The stage controlling seed number per ear during ear differentiation, safe booting date and safe heading date of wheat in Sichuan were discussed.
本文还讨论了四川小麦幼穗分化过程中引致穗粒数变异的时期，以及安全孕穗、抽穗期。
The stage from jointing to booting is long and the differentiation of young ear is abundant.
拔节孕穗期长，幼穗分化充分，有利于壮秆大穗的形成。
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