摘要
以三叶期乌塌菜为试材,防虫网条件下,采用单因素随机区组试验,设计了6个氮水平,探讨了不同施氮量对乌塌菜的生长、产量、品质、效益和氮素的吸收利用的影响。结果表明:随着氮肥施入量的增加,乌塌菜的株高、根质量和地上部鲜质量、单株产量、总产量均随施氮量的增加呈现明显的先增高后下降趋势,叶片数没有明显的规律性变化,根冠比、纤维素含量呈下降趋势,硝酸盐含量呈上升趋势;N 22.5g·m^(-2)氮肥水平的根质量、地上部鲜质量、单株产量和总产量、产值和效益均达到最大;乌塌菜的净菜率、硝酸盐含量增加,维生素C含量和纤维素含量降低;总吸氮量、氮肥吸收利用率先升高后降低,N 22.5g·m^(-2)处理吸氮量达到最大值,N 15.0g·m^(-2)处理氮肥吸收利用率达到最大值,氮素的农学利用率和偏生产力均呈下降趋势。氮肥对乌塌菜的品质影响很大,合理施用氮肥,能显著提高效益和改善氮素的利用情况。该试验条件下,乌塌菜最佳氮肥施用量为N 22.5g·m^(-2)。
Under the condition of different insect nets,single factor randomized block design was applied with trefoil stage savoy as test material.Six nitrogen rates were designed to investigate the effects of N fertilizer on the growth,yield,quality,economic benefit and N utilization of savoy.The results showed that change trends of some indicators first increased and then decreased such as plant height,root weight,aboveground fresh weight,yield of per plant and yield.Leaf number had no obvious regularity changes with the increase of nitrogen fertilizer.The root-shoot ratio and fiber content were both on the decline and the nitrate content was on the increase.With the application of N22.5g·m^-2,the greatest yield was obtained,as well as root weight,aboveground fresh weight and yield of per plant.The net-head rate and nitrate content of savoy increased and vitamin C content and fiber content decreased with the increase of nitrogen fertilizer.With the increase of N fertilizer total N uptake and N fertilizer use efficiency increased first and then decreased.Total N uptake was the largest with the application of N 22.5g·m^-2.N fertilizer use efficiency was the largest with the application of N 15.0g·m^-2.ANUE and PFP were both on the decline.Nitrogen had a great influence on the quality of savoy.And reasonable application of nitrogen fertilizer could significantly increase the economic benefit and improve N utilization.And the content of cellulose and nitrate were moderate.Under test conditions the best amounts of nitrogen fertilizer was N 22.5g·m^-2.
出处
《北方园艺》
CAS
北大核心
2017年第16期1-6,共6页
Northern Horticulture
基金
海南省自然科学基金资助项目(20153109)
三亚市农业科技创新资助项目(2014NK27)
关键词
氮肥
乌塌菜
生长
效益
氮素利用
nitrogen
savoy
growth
economic benefit
N utilization
