...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Pedosphere >Effects of N forms and rates on vegetable growth and nitrate accumulation
【24h】

Effects of N forms and rates on vegetable growth and nitrate accumulation

机译：氮素形态和比例对蔬菜生长和硝酸盐累积的影响

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Experiments were carried out on a vegetable field with Peking cabbage (Brassica pekinensis (Lour.) Rupr.), cabbage (Brassica, chinensis var. oleifcra Makino and nemoto), green cabbage (Brassica chinensis L.), spinach (Spinacia oleracea L.) and rape(Brassica campestris L.) to study the effects of N forms and N rates on their growth and nitrate accumulation. The results indicated that application of ammonium chloride, ammonium nitrate, sodium nitrate and urea significantly increased the yields and nitrate concentrations of Peking cabbage and spinach. Although no significant difference was found in the yields after application of the 4 N forms, nitrate N increased nitrate accumulation in vegetables much more than ammonium N. The vegetable yields were not increased continuously with N rate increase, and oversupply of N reduced the plant growth, leading to a yield decline. This trend was also true for nitrate concentrations in some vegetables and at some sampling times. However, as a whole, the nitrate concentrations in vegetables were positively correlated with N rates. Thus, addition of N fertilizer to soil was the major cause for increases in nitrate concentrations in vegetables. Nitrate concentrations were much higher in roots, stems and petioles than in blades at any N rate.
机译：实验在菜地上进行，其中包括北京卷心菜（Brassica pekinensis（Lour。）Rupr。），卷心菜（Brassica，chinensis var。oleifcra Makino和nemoto），绿色卷心菜（Brassica chinensis L.），菠菜（Spinacia oleracea L.）。 ）和油菜（Brassica campestris L.）研究N形态和N速率对其生长和硝酸盐积累的影响。结果表明，氯化铵，硝酸铵，硝酸钠和尿素的施用显着提高了北京白菜和菠菜的产量和硝酸盐浓度。尽管施用4种氮素后产量没有显着差异，但硝态氮比铵态氮增加了蔬菜中硝酸盐的累积量。随着氮素含量的增加，蔬菜的产量并未持续增加，氮素的过量供应降低了植物的生长。 ，导致产量下降。对于某些蔬菜和某些采样时间的硝酸盐浓度，这种趋势也是如此。但是，总体而言，蔬菜中的硝酸盐浓度与氮含量呈正相关。因此，向土壤中添加氮肥是增加蔬菜中硝酸盐浓度的主要原因。在任何氮素水平下，根，茎和叶柄中的硝酸盐浓度都比叶片中的浓度高得多。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号