| Cite this article: | 邓忠,翟国亮,王晓森,等.灌溉和施氮策略对滴灌施肥棉花蕾铃脱落的影响[J].灌溉排水学报,2017,36(8):. |
| DENG Zhong,ZHAI Guoliang,WANG Xiaosen,et al.灌溉和施氮策略对滴灌施肥棉花蕾铃脱落的影响[J].灌溉排水学报,2017,36(8):. |
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| Application Schedule of N-P-K in Drip Fertigation Affects Abscission of Cotton Bolls |
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DENG Zhong, ZHAI Guoliang, WANG Xiaosen, ZONGJie, FENG Junjie, CAI Jiumao, LYU Mouchao
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Farmland Irrigation Research Institute, Chinese Academy of Agricultural Sciences/
Key Laboratory of Water-saving Irrigation Project, Ministry of Agriculture, Xinxiang 453002, China; Key Laboratory of Water-saving Agriculture of Henan Province, Xinxiang 453002, China
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| Abstract: |
| This paper presents the results of a field experiment aiming to investigate the impact of different drip fertigation schedules on abscission of cotton bolls. We considered three irrigation amounts, 3 300, 3 900 and 4 500 m3/hm2, and four N application rates, 150, 225, 300, 375 kg/hm2. The N was either applied with P-K as topdressing fertilizer, or applied as topdressing with the drip irrigation while the P-K were used as base fertilizer. The results showed that the boll abscission increased first, peaking at the boll setting stage, and then decreased rapidly at the flowering stage under both N application methods. The abscission rate atirrigation of 3 900 m3/hm2 was the lowest in comparison with others. When the N application was 150 kg/hm2, the abscission rate of the cotton buds and bolls increased significantly under different N applications. The abscission was the lowest when N application was 300 kg/hm2, increasing when the irrigation amount and nitrogen application were either too low or too high. When N was applied with P-K as topdressing fertilizer at the rate of 291.25 kg/hm2 and the irrigation amount was 3 890.46 m3/hm2, the boll abscission was 53.60%, while under the same water and N applications, applying N-P-K as topdressing with the drip irrigation decreased the abscission by 49.12%. In summary, applying N with P-K as topdressing was more efficient in reducing the abscission compared with applying N together with the drip irrigation by using P-K as base fertilizer. |
| Key words: cotton； nitrogen application strategies； drip irrigation； boll abscission |
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