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左云县属典型的高寒丘陵区,土壤类型以山地草甸土、栗钙土为主;海拔1 020～2 013 m,年均气温6.1℃,年均有效积温2 429℃,无霜期95～123天,昼夜温差大,日照充足;年均降水量409 mm,全年降水70%以上集中于7～9月。秋季土壤湿度小,气候凉爽。全县农作物播种面积41.66万亩,其中大豆面积4.82万亩。农业部大豆高产创建项目在左云县实施4年来,大豆单产不断提高,2011年在马道头乡10亩旱地高产田亩产达217.9 kg,创晋西北高寒旱区大豆历史最高纪录。
Zuoyun County is a typical alpine hilly region. The soil types are mainly mountain meadow soil and chestnut soil. The elevation is 1 020 ~ 2 013 m, the average annual temperature is 6.1 ℃, the average effective accumulated temperature is 2 429 ℃ and frost-free period is 95 ~ 123 Day, large temperature difference between day and night, adequate sunshine; average annual rainfall of 409 mm, more than 70% of the annual rainfall concentrated in July to September. Autumn soil moisture is small, the climate is cool. The county sown area of 416,600 mu of crops, of which soybean area of 48,200 mu. In the four years since the implementation of the Ministry of Agriculture soybean production in Zuoyun County, soybean yield continued to increase in 2011 in Ma Tau Tau township 10 acres of dry land per mu yield of 217.9 kg, a record Northwest high-cold arid zone soybean record.