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稻作产量的90%以上来自绿色器官(主要是稻叶)的光合制造,因而在一定范围内,适当增大群体的叶面积,就能提高光能利用和单位面积产量.掌握水稻不同生育时期的叶面积指数,可为高产栽培中决定促控措施和总结群众丰产经验提供科学依据. 测定水稻绿叶面积的方法,有印迹法,称重法和面积法等.由于面积法具有方法简易,不需仪器设备,并可直接在田间定点作连续测定等优点,因而目前仍被广泛应用.测定时只需量取穴内每一绿叶的叶长(L)与叶最阔处之宽度(B),即可计算单叶面积(S),将单叶面积累加,即得该穴叶面积.单叶面积计算公式:
More than 90% of the output of rice comes from the photosynthesis of green organs (mainly rice leaves), so within a certain range, increasing the leaf area of the group can increase the utilization of light energy and yield per unit area. Of the leaf area index for high yield cultivation decisions to promote control measures and to sum up the experience of mass production provide a scientific basis for the determination of green leaf area of rice methods, there are imprinting method, weighing method and the area method, etc. Because the area method has a simple method, not Need equipment and can be directly measured in the field for continuous determination of advantages, which is still widely used in the determination of the amount of acupoints only need to measure the leaf of each leaf length (L) and the width of the leaf width (B) You can calculate the single leaf area (S), the single leaf area cumulative, that the hole area of the leaf.Each leaf area formula: