摘要
在冀西北的草甸栗钙土农田,研究了不同氮肥施用量对白萝卜产量及水分利用效率的影响。结果表明,不同氮肥用量都能不同程度地提高白萝卜的产量,当氮肥用量达225 kg·hm-2时,白萝卜的生物产量、经济产量、肉质根产量和经济效益均达到最大值,但是氮肥用量为150、225 kg·hm-2时,白萝卜的产量和经济效益差异不明显;除N225处理的肉质根中可溶性糖含量最低且与其他处理差异显著外,其他各处理的叶片和肉质根中可溶性糖含量无显著差异;当氮肥用量为150 kg·hm-2时,水分利用效率最高,为503.4 kg·hm-2·mm-1。过量施用氮肥不能提高白萝卜的品质和产量。随着氮肥施用量的增加,白萝卜叶片和肉质根对N、P和K养分的吸收也随之增加。本试验范围内,N 150 kg·hm-2、P2O5120 kg·hm-2、K2O 150 kg·hm-2是冀西北高寒区白萝卜高产、高效、低耗发展的合理施肥量。
The effects of nitrogen level on yield and water use efficiency of radish （ Raphanus sativus L. ） named ＇ Chun- hui＇ were studied in meadow - chestnut soil of northwest plateau of Hebei Province. The results showed that the yield of rad- ish was increased with the increase of nitrogen level. When the nitrogen level was 225 kg·hm-2, biomass, economic out- put, root yield and economic value of radish were all the biggest, but the nitrogen levels of 150, 225 kg ~ hm-2 had no difference. The soluble sugar contented in leaf and root in radish had no difference among treatments except for the nitrogen level of 225 kg · hm -2 which had the lowest soluble sugar content of root and was significant at p 〈 0. 05 level with other treatments. When the nitrogen level was 150 kg ·hm-2 , the WUE （Water Use Efficiency） of radish was the highest. Excess nitrogen fertilizer could not improve the quality and yield of radish. As applied nitrogen level increasing, nutrient absorption amounts of leaf and root to N, P2O5 and K：O were increased, The optimum fertilizing scheme was N 150 kg · hm-2, 1205 120 kg· hm-2, K2O 150 kg · hm-2 for high yield and high economic value and low consumption of radish in the northwest plateau of Hebei Province in this study.
出处
《中国土壤与肥料》
CAS
CSCD
北大核心
2014年第1期33-36,共4页
Soil and Fertilizer Sciences in China
基金
河北省科技支撑计划项目(11220701D)
张家口市科技支撑计划项目(1112012C-3)
