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光合作用是形成农作物产量的基础,农作物干物重的90—95％是光合作用的产物。提高光能利用率,无疑也是提高作物产量的重要途径。一、光能利用率与作物产量光能利用率是作物光合作用中所贮存的能量占其所在范围吸收能量的百分率。一般是用单位土地面积在单位时间里所接受的太阳辐射量,去除该条件下作物所增加的干重所折合的热量。承德地区光照资源丰富,太阳辐射量较高。从5月上旬至9月上旬的作物生长季内,辐射总量为每平方厦米63144卡,合亩接受量为42096.21×10~4千卡。目前我国农作物光能利用率平均为0.4％,仅占可能达到的最高利用率的1/30。如果光能利用率按1％计算,则大豆平均亩产应为339.3公斤,玉米为513.9公斤,高粱为542.3公斤,谷子为504.8公斤。然而在实际生产上,除个别地块外,远没有
Photosynthesis is the basis for the formation of crop yield, 90-95% of crop dry weight is the product of photosynthesis. Increasing the utilization of light energy is undoubtedly also an important way to increase crop yields. First, the rate of light energy utilization and crop yield of light energy utilization is the photosynthesis of crops stored energy accounted for its range of absorbed energy percentage. Generally, the amount of solar radiation accepted by a unit of land in unit time is used to remove the heat equivalent to the dry weight added by the crop under this condition. Chengde region is rich in light resources, the higher the amount of solar radiation. From the first ten days of May to the first ten days of September, the total amount of radiation was 63,144 cards per square meter of Haimi, and the total amount received per mu was 42096.21 × 10 ~ 4 kcal. At present, China’s crop utilization of light energy average 0.4%, accounting for only the highest possible utilization of 1/30. If light energy utilization is calculated at 1%, the average soybean yield per mu should be 339.3 kg, 513.9 kg for maize, 542.3 kg for sorghum and 504.8 kg for millet. However, in actual production, apart from individual plots, far from