农艺措施对水稻群体特征的影响

载插密度、施肥方法等农艺措施因影响群体特征而影响水稻产量。密度增大，群体茎蘖峰值提前，落差增大，品种分蘖力、群体分蘖力、分蘖效率皆降低；群体LAI增加，但群体势容比却下降，粒充实度也随之下降。施肥方法改变，上述诸项指标也随之呈规律性改变，但其显著性因品种而异。

EFFECT OF AGRONOMIC METHODS ON POPULATIONCHARACTER OF RICE

The experiment showed that characters of rice population were influenced by garonomic methods, such as planting density(PD) and fertilizing method(FM). The peak value of shoots population shifted to an earlier date and the drop of uiezd was bigger when planting density was increased. The tillering capacity of variety(TCV), tillering capacity of population(TCP), total spikelets per 667 m\+2(TSM), grade of filled grain(GFG) and ratio of adjusted photosynthetic potential to sink( P/S ) of all decereased with the increase of PD, but LAI increased with the increase of PD. Aforementioned indexes of population assumed a regular change with the change of FM, but the significance level of index might vary with the varieties.