These plant - type characters of " yedan 12 " resulted in an improving crown - canopy structure which favoring conditions of aeration and solar penetration , so suitable enlargement of planting density would enable maize plants to extending their active photosynthetic area which promoted bigger ears with more kernels and then attained high yield of grains per plant 掖单12这种株型特点改变了植冠构造，更有利于通气条件和阳光透射，这样适当增大植株密度将使玉米植株扩大活性光合作用面积，促成大穗、穗粒数更高，因此单株籽粒产量更高（表9 ） 。
By calculating the maximum stress of stalk under the condition of different speed of the unit and the location of the action point of pushing stalk , which is done by the module of ansys , the conclusion can be received : the maximum stress is increased with the increase of the velocity of the unit and the process of the pushing stalk can be trouble - free if the location of the action point is raised under the condition that the speed of the unit and the planting density of stalk are definite value 利用ansys功能模块对在不同机组作业速度v和推杆作用点l _ 0情况下，茎杆最大应力计算得知：茎秆的最大应力smx随着机组作业速度v的增加而增大，在机组作业速度v和秸秆密度一定时，提高推秆作用点，可保证推秆过程顺利进行。
The results of the determination of solar penetration of various treatments in earring stage indicated that the percentage of solar penetration of " yedan 12 " was higher than that of " luyu 2 " whether in low or in high planting density and whether receiving low or high rates of n application , even in planting density of 78 , 000 plants / ha maize plants still grew normally 抽穗期对各处理测定光照透射率的结果表明掖单12的光照入射率高于鲁玉2号的，无论在低或高植株密度、施用低或高量氮肥，即使在密度78 , 000株/公顷时，玉米植株也能正常生长。
