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根据武汉地区多年生产实践和气象记录,油菜亩产500斤的光能利用率只有1—2%。目前大面积单产较低的原因之一,是由于光能利用的限制因素较多。我们初步认为有以下几方面的限制因素:一、旱涝风冻不良气候因素武汉地区地处华中,光,热、水在油菜生育期中的总量比较大,尤其是生长初期和后期。亩产500斤的油菜全生育期总辐射热为252—253卡/厘米~2日;大于5℃的有效积温为2,806—2,220℃,日平均温度8.77—11.88℃;日平均日照为
According to years of production practice and meteorological records in Wuhan, 500 kg of rape per mu yields only 1-2% of the light energy utilization. At present, one of the reasons for the low yield per unit area is due to the limitation of light energy utilization. First of all, we have the following limiting factors: First, the droughts and floods unfavorable climatic factors Wuhan is located in central China, light, heat, water, the total amount of rape during the relatively large, especially in the early and late growth. The total radiant heat of rapeseed with a yield of 500 kg during the whole growth period was 252-253 cal / cm -2. The effective accumulated temperature above 5 ℃ was 2,806-2,220 ℃ and the daily average temperature was 8.77-11.88 ℃. The daily average sunshine was