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晋北春播大豆区包括雁北、朔州全部及繁峙、宁武、神池、五寨、岢岚、岚县、偏关、河曲、保德、兴县等,种植面积100万亩左右,占全省的22％。大豆生产中的显著特点是低产不稳。平均大豆单产40公斤左右,最高年份73公斤,最低年仅20.6公斤,其主要原因是:(1)气候干旱,年降雨仅440毫米,每年都有不同程度的春旱、伏旱和秋旱,甚至连续性干旱发生;(2)土壤瘠薄,有机质含量不到0.5％,碱解氮仅15～45PPM,速效磷低于5PPM,属于5～6级土壤;(3)品
Spring sowing areas in northern Shanxi, including Yanbei, Shuozhou all and Fanzhi, Ningwu, Shenchi, Wuzhai, Langlan, Lan County, partial off, meandering, Baode, Xing County, planting area of about 100 mu, accounting for 22% of the province. The notable feature of soybean production is low yield instability. The average yield of soybean is about 40 kg, the highest is 73 kg and the lowest is only 20.6 kg. The main reasons are as follows: (1) The climate is arid with an annual rainfall of only 440 mm. There are varying degrees of spring drought, drought and autumn drought, and even Continuous drought occurs; (2) The soil is infertile with less than 0.5% of organic matter, only 15-45PPM of N, and less than 5PPM of quick-acting phosphorus, belonging to 5-6 grades of soil. (3)