1981年美国阿肯色州大学农艺系斯杜特(C.A.Stutte)用水稻、玉米、棉花、高粱、大豆等作物和苍耳、曼陀罗等几种杂草作材料,研究了蒸腾作用与挥发性氮素损失的关系,给予人们很多新的启示,他的研究结果特别对水稻合理施用氮肥的时间、施用量、品种的选择和计算氮素在植物体内的转换和利用,很有指导意义。 (一)水稻叶片伴随蒸腾作用损失氮素的量过去认为植物体内的氮素可随叶片的吐水作用、根的溢泌作用和雨水、露水的淋失作用损失一部分氮素,但其数量十分有限,不足引起人们重视。最近斯杜特用了两个水稻品种作材料,从分蘖期起分别测定不同叶位的叶片的 In 1981, the Department of Agronomy, University of Arkansas, USA (CAStutte) used several kinds of weeds such as rice, corn, cotton, sorghum, soybean and other materials such as Xanthium sibiricum and Datura stramonium to study the relationship between transpiration and volatile nitrogen The relationship between prime loss and others gives us a lot of new revelations. His research results are very instructive especially for the time, amount of application and variety selection of rice and the conversion and utilization of nitrogen in plants. (I) Loss of nitrogen associated with transpiration of rice leaves In the past, it was thought that nitrogen in plants could lose a part of nitrogen with the spit water of leaves, the root exudation and leaching of rainwater and dew, but the quantity was very limited , Insufficient attention has drawn people’s attention. Recently, Stilt used two rice cultivars as materials. From the tillering stage, the leaves of different leaf positions