• 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Plant and Soil >Long-term nitrogen fertilizer replacement value of cattle manures applied to cut grassland
【24h】

Long-term nitrogen fertilizer replacement value of cattle manures applied to cut grassland

机译：牛粪在割草中的长期氮肥替代价值

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

Manures supply nitrogen (N) to crops beyond the year of application. This N must be taken into account for agronomic and environmental reasons. From 2002 to 2006 we conducted a field experiment on a sandy soil in The Netherlands (52p03"N, 6p18"E) to better quantify this residual N effect. Treatments comprised different time series of mineral fertilizer N or cattle manures of different compositions, all applied at a rate of 300 kg total N ha-p# year-p#, whilst compensating for differences in available potassium and phosphorus. Dry matter and N yields of cut grassland responded positively (P < 0.05) to both current manure applications and applications in previous years, whereas mineral fertilizer N affected yields in the year of application only. N yields could be reasonably well predicted with a simple N model, adopting an annual relative decomposition rate of the organic N in manure of 0.10-0.33 year-p# during the year of application and 0.10 year-p# in the following years. Subsequent model calculations indicated that the N fertilizer value (NFRV) of injected undigested cattle slurry rises from an observed 51-53% when slurry is applied for the first time, to approximately 70% after 7-10 yearly applications, whereas it took two to four decades of yearly applications to raise the NFRV of surface applied farm yard manure to a similar level from an initial value of 31%. Manures with a relatively high first year NFRV (e.g. anaerobically digested slurry) had a relatively small residual N effect, whereas manures with a low first year NFRV (e.g. farm yard manure) partly compensated for this by showing larger residual effects. Given the long manuring history of most agricultural systems, rethinking the fertilizer value of manure seems justified. The results also imply that the long term consequences of reduced N application rates may be underestimated if manuring histories are insufficiently taken into account.
机译：超过施肥年份，粪便向作物提供氮（N）。由于农艺和环境原因，必须考虑该N。从2002年到2006年，我们在荷兰的沙质土壤（52p03“ N，6p18” E）上进行了田间试验，以更好地量化这种残留的N效应。处理包括不同时间序列的矿物肥料N或不同成分的牛粪肥，全部以300 kg总N ha-p＃年-p＃的比例施用，同时补偿了有效钾和磷的差异。割草后的干物质和氮素产量对当前的粪肥施用量和前几年的施用量均呈积极响应（P <0.05），而矿物肥料氮素仅在施用年份影响产量。使用简单的氮模型可以合理地很好地预测氮的产量，采用施肥年中有机氮的年相对分解速率为0.10-0.33年-p＃，随后几年为0.10年-p＃。随后的模型计算表明，注入的未消化牛粪浆的氮肥值（NFRV）从首次施用粪浆时观察到的51-53％上升到每年施用7-10年后的约70％，而花了两个每年要进行四十年的申请，以将表层农田肥料的NFRV从最初的31％提高到相似的水平。第一年NFRV较高的粪便（例如，厌氧消化的泥浆）具有相对较小的残留N效应，而第一年NFRV较低的粪便（例如，农场粪肥）通过显示更大的残留效应来部分补偿。考虑到大多数农业系统悠久的肥料历史，重新考虑肥料的肥料价值似乎是合理的。结果还暗示，如果不充分考虑施肥历史，可能会低估氮肥施用量降低的长期后果。

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