在高密度栽培条件下,改变玉米植株的田间排列方式,将清种改为二比空栽培并以清种为对照进行研究发现:二比空栽培由于疏密不等排列,使群体受光强度增大,尤其是中、下部叶片受光强度更优于清种,在空垄空间分布的中、下部叶片,其光合强度高,处于原垄内叶片光合强度虽低,但其平均光合强度远高于清种;二比空栽培的玉米,各时期叶面积指数均大于清种,尤其是中后期更明显,故有利于玉米灌浆;二比空栽培的玉米,根系和茎叶干重后期下降速度较慢,从而保证了后期的正常生长;二比空栽培根冠比小于清种;多点试验结果表明,二比空比清种增产11.2％～12.3％。 Under the condition of high density cultivation, changing the arrangement of maize plants in the field, changing the clear seed to two-empty seedling and using the clear seedling as the control, the results showed that The light intensity of the large and especially the middle and lower leaves was better than that of the clear ones. The leaf photosynthesis of the middle and lower leaves distributed in the space of the empty ridges was high, but the photosynthetic intensity of the leaves in the original ridge was low, . Compared with the empty cultivated corn, the leaf area index in each period was greater than that in the Qing Dynasty, especially in the middle and late stages. Therefore, it was in favor of maize filling. The dry weight of the roots and stems of the maize with two emptying ratios decreased more slowly, Thus ensuring the normal growth in the later period. The ratio of root to shoot in two-dimensional empty culture was less than that in the pure species. The results of multiple-point experiments showed that the yield of 11.2% ~ 12.3% of the two-empty ratio was increased.