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Journal of Agriculture ›› 2021, Vol. 11 ›› Issue (6): 6-12.doi: 10.11923/j.issn.2095-4050.cjas20191100264

Special Issue: 小麦 棉花

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Effects of Wheat-Cotton Cycled Straw Returning on Biomass and Nutrient Uptake of Cotton

Zhang Fan(), Zhou Qijun, Guan Li, Song Zhijun, Yang Chunling()   

  1. Anyang City Academy of Agricultural Sciences, Anyang 455000, Henan, China
  • Received:2019-11-13 Revised:2020-09-03 Online:2021-06-20 Published:2021-06-28
  • Contact: Yang Chunling E-mail:aynkyzf@126.com;ay1352580@163.com

Abstract:

The aim is to define the effect of wheat-cotton cycled straw returning on yield, biomass and nutrients accumulation of cotton, and to reveal the feasibility of potassium replacement. The application rate of wheat straw was designed as 4500 and 9000 kg/hm2(W4500 and W9000) respectively in cotton season and the application rate of cotton straw was designed as 7500 kg/hm2 in wheat reason. Additionally, K fertilizer rates were designed as K2O 150 and 300 kg/hm2 (K150 and K300) only in cotton season. The control was designed without straw returning and K fertilizer in both seasons. Results showed that compared with control, cycled total wheat-cotton straw returning significantly increased boll number, boll weight and lint yield of cotton. Biomass and NPK absorption of cotton were also significantly improved. The total wheat-cotton straw returning was more effective in promoting yield and nutrient uptake than the half wheat-cotton straw returning treatment, and was equal to K150 treatment, but significantly less effective than K300 treatment. Cycled wheat-cotton straw returning promoted K absorption much greater than N and P absorption. Cycled wheat-cotton straw returning could delay the premature senescence of cotton with potassium deficiency. So, chemical potassium fertilizer could be partly replaced by it.

Key words: Straw Returning, Yield, Biomass, Nutrient

CLC Number: