Welcome to Chinese Agricultural Science Bulletin,

Chinese Agricultural Science Bulletin ›› 2016, Vol. 32 ›› Issue (24): 103-108.doi: 10.11924/j.issn.1000-6850.casb16030060

Special Issue: 油料作物 棉花 农业气象

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Effects of Water and Nitrogen Coupling on Cotton Growth Characteristics and Yield in Arid Area

Yang Shoule1, Deng Zhong2, Zhai Guoliang2, Li Ying2, Song Zhiwei1, Jing Ming3   

  1. (1Henan Vocational College of Agriculture, Zhongmu Henan 451450; 2Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences / Key Laboratory of Water-Saving Agriculture of Henan Province, Xinxiang Henan 453002;3Yellow River Institute of Hydraulic Research, Zhengzhou 453000)
  • Received:2016-03-08 Revised:2016-08-05 Accepted:2016-06-24 Online:2016-08-29 Published:2016-08-29

Abstract: The objective is to analyze the growth mechanism of water and nitrogen coupling on mulched-cotton by drip irrigation. A completely random design of irrigation and nitrogen application was conducted for studying the coupling effects of water and nitrogen on cotton growth characteristics and yield. Results showed that the seedling to budding duration days were prolonged when the irrigation quota was 3300 m3/hm2, the flowering to boll opening duration days were shortened, and had lower above-ground dry matter accumulation. Cotton plant height, above-ground dry matter accumulation increased when the irrigation quota was 4500 m3/hm2, but the yield firstly increased then decreased with the nitrogen application rate increase. The duration days from the bud to full-boll stage was the shortest and the boll shedding rate was higher under different kinds of irrigation quota with the nitrogen application rate of 150 kg/hm2. The plant height and above-ground dry matter were highest when the nitrogen application rate increased to 375 kg/hm2, but the leaf area index, available bolls per plant and single boll weight were declined. The duration days of the bud to full-boll stage increased when the irrigation quota was 3900 m3/hm2 and the nitrogen application rate was 300 kg/hm2, which led to a lower boll shedding rate and optimized yield components, so the yield came to 6992.33 kg/hm2.