BACKGROUND: Soil nutrition management is an important factor, which determines the plant growth. Soil fertility is determined by the presence or absence of nutrients i.e. macro and micronutrients, which are required in optimum level for crop. OBJECTIVES: Evaluate the effect different amount of nitrogen and phosphorus fertilizers in maize field under sugarcane ...

This review addresses research done over the past 40 years on different aspects of agricultural phosphorus (P) management for environmental protection. Inputs P are essential profitable crop production. Long-term application to soils has resulted in elevated levels soil P. accumulation may be desirable from an agronomic point view but it represents a threat freshwater quality. Indeed, runoff la...

Coastal aquaculture can contribute to eutrophication of receiving waters. New technologies and improved management practices allow the aquaculture industry to be more sustainable and economically viable. Current practices, however, do not provide an additional use for effluent water. Nitrogen, phosphorus and other effluent compounds could be valuable plant nutrients. Inflow and effluent water f...

Experimental data from low nitrogen and phosphorus diets (Carter et al, 1999, 2000, 2003) are being used to validate and/or modify the NRC swine growth model. A profit maximizing daily growth model that considers feed costs, excretion, waste management costs, and length of feeding period is being developed.