叶片是植物的光合器官,是形成产量的基础,在一定的品种、一定的环境条件下,水稻总叶片数保持着一定的数量,在当地大体上晚熟品种总叶片数十四至十五个叶片;中熟品种十二至十三个叶片;早熟品种在十二个叶片以下。水稻一生中,随着发育过程逐渐出现各个叶片,其出现速度各不相同,一般认为下位叶片出现快,上位叶片出现较慢。我们在多年的科学实验、实践中观察到当地自然气候条件下,插秧后出叶速度具有 The leaves are the photosynthetic organs of the plant and form the basis of yield. Under a certain variety and environmental conditions, the total number of leaves in rice is kept at a certain amount. In general, there are about 14 to 15 leaves in late-maturing varieties ; Medium maturing varieties twelve to thirteen leaves; precocious varieties below twelve leaves. Rice in the life, with the gradual emergence of each leaf during the development process, the emergence of different speeds, the lower leaves generally appear faster, higher leaves appeared more slowly. In many years of scientific experiments, we observed in the local natural climate conditions, leaf out after the speed of leaf has