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| DOI：doi：10.13522/j.cnki.ggps.20180509 |
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| Response of Canopy Traits of Summer Cotton to Different Fertigations |
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SI Zhuanyun, GAO Yang, LI Shuang, ZHANG Chuangeng, LIU Junming, DUAN Aiwang
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Key Laboratory of Crop Water Use and Its Regulation, Ministry of Agriculture Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences, Xinxiang 453002, China
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| Abstract: |
| 【Objective】 This paper aims to investigate the impact of different combinations of irrigation schedule and nitrogen application on canopy traits of summer cotton. 【Method】The experiment was conducted at a field under drip irrigation in Xinxiang of Henan province. We compared three irrigation amounts: 30 (I1), 22.5 (I2) and 15 mm (I3), and five nitrogen applications: 0 (N0), 60(N1), 120(N2), 180(N3) and 240 kg/hm2 (N4). In each treatment, we measured plant height, leaf area index (LAI), leaf nitrogen content (LNC) and specific leaf weight (SLW).【Result】When the irrigation was 30 mm, plant height and LAI increased with nitrogen application up to 240 kg/hm2. When the irrigation was 30 mm and 15 mm, the plant height and LAI firstly increased with nitrogen application up to 120 kg/hm2 and then declined with a further increase in nitrogen application. As the plant grew, SLW monotonically increased while the LNC declined. In all nitrogen treatments, the SLW increased as irrigation amount decreased. Correlation analysis revealed that the yield and LAI were best correlated with R2=0.7035, while the yield and SLW was worst correlated with R2=0.072 6.【Conclusion】Nitrogen application significantly increased plant height, LAI and LNC. Water deficit effectively increased the SLW at flowering-bolling stage. The seed-yield and LAI was best correlated, implicating that LAI can be used as an indicator to predict summer cotton production. |
| Key words: irrigation; nitrogen application rate; summer cotton; canopy structure; dirp irrigation |
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