Surplus nitrogen (N) in ground and surface water is of concern in intensive agricultural regions. Surplus N leaches during lengthy periods where annual crop systems are used in temperate regions. This paper presents a model to estimate the surplus N available for leaching to ground water beneath agricultural systems and applies the model to watersheds in an intensive maize and soybean productio...

this paper aims to predict and determine the net supply of manpower in islamic azad university - firouzkouh branch of for a specific period of time. for this purpose, markov chain model is used to analyze human resources data obtained previously. at last, the number of labors, arrivals, departures, shortages and also surpluses of each unit will be predicted for the next 5 years during 2011-2015...

Abstract About half of all N and P loads to Swedish waters originate from agriculture must decrease reach environmental goals. Studying nutrient management at farm level can provide an understanding recycling the risk losses. In a survey organic conventional dairy arable farms in three southern counties Sweden, farm-gate balances use efficiency (NUE) were analysed. Crop distribution differed si...

Abstract In the Nitrate Vulnerable Zones farmers are required to implement measures reduce nitrogen (N) surplus. Nevertheless, in some cases status of water bodies show that effect these remains insufficient despite global decrease N surpluses. The present work aims contribute with a method produces an appropriate indicator for mitigation effectiveness reducing groundwater nitrate pollution. Gl...