The senescent frequency contained the decline rate of leaf area, dry matter and chlorophyll content at the early filling phase and thus can be an indicator of premature senescence.

• 衰老频度涵盖了灌浆结实期单位时间内高效叶面积、叶干重、叶绿素含量3个指标的下降率，可作为判断早衰发生的量化指标。