上海是全国棉花高产省、市之一。自1964年亩产过百斤以来,全市140多万亩棉田,17年平均亩产皮棉 119±21斤。但产量高而不稳,且很不平衡。产量最高的1978年亩产皮棉169斤,产量最低的1977年仅91斤,相差竟达78斤。同一年份各县之间的产量相差也颇悬殊,如1978年产量高的县亩产198斤,而低的县为132斤;1977年产量高的县亩产124斤,而低的县只为56斤,高低相差达66～68斤。因此,探讨棉花丰歉与生态条件之间的关系,研究能充分发挥增产潜力、抗避不利生态因素的高产稳产栽培技术体系,对于发展棉花生产具有现实意义。 Shanghai is one of the high-yield cotton provinces and cities in the country. Since 1964, over 100 kilos of mu produce, the city more than 140 million mu of cotton fields, 17 years, an average of 119 ± 21 pounds per mu lint. But the output is high and unstable, and very uneven. The highest output of 169 mu of lint in 1978, the lowest yield of only 91 pounds in 1977, an average of up to 78 pounds. In the same year, the yield difference between counties was also quite different. For example, in 1978, the yield of high-yielding counties was 198 kg per mu and that of the lower counties was 132 kg. In 1977, the high-yielding counties produced 124 kg per mu and the low ones were only 56 pounds, the difference between the level of 66 ~ 68 pounds. Therefore, it is of great practical significance to explore the relationship between apricot cotton and ecological conditions, and to study high-yield and stable-yield cultivation techniques that can give full play to yield potential and avoid unfavorable ecological factors.