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水稻齐穗期的早晚,影响灌浆成熟和产量的高低.以沈阳地区丰锦品种为例,常年安全齐穗期为8月10日.如能在安全齐穗期以前齐穗,空秕率只有10%左右,8月15日以后齐穗,空秕率达15～20%,减产2～3成,8月20日以后齐穗,减产更多.因此,准确地预测水稻齐穗期,并根据安全齐穗期的要求,采取相应的栽培管理措施,促进提早抽穗,这不仅对战胜低温冷害具有实际意义,而且也是实行计划栽培的重要措施.
The heading date of full-heading rice will affect the maturity of grain filling and the level of grain yield.As an example of the Fengjin variety in Shenyang, the perennial safe heading date is August 10. If the heading date is reached before the safe heading date, the empty grain yield is only 10% or so, and after 15 August, the percentage of empty rice reached 15-20% and the yield reduced by 20-30%. After August 20, the yield was more than expected, so the full heading date of rice and According to the requirements of safe heading date, corresponding cultivation management measures should be taken to promote early heading. This not only has practical significance for overcoming cold damage, but also is an important measure to implement planned cultivation.