【摘要】 以"美国大速生"莴苣为试材,采用小区试验和化学测定相结合的方法,研究了氮肥施用量对莴苣产量和品质的影响。结果表明:随着氮肥施用量的增加,莴苣中可溶性糖含量、维生素C含量及产量都呈先上升后下降的趋势,硝酸盐含量呈上升趋势;综合分析,莴苣高产优质的尿素施用量为20g/m2。更多还原

【Abstract】 Taking lettuce as the material,the relationship between nitrogen application and the lettuce quality and yield were analyzed by the district experiments and chemical assay.The results showed that the content of soluble sugar,content of vitamin C and yield increased and then decreased,the Nitrate content increased with the nitrogen application.The best nitrogen application of lettuce was 20 g/m2.更多还原