【摘要】 通过田间试验研究不同施氮量对小白菜产量和硝酸盐含量的影响,结果表明,小白菜产量和硝酸盐含量均随着施氮量的增加而增加,呈极显著的正相关;小白菜基于产量的适宜施氮量是180kg/hm~2,而基于卫生品质的适宜施氮量≤90kg/hm~2。更多还原

【Abstract】 Through field experiment,the effect of different nitrogen rates on the yield and nitrate contents of Chinese cabbage(Brassica campestris ssp.Chinensi.S) was studied.The results showed that the yield and nitrate contents of Chinese cabbage increased with enhancing the amount of the nitrogen fertilizer.There was significantly positive correlation between the rate of nitrogen and yield,or nitrate contents.The reasonable N rate of application were 180kg/hm~2according to its yield and≤90kg/hm~2 according to its quality.更多还原