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假设每年晴天有2000小时左右,而农作物能接受的光照只有500小时左右。但绿色植物叶表面所能接收到的日光,只能吸收其中的75%,其余25%又被反射掉或通过叶片时没有被吸收利用跑掉了。就是被叶绿素组织所吸收了的光能中,其中大约95%以上又转变成为热能,或是在植物水分的蒸腾过程中被消耗掉了。太阳辐射能的真正利用系数,只在0.5—5%之间,个别植物在极有利的短期内可利用到10%在农作物整个生育期内,
It is assumed that there are about 2,000 hours of sunny weather each year, while the crop can only receive about 500 hours of light. However, the surface of green leaves can receive sunlight, which can only absorb 75% of the remaining 25% were reflected off or through the leaves were not absorbed and ran away. Of the light energy absorbed by the chlorophyll, about 95% of it is converted into heat energy or consumed by the transpiration of plant water. The true utilization factor of solar radiation, only between 0.5-5%, individual plants in very favorable short-term available to 10% of the crop throughout the growth period,