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研究春播胡萝卜的光合特性,结果表明,春胡萝卜不同品种、不同叶位叶片的光合速率有差异.品种间比较,新红高于新黑田五寸;不同叶位相比,上位叶高于下位叶.夏季晴天,春胡萝卜的光合速率在一天中表现上午高下午低,变化呈双峰曲线.春胡萝卜的产量与光合速度呈正相关“,”This experiment was carried out to study the characteristics of photosynthesis in carrot seeded in spring The result showed that different varieties were different in photosynthetic rates and leaf positions It was found that the diurnal changes of the photosynthetic rate formed a double peak curve There existed certain relationship between photosynthetic rate and yield