云南德宏州稻田硫素失调和磷石膏的增产效益

Sulphur Disbalance in Paddy Fields of Dehong Prefecture in Yunnan Province and Effects of Phosphorus-gypsum in Increasing Yields.

德宏州位于东经97°38′—98°43′,北纬23°46′—25°17′。地处云南高原边缘与支那半岛低矮地形的衔接过渡地带,境内以宽谷盆地为主,盆地周围为中切割中山山地,地带性气候属南亚热带山地季风气候,年均温19.5℃以上,年降雨量1400—1700mm,州内耕地以水田为主,大约有8.0×10~4ha多,地广人稀,施肥水平较低,经常发现大面积水稻减产,甚至出现水稻死亡现象。1984年以来,我们对德宏州的大气、降雨、灌溉水、土壤。

Based on the researches of natural environments,crops and humane ecology in Dehong prefecture of Yunnan province, it is found that nutrient physiological disbalance of rice created by sulphur shortage is the major cause for the yield reduction and mortality of rice. The shortage grades of sulphut and corresponding counter-measures are discussed.Years of sulphur-fertilizer experiments indicate that phosphorus-gypsum obtains the best effect in increasing yields, the average increment for rice is 1 076kg·ha^(-1).