精河、博乐两县有二十余万亩老耕地,在这次土壤普查中,我们综合自然的和社会的成土条件、成土过程和土壤属性,以及培肥利用等,把其中的绝大部分暂定为灌耕土。 一、灌耕土的形成 精、博两县的灌耕土,主要分布在排水良好的洪积—冲积扇中下部及河床深切的博尔塔拉河阶地上。地下水埋藏一般5—20米或更深。成土母质为黄土状洪积一冲积物。在生物气候带上处于温带漠境向半漠境过渡的地区。年均温5—7.4℃,七月份平均气温22—25℃,一月份平均气温-18—-16℃,年较差40—41℃;≥10℃的年积温2700—3580℃;年平均降水 Jinghe, Bole and two counties have more than 200000 acres of arable land. In this soil survey, we integrated natural and social conditions of soil formation, soil forming process and soil properties, as well as the use of fertilizers, etc., The vast majority tentatively irrigated farming soil. First, the formation of irrigated soil Fine, irrigated soil in Bo County, mainly in the well-drained alluvial-alluvial fan in the lower reaches of the bed and the deep Bortala River terraces. Groundwater buried generally 5-20 meters or deeper. The parent material is loamy alluvial-alluvial sediment. In the bioclimate zone in a transition from temperate desert to semi-desert. Average annual temperature of 5-7.4 ℃, July average temperature of 22-25 ℃, the average January temperature of -18-16 ℃, the annual poor 40-41 ℃; ≥ 10 ℃ annual accumulated temperature 2700-3580 ℃; annual average precipitation