开发推广紧凑型玉米,无论是从玉米生产自身发展方向上看,还是从大农业实现高产优质高效的角度考察,都是非常必要的。就此问题,谈谈几点看法。一、紧凑型玉米的增产优势紧凑型玉米与普通玉米相比,具有叶片上冲,株型收敛的特点,单株遮阴面积比普通平展型玉米小30%以上。其增产优势主要表现在三个方面:一是适于高密度种植。紧凑型玉米适宜种植密度明显高于普通玉米,一般每亩可增1000～2000株。二是叶面积系数大,光能利用率高。据测定,紧凑型玉米群体合理叶面积指数比普通玉米高1.5左右,即每亩增加1000平方米的正 Development and promotion of compact corn, whether it is from the perspective of its own development of corn production, or from the perspective of large-scale agricultural production to achieve high yield and quality are very necessary. On this issue, talk about a few comments. First, the advantages of compact corn production Compact compact corn compared with ordinary corn, with leaves on the red, plant characteristics of convergence, shading area per plant smaller than the average spread of corn more than 30%. Its yield advantage mainly in three aspects: First, suitable for high-density planting. Compact corn planting density suitable for higher than ordinary corn, generally increased by 1000 to 2000 per acre. Second, the leaf area coefficient, high light utilization. It is determined that the compact corn population reasonable leaf area index of about 1.5 higher than ordinary corn, that is, an increase of 1000 square meters per mu