Phosphorus forms and cycling in conservation cropping systems of the Canadian prairies

加拿大大草原保护性耕作系统中磷的形态和循环

• 批准号: 327688-2007
• 负责人: Schoenau, Jeff
• 金额: $ 1.32万
• 依托单位: University of Saskatchewan
• 依托单位国家: 加拿大
• 项目类别: Discovery Grants Program - Individual
• 财政年份: 2007
• 资助国家: 加拿大
• 起止时间: 2007-01-01 至 2008-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=364408
• 关键词: Phosphorus; forms; cycling; conservation; cropping

Sustainability of agricultural production on the Canadian prairies requires that the nutrients that are applied to soils are effectively recycled rather than lost to the environment.  Fertilizers also represent a significant input cost to farmers and greater efficiency in their use contributes to better economic returns.Cropping systems on the prairies today are moving towards reduced or zero-tillage, more land is receiving application of animal manures, and land is being converted from production of annual crops into forages.  The forms and transformations of phosphorus in the new systems is not well documented.  Producers have reported less need for nitrogen fertilizer and some are now reporting less requirement for added phosphorus.  To make better fertilization and land use decisions it is necessary to understand the phosphorus cycle in these conservation - oriented cropping systems.The research will identify the important pools of soil phosphorus present and factors controlling their turnover and bioavailability in prairie landscapes.

加拿大大草原农业生产的可持续性要求施用到土壤中的营养物质有效地循环利用而不是流失到环境中。肥料也是农民的一项重要投入成本，更高的使用效率有助于获得更好的经济回报。今天大草原的种植系统正朝着减少或免耕的方向发展，更多的土地正在接受动物粪便的施用，和土地正在从生产一年生作物转化为饲料。磷在新系统中的形式和转化没有很好的记录。生产者报告说对氮肥的需求减少，有些人现在报告说对添加磷的需求减少。为了更好地施肥和土地利用决策，有必要了解这些保护中的磷循环-该研究将确定草原景观中土壤磷的重要库以及控制其周转和生物有效性的因素。