争取穗大粒多的途径争取穗大粒多的途径,归纳起来大致有三种: 1.促花大穗认为只有穗大,才能粒多,强调促进小穗、小花数目以争取粒多,因而措施偏前、中期。 2.保花增粒认为穗粒数在很大程度上取决于小花的结实率,只要在一定小花数的基础上减少退化小花数,就可以保证一定的穗粒数,措施偏中、后期。 3.促保并重认为应首先促进小穗、小花数目以保证穗大,而后提高小花结实率以争取粒多,因而措施前、后兼顾。从理论上讲,“促保并重”是最理想的途径。但在生产过程中,由于情况的复杂变化和肥水条件的限制,“促保并重”不一定适合于任何情况,在某些情况下, For spike large grain more ways to fight spike large grain more ways, can be summed up in three ways: 1. Spike large spike that only the spike, to more grain, emphasizing the promotion of spikelets, floret number in order to fight more grain, so the measures are more Medium term. 2.Propagated kernels that grain number per spike depends largely on the rate of fruiting, as long as the number of small flowers on the basis of reducing the number of floret degradation, you can ensure a certain number of grains per spike, the measures in the late, late. 3. Promote and reaffirm that the number of spikelets and florets should be firstly promoted so as to ensure spikelets, and then the flocking rate of florets should be increased so as to obtain more grains, so that both measures should be taken into consideration before and after the measures. In theory, “promote both Paul and Paul” is the best way. However, in the production process, due to complex changes in the situation and fertilizer and water conditions, “to promote both security and” is not necessarily suitable for any situation, in some cases,