Phosphorus cycling in conservation cropping systems of the Canadian Prairies

加拿大大草原保护性耕作系统中的磷循环

• 批准号: 327688-2006
• 负责人: Schoenau, Jeff
• 金额: $ 1.26万
• 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: 2006
• 资助国家: 加拿大
• 起止时间: 2006-01-01 至 2007-12-31
• 项目状态: 已结题
• 来源: https://www.nserc-crsng.gc.ca/ase-oro/Details-Detailles_eng.asp?id=332950
• 关键词: Phosphorus; cycling; conservation; cropping; systems

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, and more land is also receiving application of animal manures.  The forms and transformations of phosphorus in zero-till and manured soils of the Canadian prairies is not as well documented as for nitrogen.  Producers have reported less need for nitrogen fertilizer in these cropping systems and some are now reporting less requirement for added phosphorus. It is hypothesized that phosphorus cycling through organic fractions is more important and needs to be better understood to make appropriate P fertilization decisions in these new systems. The research will identify the important pools of phosphorus present in long-term no-till and manured lands, and the factors controlling phosphorus turnover and bioavailability.

加拿大大草原农业生产的可持续性要求施用于土壤的养分能够有效地回收，而不是流失到环境中。对农民来说，肥料也是一项重要的投入成本，提高肥料的使用效率有助于获得更好的经济回报。如今，大草原上的耕作制度正朝着少耕或免耕的方向发展，更多的土地也在接受动物粪便的施用。在加拿大大草原的免耕和施过肥的土壤中，磷的形态和转化并没有像氮那样被很好地记录下来。生产者报告说，在这些种植制度中，氮肥的需求减少了，有些人现在报告说，对添加磷的需求减少了。假设磷通过有机组分的循环更为重要，需要更好地了解，以便在这些新系统中做出适当的磷肥决策。该研究将确定长期免耕和施肥土地中存在的重要磷库，以及控制磷周转和生物有效性的因素。