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核桃花芽分为雌花芽和雄花芽,早实核桃除顶芽为雌花芽外,向下2~4个侧芽(最多可达20多个)也均为雌花芽。雌花芽萌芽后抽生结果枝,其顶端开花结果。雄花芽多着生在枝条的中、上部各节,萌发后只能形成雄花序。核桃雌花芽的分化,包括生理分化期和形态分化期。生理分化期约从中、短枝停止生长后的第3周开始,第7周结束,北方地区约为5月下旬至6月下旬。这是雌花芽分化的关键时期。形态分化期从生理分化期
Walnut flower buds are divided into female flower buds and male flower buds, early walnuts in addition to the top buds of female flower buds, down 2 to 4 lateral buds (up to more than 20) are also female flower buds. Female flower bud bud after sprouting results branches, the top flowering results. Male flower buds were born in the branches, the upper section, germination can only form a male inflorescence. Differentiation of walnut female flower buds, including physiological differentiation and morphological differentiation period. Physiological differentiation period from about, spur to stop growing after the beginning of the third week, the end of the seventh week, the northern region is about late May to late June. This is a critical period of female flower bud differentiation. Morphological differentiation from the physiological differentiation period