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棉花的单位面积产量,是每亩总铃数、单铃籽棉重和衣分的相乘积。一般来说,同一品种的铃重和衣分在年份间的表现是相对稳定的。因此,增加单位面积总铃数就成为棉花高产栽培中的主攻方向。但问题也并非完全如此,最近几年,由于铃重较常年显著降低,提高铃重又成为当前棉花生产上的一个关键性问题。据慈溪县农业局调查统计:从1963年到1974年的11年中,正常年份136个棉铃收1斤籽棉,干旱年份(1967年)160个棉铃收1斤籽棉,丰收年份(1965年和1968年)125个棉铃收1斤籽棉。可是,到1971年
The yield per unit area of cotton is the product of the total number of bolls per acre, the weight of cotton boll seed and the fraction of cottonseed. In general, the same variety of boll weight and clothing performance during the year is relatively stable. Therefore, increasing the total number of bolls per unit area has become the main direction of high-yielding cotton cultivation. However, the problem is not entirely true. In recent years, increasing boll weight has become a key issue in current cotton production due to a significant reduction in boll weight over the previous years. According to the Cixi County Bureau of Agriculture survey: from 1963 to 1974, 11 years, the normal year 136 bolls received 1 kg seed cotton, dry year (1967) received 160 bolls 1 kg seed cotton harvest years (1965 and 1968 Year) 125 cotton bolls received 1 kg seed cotton. However, by 1971