提高农作物的产量是农业研究的中心任务。对农作物进行化学分析得知,其干重的90—95％是由光合作用生成的。从植物生理学研究角度看,作物的生产能力可用一简单的公式表示:P=NAR×LAI×t式中:P 代表作物的原初生产能力。NAR 代表作物的净同化率,即作物每平方分米叶面积每天(或一周)干重增加数,以 CO_2或干重毫克/平方分米(天或周)表示。 Increasing the yield of crops is the central task of agricultural research. Chemical analysis of crops shows that 90-95% of their dry weight is produced by photosynthesis. From a plant physiology perspective, crop productivity can be expressed as a simple formula: P = NAR × LAI × t Where: P represents the primary production capacity of the crop. The net assimilation rate of NAR on behalf of the crop is the daily (or weekly) increase in leaf area per square meter of crop, expressed as CO2 or dry mg / dm3 (days or weeks).