The grain-leaf area ratio was a quantitative expressing way to evaluate the coordinative level of source-sink relationship and was taken as a comprehensive index to select the variety of high yield.
粒叶比是衡量源库关系是否协调的一种数量化表示方法，被作为筛选高产品种的综合指标。
The most distinctive biological feature is the Leaf Area Ratio(LAR), it is higher in former phase and lower in later, and decline to its smallest around the period of Milky Ripeness.
叶面积比率的生物学特征最为明显，冬小麦返青到拔节期间的叶面积比率最大，拔节之后，叶面积比率逐渐下降，在冬小麦乳熟期前后达到最小。
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