关键词: 水分胁迫, 光照条件, 干物质, 产量, 数学模型

Abstract: 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穐a^-1.