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云南是一个位于热带和亚热带地区的高原省分,生物气候带除受纬度的影响之外,还受垂直带的影响,有立体农业的特点。全省土地大部分属于红壤,由于干、酸、瘦、薄和缺磷,障碍着我省粮食产量的大幅度提高。1975年以来,全省不少地方结合红壤改良利用进行了熟制改革的试验、示范和推广工作,取得了显著成效。从气象条件看,滇东北地区的昭通,年均温12℃,年降雨量837毫米,(其中冬春半年仅降雨216毫米)无霜期200—234天。滇中地区的昆明,年均温14.8℃,年降雨量约1000毫米,无霜期243天。滇南地区的蒙自,年均温18℃,年降雨量837毫
Yunnan is a plateau province located in the tropics and subtropics. Apart from latitude, the bioclimatic zone is also affected by the vertical belt and has the characteristics of three-dimensional agriculture. Most of the province’s land belongs to the red soil, due to dry, acid, lean, thin and lack of phosphorus, hinder the substantial increase in grain production in our province. Since 1975, quite a lot of experiments have been carried out in many parts of the province in connection with the improvement and utilization of red soils. They have demonstrated and promoted the reform and achieved remarkable results. Weather conditions, Zhaotong in northeastern Yunnan, with an average annual temperature of 12 ℃, the annual rainfall of 837 mm, (of which only 216 mm winter and spring rainfall) frost-free period 200-234 days. Kunming in central Yunnan, with an average annual temperature of 14.8 ℃, annual rainfall of about 1000 mm, 243 days frost-free period. Mengnan in southern Yunnan, with an average annual temperature of 18 ℃, the annual rainfall of 837 milliliters