离石县位于三川河中游,吕梁山脉西麓,东径110°55′,北纬37°21′～37°42′,总面积1324km~2。全县有农耕地68.29万亩,其中坡地占65.8％,人均耕地4.4亩。该县长期以来,由于自然和社会历史的多种原因,水土流失严重,自然灾害频繁,土壤瘠薄,生产经营粗放,作物产量低而不稳,温饱问题长期不能自给,是我省的贫困县之一。历史经验和实践证明,在人多地少的地方要想解决温饱问题,大力发展生产,提高单位面积产量是唯一的途径。粮食生产力的高低是以单产来代表的,而其生产力是集气候、土壤、作物及其栽培管理等综合因素作用的结果。在影响作物产 Lishi County is located in the middle reaches of the Sanchuan River, the western foot of the Lvliang Mountains, with an east diameter of 110 ° 55 ’and a latitude of 37 ° 21’-37 ° 42’N, with a total area of ​​1324km 2. The county has 682,900 acres of arable land, of which 65.8% of the slope, 4.4 acres of arable land per capita. Due to various reasons of natural and social history, the county has suffered from serious soil and water loss, frequent natural disasters, barren soil, extensive production and management, low and unstable crop yields, long-term shortage of food and clothing, and poverty-stricken counties in the province one. Historical experience and practice have proved that it is the only way to solve the problem of adequate food and clothing and to vigorously develop production and increase yield per unit of area in an area where the number of people and land is small. The level of food productivity is represented by yield, and its productivity is the result of a combination of factors such as climate, soil, crops and their cultivation and management. Affect crop production