裸大麦不同播期的生育特点及其产量的关系

裸大麦不同播期生育特点与积温关系密切，随着播期的推迟，所需积温相应减少。不同播期的分蘖增长与播期早、迟关系很大，两个类型品种均表现为随播期的推迟群体总茎蘖数减少。但从分蘖日增长量最高出现的时间来看，早播的出现在越冬前至越冬期；中播的出现在越冬期至返青期；迟播的出现在返青期以后。不同播期其生育期与总积温相关密切，全生育期总积温比全生育期天数的稳定性大得多。不同播期幼穗发育进程关系密切，穗分化各发育时期随播期的推迟而推迟，持继的时间也应相应缩短。播期与产量的关系表现为播期越迟，减产的幅度越大。

The relation of net barley''''s growth charact and yield with various seeding time

The growth charact of various seeding time net barley shows close relationship with accumulative temperature. The accumulative temperature that it is needed decrease with seeding time delated. It shows close relation with seeding time that net barley grows and tillers. Two various type species all shows that total stem and tillers decrease with seeding time's delation. The stage of the most dayly increase amount of tiller comes at, early seeding's comes before winter and in overwintering, mid - seeding's in over wintering and turn green periods, late's after turn green. It shows close relationship with total accumulate temperature the growth time of various seeding time.The total accumulate temperature is more stable than the days that the net barley needs through all growth. The young ear's development is interrelated closely with seeding time. The time of various stage of young ear growth is delated with seeding time, the continue time also is shorter. Seeding time shows close relation with yielel, it means the later the seeding time, the greater the yield decrease.