抽穗是禾谷类作物(水稻、小麦、玉米等)发育完全的穗，随着茎秆的伸长而伸出顶部叶的现象。一般抽穗期是指全田50%植株开始抽穗。抽穗期是决定作物结实粒数的关键时期，需要特别管理。
拔节至抽穗期干旱胁迫极显著地降低冬小麦的氮素营养效率。
The drought stress from jointing to heading stage decreased nitrogen nutrition efficiency of winter wheat significantly.
研究了1，2，4-三氯苯和萘对抽穗期水稻叶片光合特性的影响。
The effects of 1,2,4-trichlorobenzene and naphthalene on photosynthetic characteristics of rice leaves were studied.
小花分化的开始时间主要与品种抽穗期早晚有关，与品种类型关系不大。
The beginning time of blossom differentiation was relation to heading period and not to cultivars type.
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