...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Ciência e Agrotecnologia >Ammonia volatilization from enhanced-efficiency urea on no-till maize in brazilian cerrado with improved soil fertility
【24h】

Ammonia volatilization from enhanced-efficiency urea on no-till maize in brazilian cerrado with improved soil fertility

机译：巴西塞拉多免耕玉米上高效尿素中的氨挥发，土壤肥力得到改善

获取原文
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

High nitrogen losses by ammonia volatilization are expected when urea is used as the source of N. The use of controlled-release urea and urease inhibitors are possible strategies to reduce such losses and increase nitrogen use efficiency. This study aimed to evaluate nitrogen losses by ammonia volatilization from stabilized, slow and controlled release urea and its absorption by maize grown under no-till in an improved Cerrado soil. Four N sources were used: conventional urea, urea + N-(n-butyl) thiophosphoric triamide (NBPT), urea + Cu and B and urea coated by sulfur + polymers. These N sources were surface applied along the rows using three N doses of 100, 150 and 200 kg ha -1 . No N was added to the control. Data were collected regarding N losses by volatilization, the N contents accumulated in the stubble and grains, and the yields of the stubble and grains. Stabilized urea and slow release urea were efficient for postponing the ammonia volatilization peaks. The urease inhibitors postponed the peaks for up to two days, reducing the accumulated volatilization by 18% when compared with common urea. Polymer sulfur coated urea resulted in a 37% reduction in ammonia volatilization. Increasing the N application rate to 200 kg ha -1 resulted in 16% greater yields and 37% greater N accumulation in the plants relative to the control. However, the stabilized and slow-release urea did not improve the N accumulation or yield. Consequently, the nitrogen use efficiency of maize was not improved relative to the use of conventional urea.
机译：当使用尿素作为氮源时，氨挥发会导致氮的大量损失。使用控释尿素和脲酶抑制剂是减少此类损失并提高氮利用效率的可能策略。这项研究旨在评估稳定，缓慢和控释尿素中氨挥发引起的氮损失，以及在改良的塞拉多土壤中免耕种植的玉米对氮的吸收。使用了四个氮源：常规尿素，尿素+ N-（正丁基）硫代磷酸三酰胺（NBPT），尿素+铜和硼以及被硫+聚合物包覆的尿素。使用三个N剂量分别为100、150和200 kg ha -1沿行对这些N源进行表面处理。没有将N添加至对照。收集有关通过挥发损失的氮，残茬和谷粒中累积的氮含量以及残茬和谷粒的产量的数据。稳定的尿素和缓释尿素可以有效地延迟氨挥发峰。尿素酶抑制剂将峰值推迟最多两天，与普通尿素相比，其累积挥发减少了18％。聚合物硫包被的尿素使氨挥发减少了37％。与对照相比，将氮肥施用量提高至200 kg ha -1可使单株产量提高16％，氮素积累提高37％。但是，稳定和缓慢释放的尿素不能改善氮的积累或产量。因此，相对于常规尿素的使用，玉米的氮利用效率没有提高。

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