1980—1983年在北威尔士学院农场适宜的温室里完成了三个盆栽试验,二个试验测定播期和施N对叶片生长的影响,第三个是测定播种密度和施N对叶片生长的影响,主茎叶片的伸展生长采用一定时间内尺子测量并进行不同播期之间的比较.N肥的增加能加快叶片伸展的速度但是不能影响叶片伸展的持续时间,叶片伸展速度在一定时间内随着茎杆的生长,主茎叶片的递增而加快,叶片伸展的持续时间也随叶片位置的递增而延长.并且与叶片生长期间的平均温度有关,九月份播种的作物通过叶片生长速度较快,持续时间较长来弥补太阳辐射的减弱,六月份播种的作物最长叶片出现在倒数第一茎间上,并且叶片出现较迟,对N反应敏感,叶片伸展速度变化与叶片中H的含量有着明显的联系,密度的加大使主茎上1—4叶片种播的面积增加,之后出现的叶片面积减小,这主要与叶片伸展持续时间的变化有关.叶片生长对作物产量和光合作用是非常重要的,叶片伸展速度和叶片伸展持续时间用L ER和LED来表示,影响叶片生产的主要环境因素是光强度、光量、光周期、温度,水和营养供应,在一般情况下,植物生长经历了温度,光周期和光强度的季节性变化.对环境的控制研究发现这此因素影响着作物的叶片生长. Three pot experiments were conducted in Northrop Grumman’s Greenhouse from 1980 to 1983, with two trials measuring the effect of sowing date and applying N on leaf growth. The third was to determine the sowing density and the effect of applying N on leaf growth , The main stems of the leaves of the growth of the growth of the ruler used to measure and conduct a comparison between different sowing date.The increase of N fertilizer can accelerate the speed of leaf extension but can not affect the duration of leaf extension, leaf extension speed in a certain period of time As the stalks grow, the main stem leaves progressively increase and the duration of leaf elongation also increases with leaf position, and with the average temperature during leaf growth, the seeding crops september grow faster through leaves Faster and last longer to make up for the weakened solar radiation. The longest crop of the crop sown in June appeared on the penultimate stem, and the leaf appeared later, which was sensitive to N reaction. The change of leaf elongation and the change of H in leaves Content has a clear connection, increasing the density of the main stem 1-4 leaves sowing area increased, followed by the emergence of the blade area decreases, mainly with the blade stretch continued Between the changes of leaf growth on crop yield and photosynthesis is very important, leaf extension speed and leaf extension duration with L ER and LED to represent the main environmental factors affecting leaf production is the light intensity, light intensity, photoperiod, In general, plant growth experienced seasonal changes in temperature, photoperiod, and light intensity as a function of temperature, water and nutrient supply, and environmental control studies have found that this affects the crop’s leaf growth.