云南中部、南部石灰岩地区的红壤性冬水田和湖泊边缘的淹水田,冬干落水以后,次年稻苗就会出现“发红”的生理病症,使产量降低.群众把这种田称为“发红田”、“黄昏田”或“坐秋田”,全省约有七十万亩,以红河、玉溪、文山、思茅、曲靖等专州分布较多,约占稻田面积的10%左右,为本省主要低产田之一.如遇旱年,发红田面积扩大,对生产的影响更为严重. After the red-paddy winter paddy field in the central and southern limestone areas of Yunnan Province and the flooded paddy fields at the edge of the lake and winter dry-up and dry-down, the following year’s rice plants will have “reddening” physiological conditions that will reduce the yield. Hongtian, Dusk Field or Sitting Akita, with a total area of ​​about 700,000 mu in the province. There are more prefectures such as Honghe, Yuxi, Wenshan, Simao and Qujing, accounting for about 10% of the paddy field area. One of the major low-yield fields in the province In case of dry years, the area of ​​Red-field expanded and the impact on production was more serious.