【摘要】 以京丰1号甘蓝品种为试验材料,通过田间小区试验研究了不同氮肥用量对甘蓝产量、品质以及土壤NO3--N含量的影响.结果表明,(1)随着施氮量的增加,甘蓝产量呈先升高后降低趋势,并于施氮量为185.14 kg/hm2时产量最高(25.86 kg/8.4 m2).(2)随着施氮量的增加,甘蓝的NO3--N含量明显增加,而Vc和可溶性糖含量则逐渐下降,并且残留在土壤中的NO3--N含量持续增加.因此,为达到优质高产并同时保持土壤的可持续利用和提高氮肥利用率,在生产实践中甘蓝适宜氮肥施用量为185.14 kg/hm2.更多还原

【Abstract】 According to the field experiments,cabbage(Brassica oleracea var.capitata) yield,cabbage quality and nitrate content in soil under different nitrogen level were studied.The results showed that under a definite level,cabbage yield increased significantly as the using amount of nitrogen increased.The yield of cabbage was the highest under nitrogen fertilizer as 185.14 kg/hm2.NO3——N contents in cabbage and soil increased with the nitrogen levels arise.However,Vc and soluble sugar content of fresh cabbage decreased with the increasing of nitrogen.Therefore,for human health,nitrogen level should be maintained around 185.14 kg/hm2,in order to increasing yield,improving quality of vegetable and protecting environment.更多还原