1.太阳能利用率:是指在某单位面积上,一定期间内照射下来全部短波辐射量R对净生产量N的比例。表示所照射下来的太阳能的百分之几被利用于干物质生产.这个场合下分母和分子必须是相同单位。因为辐射能通常用卡路里(Cal)表示,即净生产量也必须换算成卡路里.因为植物体大部分是碳水化合物形成的,通常每克能量约作4000 Cal计算,但象大豆种子一类脂肪、蛋白质含量高的物质,每克干物质能量可高达5520 Cal,因此,在把净生产量换算成卡路里的时候,首先,必须分部位测定每克干物质的能量.实际 1. Solar energy utilization: refers to the unit area, a certain period of irradiation of all shortwave radiation R to the net production of N ratio. Indicates how many percent of the solar energy that is irradiated is used for dry matter production, in which case the denominator and the numerator must be the same unit. Since radiant energy is usually expressed in cal, net production must also be converted into calories, since most plants are made of carbohydrates, which is usually calculated as 4000 cal per gram of energy, but fat like soybean seeds, Highly proteinated substances can yield up to 5520 cal of energy per gram of dry matter, so when converting net production to calories, first, the energy per gram of dry matter must be determined by location.