实际作物腾发量是水平衡模型计算的一个重要变量，它和每日降雨量，灌溉量及土壤径流量共同计算静止水的亏缺量。
Actual evapotranspiration is a significant variable in the water balance calculation. It links daily rainfall, irrigation amount and soil bypass flow to calculate an immobile water deficit.
拔节期水分亏缺对干物质累积量影响最大。
Water deficit at jointing stage affected mostly dry matter accumulation.
作物腾发量受土壤水分亏缺的制约，在不同的生长阶段，影响的大小亦不同。
The quantity of evapotranspiration of crops is limited by soil moisture deficits, in different growth period, the influences is different.
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