冬水田在云南省的稻田中占有一定的面积,这种田一年四季泡水,土粒高度分散,土温低,通气不良,鉄、硫等元素呈还原状态,秧苗移栽后返青慢,分蘖少,稻谷产量低于水旱田。近年来兴修水利后,已经解决或部分解决了灌溉问题的地区,大都进行了冬水田改水旱田工作。但改水旱田后,土壤即呈板结紧实现象,速效磷显著减少,甚至完全消失,因而变成了一种特殊的低产田。这种田又因土壤肥力和地势不同,低产的程度也有不同。农民称为“坐秋田”、“发红田”、“秋发田”或“摆子田”等。根据调查,这种低产田的分布 Winter paddy fields in Yunnan Province occupy a certain area of ​​paddy fields, the fields all year round soaked in water, soil particles are highly dispersed, soil temperature is low, poor ventilation, 鉄, sulfur and other elements were restored, transplanted seedlings turn green slowly, tillering Fewer, paddy output is lower than that of dry land. In recent years, water conservancy construction, have been solved or partially solved the problem of irrigation areas, most of the work carried out in winter paddy fields to dry farmland. However, after the paddy field was reformed, the soil was compacted, the available phosphorus decreased significantly, or even disappeared completely, which turned it into a special low yield field. Due to the difference in soil fertility and topography, the yield of this field is also different. Peasants called “take Akita,” “red hair”, “autumn hair field” or “zhibi Tian” and so on. According to the survey, the distribution of low yield fields