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关中水地棉田,搞棉油两熟的主要矛盾是二者争无霜期。抓住主要矛盾,选用早熟品种或采用育苗移栽技术,1973-74两年获得大面积亩产油菜240-250斤、皮棉100-110斤的较好收成。具体做法是: 一、育苗移栽。油菜是白露育苗,霜降栽,苗龄不超过45天,密度不少于15000株;棉花是4月20日育苗,油菜收后5月20日移栽,密度不少于5000株。二、早熟品种。关中油菜病害严重,但早熟,8月底至9月初播种,5月15日收获,一般亩产250斤左右。选用早熟良种74-1(白菜型)、7110(甘兰型),亩产达300斤以上。棉花早熟品种如晋申200号、朝阳棉等,油菜收后5月25日播种,9月10日
Guanzhong water to cotton fields, engaged in the main contradiction between cotton two mature frost-free period. Seize the main contradiction, the choice of precocious varieties or the use of seedling transplanting technology, 1973-74 two years to obtain a large area of 240-250 kg per mu of rapeseed, lint 100-110 pounds of better harvest. The specific approach is: First, transplanting seedlings. Rape is white lotus seedlings, frost plant, age less than 45 days, the density of not less than 15,000; cotton is April 20 nursery, rape harvest after May 20 transplanting, the density of not less than 5000. Second, precocious varieties. Guanzhong rape disease is serious, but precocious, the end of August to early September sowing, May 15 harvest, generally about 250 pounds per mu. Selection of precocious 74-1 (cabbage type), 7110 (sweet type), per mu up to 300 pounds or more. Precocious cotton varieties such as Jin Shen 200, Chaoyang cotton, rapeseed harvest on May 25, September 10