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攀西地区旱地面积514.3万亩,占耕地面积的81.4％,因冬春(11—4月)干旱,蒸发量大,多数旱地不能种植小春作物,据1984年统计,全区有冬闲地387.2万亩。怎样开发利用这一广阔的土地资源是农业科研和生产上急待解决的问题。一、攀西晚秋气候资源及冬闲地分布根据大春作物收获期的调查和早期霜冻(最低气温≤0.0℃)出现的时间,统计晚秋有利的气候资源及冬闲地的分布是: 1、金沙江、安宁河等河流坝区,海拔1800米以下,从8月下旬—1月中旬,积温为1942.2—2237.5℃,降雨量149.3—347.0毫米,日照705.2—919.1小时。大春以玉米、烤烟为主,有冬闲地105万亩。 2.“二半山”海拔1800—2300米,从7月下旬—11
Panxi area of 514.3 hectares of dry land, accounting for 81.4% of arable land, due to winter and spring (11-4 months) drought, evaporation, most dry land can not be planted small spring crops, according to 1984 statistics, the region has 3.872 million mu. How to develop and utilize this vast land resource is an urgent problem to be solved in agricultural research and production. I. Climatic resources and winter fallow land distribution of Panxi in late autumn According to the investigation of early spring crop harvest and the appearance of early frost (minimum temperature ≤0.0 ℃), the favorable climate resources and the distribution of winter fallow land in late autumn are as follows: 1. The Jinsha River , Anning River and other river dam area, 1800 meters below sea level, from late August to mid-January, accumulated temperature 1942.2-2237.5 ℃, rainfall 149.3-347.0 mm, sunshine 705.2-919.1 hours. Spring to corn, tobacco-based, there are 105 acres of winter fallow. 2. “Half Hills” 1800-2300 meters above sea level, from late -11 -11