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杂交稻的穗大粒多,灌浆期长,这是发挥增产潜力的基础,如灌浆条件(气候、营养)满足不了生理需求,结实率就要下降.关于杂交稻结实率低的原因,除受遗传因素影响外,还有多种因素,如秧苗弱、插秧迟,“大缓苗”、管理不及时,则影响生育,乃至不能在安全抽穗时期齐穗,满足不了灌浆的时间要求和温度要求.一般杂交稻开花期遇到低温,正常花粉减少,影响受精活力,直接影响受精机率;如后期遇到低温冷害,籽粒中光合产物的积累明显下降,就是造成大量空秕率的生理原因.但是栽培得法,促进稻株健壮生育,可以克服低温的不利影响,如1979年气温较低,而杂交稻的结实率并不低于高温的1978年,结实率多在75～80%,而1980年也有所
Hybrid rice has a large number of spikelets and a long grain filling period, which is the basis for increasing the yield potential. For example, grouting conditions (climate and nutrition) can not meet the physiological needs and the seed setting rate will decrease. Regarding the reasons for the low seed setting rate of hybrid rice, Factors such as seedling weak, late planting, “slow Huanmiao”, management is not timely, it affects fertility, or even heading in the safe heading heading, can not meet the grouting time requirements and temperature requirements. General hybrid rice encountered low temperature at flowering stage, the normal pollen decreased, affecting the fertilization vitality, a direct impact on the chance of fertilization; such as late cold chilling injury, the accumulation of photosynthetic products was significantly decreased, which is caused by a large number of empty ration rate of physiological reasons. Demonstrated that it can promote the robust growth of rice plants and overcome the adverse effects of low temperature. For example, when the temperature was low in 1979, the seed setting rate of hybrid rice was not lower than high temperature in 1978, and the seed setting rate was 75-80% more than in 1980 The