The environmental requirement of the river is the amount of water to maintain natural ecological conditions and health of quality of the river water. In this study, to estimate the environmental water requirement of Karoun River, Dez, Great Karoun and Beheshtabad sub-basin (upper Karoun) using hydrological Montana method and offers based on frequency analysis of hydrological flow normally and u...

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...

Nitrogen use efficiency (NUE), the ratio between N outputs in products over N inputs, is often used to evaluate N use outcomes of an agricultural system and/or the risk of environmental N losses. In this paper we address the question what NUE goals are realistic for dairy production systems. We use the following definitions of NUE: Crop NUE, defined as the percentage of the total N inputs taken...

Climate change is already affecting life on Earth and mitigation measures must be taken, which require proper identification of the regions most vulnerable to these changes. This study assesses impact climate water availability (water surplus, deficit precipitation minus evapotranspiration) classification across Caatinga biome, located within Brazilian semiarid region. To obtain surplus deficit...

JEZDINSKÝ ALEŠ, POKLUDA ROBERT, SLEZÁK KATALIN. 2016. Eff ect of Nutrient Supply on Some Selected Parameters of Sweet Pepper (Capsicum annuum L. cv. ‘HRF’) Transplants. Acta Universitatis Agriculturae et Silviculturae Mendelianae Brunensis, 64(2): 455–460. In the trial the eff ect of nitrogen defi ciency and potassium surplus on the dry weight, photosynthetic activity (A), transpiration (E), st...

An econometric analysis of Hong Kong’s monthly per capita water usage for the 25-year period of April 1985 through March 2010 reveals that per capita usage is insensitive to price but dependent upon past usage, per capita income, weather, and seasonal factors, with rising income countering what would otherwise be a downward trend. Given Hong Kong’s current inflationary environment and large gov...

The most compelling, yet unexplained, evidence for the coupled partitioning of water and energy by terrain and vegetation is the nonlinear relationship between drainage density, defined as total stream channel length per unit area, and a measure of surplus water in the landscape (Figure 1). In this classic example, the measure of surplus water is the sum, over 12 months, of ten times the mean m...

At the onset of ripening, some fleshy fruits shift the dominant water import pathway from the xylem to the phloem, but the cause for the decline in xylem inflow remains obscure. This study found that xylem-mobile dye movement into grape berries decreased despite transient increases in berry growth and transpiration during early ripening, whereas outward dye movement continued unless the roots w...

The agricultural sector is of particular importance in the city of Bijar. Thus, the economic value perunit of water applid to the side effects of excessive groundwater resources in this area has a utmostimportance. Payment for estimation of water on a suitable production function was estimated revenueproducers. Therefore in this study to estimate the economic value of water resources in agricul...