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| Effects of water-fertilizer interaltion with planting density on water and nitrogen use efficiency and yield of winter wheat under sprinkler irrigation system |
| ZOU Luyang1,2,CHEN Zhen1,DUAN Fuyi1,MA Chunya1,FAN Yongshen1* |
| 1. Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences /Key Laboratory of Water Saving Agriculture of Henan Province, Xinxiang, Henan 453002, China; 2. Graduate School of Chinese Academy of Agricultural Sciences, Beijing 100081, China |
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Abstract To study the effects of different planting density and nitrogen application frequencies on soil moisture, nitrate nitrogen content, and winter wheat yield under the conditions of integrated irrigation and water and fertilizer application. The experiment set two planting densities(187 and 262 kg/hm2)and three nitrogen application frequencies(three times after topdressing, two times after topdressing, and one time after topdressing). The test results show that planting density and nitrogen application frequency significantly affect winter wheat grain yield, and there is a significant interaction effect between them. With the planting density increasing, the soil water storage in the winter wheat growing period from 0 to 100 cm increases significantly. The soil water content in the root growth layer of the main growing period increases significantly, and the water content at the depth of 100 cm in the booting stage increases. Compared with D1, it increases by 29.42%, 3.10% and 32.04%. While the water content at the depth of 80cm soil layer during the grouting period increases by 29.69%, 27.52%, and 25.71% compared with D1. When the planting density is 262 kg/hm2 and the frequency of nitrogen application is once, the yield of winter wheat is higher, and the soil nitrate nitrogen in the deep soil layer is less in the season. Comprehensive analysis shows that the planting density and nitrogen application frequency are the local winter wheat growth best practice.
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Received: 20 December 2019
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