China is a populous agricultural country, the arable land is the most basic resources which is needed for agricultural production, the quality of arable land has a direct impact on the entire agricultural production and development ,so to carry out the Evaluation of Farmland is a very important foundation work which is advantage to know china’s arable land resources and to improve the efficienc...

The over-application of phosphorus, as manure by animal feeding operations, is a threat to surface water quality. Concentration of animal feeding operations and over application of manures to cropland has lead to a build-up of phosphorus on many farms (Greaves et al., 1999). Relative to crop needs, manure slurries contain higher levels of phosphorus than nitrogen. When manure is applied to meet...

Concerns about manure P and water quality have prompted new regulations imposing P limits on land application of manure. Previous research established that P limits increase land needs for animal feeding operations. We evaluated the effect of N, annual P, and rotation P limits on the feasibility of manure management. A mechanistic model characterized manure management practices on 39 swine oper...

BACKGROUND: Giardia lamblia is the most frequently identified human intestinal parasite in Canada with prevalence estimates of 4-10%. However, infection rates vary by geographical area and localized 'pockets' of high or low infection rates are thought to exist. Water-borne transmission is one of the major routes of infection. Sources of contamination of drinking water include humans, domestic a...

A number of scientific methodologies have been used in assessing land degradation globally. However, the use of local knowledge in eliciting indicators of land degradation has seen little application by scientists and policy makers. Researchers believe the two approaches could complement each other to provide a holistic assessment of land degradation. The objective of the study was to find out ...

Soil health assessments associated with organic amendment applications have primarily focused attention on manure or composts. Yet, quantifying specific changes in soil biosolids land has yet to be determined. Our objectives were evaluate the various indicators, and utilizing Management Assessment Framework (SMAF), quantify indicator scores indices as affected by either increasing inorganic N f...

*Support for this paper was provided by Cooperative Agreement 43-3AEM-3-80137 between USDA and the University of Illinois. It does not represent the official views of either institution. This draft has benefitted from discussions with Ken Chomitz, Peter Feather, Charles Hallahan, Ralph Heimlich, Laurian Unnevehr, and participants in seminars at IFPRI, the World Bank, Resources for the Future, U...