摘要
选用2个饲用春玉米品种,设计5个密度处理,研究了种植密度对玉米植株生长动态变化和饲草产量的影响。结果表明,随种植密度的提高,春玉米株高增大,单株绿叶片数和次生根数减少。春玉米叶面积系数随种植密度的增大而提高;但高密度条件下,春玉米生育后期叶面积系数下降较快。春玉米群体鲜重因种植密度的增大而提高,同时密度的增产效应随密度的增大而降低。一定范围内增大种植密度,春玉米群体干重提高,但当种植密度达到75000株/hm2时,群体干重出现下降现象。随种植密度的提高,春玉米空秆率增大,穗粒数和千粒重下降,但籽粒产量呈现先提高后降低的趋势。
Two forage spring maize cuhivars were used to research the effects of planting density on the growth of spring maize and its forage yield in this study. The results showed that with the increase of planting density, the height of spring maize plants increased, while the numbers of green leaves and secondary roots per plant decreased. The leaf area index （LAI） of spring maize increased with the increase of planting density, but in the conditions of much higher density, LAI decreased more quickly in the late growth stage. With the increase of planting density, population fresh weight of spring maize enhanced, but the yield-increasing effect of planting density on spring maize declined. Spring maize population dry weight improved with the increase of planting density in a reasonable range, but as density reached 75 000 plants/hm^2 , population dry weight declined. In the conditions of this study, with the increase of planting density, spring maize bare plant rates increased, and kernels per spike and 1 000-grain weight declined. Grain yield of spring maize improved with the increase of planting density in a reasonable range, but decreased in a much higher density conditions.
出处
《河北科技师范学院学报》
CAS
2009年第3期18-23,共6页
Journal of Hebei Normal University of Science & Technology
基金
河北科技厅"十一五"科技攻关课题(课题编号:06220103D)
关键词
春玉米
种植密度
饲草产量
动态变化
spring maize
planting density
forage yield
dynamic change
