在我省东北部高寒山区及冷凉的高二半山区,分布有较大面积的“灰泡土”、“灰塘土”、“羊毛土”等散土型的冷性土壤,在以洋芋为主的高寒山区,这类土壤很适合洋芋生长,但在以洋芋——玉米轮作为主的冷凉山区,虽然洋芋的产量高,但种植玉米则会产生“秋发”现象而减产。宣威县倘塘公社松林大队地处云贵两省交界的高原面上属上述气候土质类型。在毛主席的革命路线的指引下,全大队的各族贫下中农发扬了无产阶级硬骨头的革命精神, In the alpine mountainous area in the northeastern part of our province and the cool Mid-levels in the Mid-levels, there are a large number of scattered cold soils, such as “ash soils”, “ash ponds” and “wool soils” In the alpine mountainous area of ​​the main area, such soil is suitable for the growth of potato, but in the cold and mountainous area where potato and corn rounds are predominant, the output of potato is high, but planting corn will produce the phenomenon of “autumn hair” and cut production. If the commune Songlin brigade of Tongtang Commune of Xuanwei County is located above the plateau surface at the junction of Yunnan and Guizhou provinces, it belongs to the climate and soil types above. Guided by Chairman Mao’s revolutionary line, the poor and middle peasants of all ethnic groups in the entire brigade promoted the revolutionary spirit of the proletariat’s hard work,