论文部分内容阅读
叶面积指数是指绿叶面积与土地面积的比值。甘薯叶面积指数与产量有着非常密切的关系。以前多数资料认为甘薯的适宜叶面积指数以3—4为好。小于3认为绿叶的光合面积不足,产量低;大于4则是徒长的表现,光能利用率低。新、老叶片更换频繁,也会影响光合产物的形成和积累。可是我们在山东省栖霞县北洛汤农科队亩产鲜薯万斤左右的高产田中,特别是1980年亩产鲜薯14557.6斤的高产田中,测得的叶面积指数,多在4—5之间,而且持续了较长的时间。因此,在当地条件下,我们认为甘
Leaf area index refers to the ratio of green leaf area to land area. Sweet potato leaf area index and yield have a very close relationship. Most of the information before that sweet potato suitable leaf area index to 3-4 as well. If less than 3, the photosynthetic area of green leaves is insufficient and the yield is low; if it is greater than 4, it is a lengthened performance with low utilization of light energy. New and old leaf replacement frequently, will also affect the formation and accumulation of photosynthetic products. However, we measured the leaf area index in the high-yield field of about 10,000 kg of fresh potato per mu in North Luodong Teams, Qixia County, Shandong Province, especially in the high-yield field of 14,557.6 kg per mu of fresh potato in 1980, Between, and lasted a long time. Therefore, under local conditions, we think it is willing