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

加拿大大草原农业生产的可持续性要求施于土壤的养分有效地循环利用，而不是流失到环境中。 化肥也是农民的一项重要投入，提高化肥的使用效率有助于提高经济效益，今天大草原上的种植制度正朝着少耕或免耕的方向发展，更多的土地正在使用动物粪便，土地正在从生产一年生作物转变为饲料。 磷在新系统中的形态和转化没有很好的记录。 生产商报告说，对氮肥的需求减少了，一些生产商现在报告说，对添加的磷的需求减少了。 为了更好地施肥和土地利用决策，有必要了解这些保护性种植系统中的磷循环。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。

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.