages of water saving and water use under three nitrogen application levels. Intercropping also improved the nitrogen agronomic utilization efficiency of wheat and maize and the nitrogen partial productivity of wheat. Within two years, the nitrogen partial productivity and nitrogen agronomic utilization efficiency of intercropping wheat reached 64.17 kg·kg-1 and 11.17 kg·kg-1. These results suggest that wheat\|maize intercropping system should be more feasible to develop under rain fed condition in semi humid area. |
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