干旱灌区冬小麦分蘖冗余的研究

通过人为去除分蘖(设处理A:于抽穗前期去除所有分蘖;B:于抽穗前期去除平均分蘖的1/3;C:于抽穗前期去除平均分蘖的1/2;D:于抽穗前期去除主茎,留侧茎及其余分蘖;E:对照)的方法对甘肃省河西绿洲灌区两个冬小麦品种的产量构成因子进行研究.结果表明:处理B和处理D两个冬小麦品种的总生物量和有效分蘖生物量均比相应对照高;各处理主茎的穗长、穗重、穗粒数和粒重与对照相比均以处理A最大,但均无显著性差异,而分蘖的穗长、穗重、穗粒数和粒重处理B和处理D均比相应对照大,处理A和处理C均比相应对照小.初步肯定冬小麦至少有1/3的分蘖是冗余的.

Tiller redundancy in winter wheat in irrigated arid areas

Yield components of two different winter wheat varieties in the Hexi irrigated area of Gansu were analyzed through all, 1/3, 1/2 tiller and main-stem removal and the control (CK), labelled as A, B, C, D and E respectively. The results indicate that total biomass and effective tiller weight of the two winter wheat varieties under treatments B and D are higher than under CK. Compared with CK, though main-stem spike length, spike weight, per-spike grain number and grain weight are highest in treatment A, there is no remarkable difference in these variables among treatments. Tiller spike length, spike weight, per-spike grain number and grain weight in treatments B and D are higher than in CK, but those in treatments A and C are lower than in CK. We therefore conclude that at least 1/3 tiller is redundant for winter wheat cultivation in Hexi area of Gansu.