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Why must organic fertilizer be applied continuously for sustained high cotton yields?
Although cotton is a relatively tolerant crop when it comes to poor soil, achieving high and stable yields requires cotton fields to have fairly high fertility. According to measurements by the Cotton Research Institute of the Chinese Academy of Agricultural Sciences, most cotton fields nationwide currently have insufficient fertility, and the levels of various nutrients vary widely and are very unbalanced. This is especially true in the cotton region of the Yellow River basin, where organic matter content is low, nitrogen supply is insufficient, available potassium content is declining rapidly, and the trace elements zinc and boron are also in the deficient or potentially deficient range. These have become important factors restricting the sustained and stable increase of cotton yields. Cotton is a deep-rooted crop, and its growth
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