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水稻田间所需的水量是农业生产所探讨的重要课题。植物的需水量系指植物蒸腾和植被下土壤表面蒸发的总耗水量,即农田总蒸发量。田间实际耗水量,农业上有时也称为需水量,事实上它们的含义是不相同的,因为耗水量除水稻蒸腾耗水外,还包括穴间蒸发与田间渗漏。早稻全生育期需水量,据有关方面测定:长江中下游在300—570毫米。也有的认为需710毫米。还有的认为早稻一生需水量330—345毫米,或752.48毫米。差异很大。为了研究农田需水量,英国著名农业物理学家彭曼(penmen)创立了蒸发蒸腾势的概念。它的定义是:长着矮的绿色作物,高度一
The amount of water required for paddy fields is an important topic for agricultural production. Plant water demand refers to the total water consumption of plant transpiration and soil surface evaporation under vegetation, that is, total farmland evaporation. Actual field water consumption, sometimes also called water demand in agriculture, in fact, their meaning is not the same, because water consumption in addition to water transpiration of rice, but also including the hole evaporation and field leakage. The demand of early rice throughout the growth period, according to the determination of the relevant areas: the middle and lower reaches of the Yangtze River at 300-570 mm. Others think it takes 710mm. Others think that the water requirement of early rice is 330-345 mm, or 752.48 mm. big difference. In order to study the demand for farmland, penmen, a famous British agricultural physicist, founded the concept of evapotranspiration. It is defined as: a short green crops, a high degree