特旱特涝年气候对棉花产量及发育的影响

本文采用陕西关中东部1971-2000年30年棉花生长季节4-10月的降水资料,对历史上影响范围最大,强度最强的1997年和1983年棉花产量及发育状况进行分析.结果表明:特旱年份,棉花产量整体呈减产趋势,特旱年棉花早衰明显而普遍,座桃难、脱落多,水旱地差异显著;特涝年份总体上棉花是减产的.特涝年秋季连阴雨导致高湿、寡照、棉田湿度大,铃病易于流行,使棉桃霉烂、脱落、僵瓣多、铃重降低,影响产量.

Influence of Unusual Drought And rainfall Climate on Yields And Development of Cotton

The meteorological data in the cotton growth season from April to October during 1971-2003 in the East of Guanzhong Areas in Shaanxi Province showed that in the year of Unusual drought,the cotton yields was trends to decrease and cotton development personality obviously and universal,irrigated land and dry farm difference markedly.in the year of more perception,the cotton yields drop in production.The more perception led to high humid and less sunlight and caused cotton fields high humidity and cotton boll disease was easily to prevalent.And reduced the cotton boll mildew rot,exfoliation,more stiff segment,the cotton boll weight and yield reduce.