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一、地力下降是当前棉花产量不能持续上升的一个突出问题 土壤是作物赖以生存的基础。各地高产社队的经验证明,凡是地力好的土壤,水、肥、气、热协调,抗灾能力强,棉花就高产稳产。但是,多年来由于对土地用养结合重视不够,棉田土壤有机质含量普遍下降,磷、钾缺乏,比例失调,严重影响了棉花产量的持续上升。荆州地区农科所1976年对天门县423块棉田土样进行分析结果:
First, the decline in fertility is the current cotton yield can not continue to rise a prominent issue Soil is the basis for the survival of crops. The experience of high-yielding communes and brigades in various places has proved that all cotton with good earthpower, water, fertilizer, gas and heat coordination and strong disaster-resistance ability have high and stable cotton yield. However, over the years due to insufficient attention to the combination of land use and maintenance, cotton soil organic matter content generally declined, phosphorus and potassium deficiency, the proportion of imbalance, seriously affected the cotton production continued to rise. Jingzhou Prefecture Agricultural Institute in 1976 on the Tianmen 423 cotton soil samples were analyzed: