نتایج جستجو برای: limited water management

تعداد نتایج: 1729714  

2016
Murali Krishna Gumma Birhanu Zemadim Birhanu Irshad A. Mohammed Ramadjita Tabo Anthony M. Whitbread Brian W. Eisenhauer

Implementing agricultural water management programs over appropriate spatial extents can have positive effects on water access and erosion management. Lack of access to water for domestic and agricultural uses represents a major constraint on agricultural productivity and perpetuates poverty and hunger in sub-Saharan Africa (SSA). This lack of access is the result of erratic precipitation, poor...

Journal: :Environmental Modelling and Software 2014
Holger R. Maier Zoran Kapelan Joseph R. Kasprzyk Joshua B. Kollat L. Shawn Matott Maria C. Cunha Graeme C. Dandy Matthew S. Gibbs Ed Keedwell A. Marchi Avi Ostfeld Dragan A. Savic D. P. Solomatine Jasper A. Vrugt Aaron C. Zecchin Barbara S. Minsker E. J. Barbour G. Kuczera F. Pasha Andrea Castelletti Matteo Giuliani Patrick M. Reed

The development and application of evolutionary algorithms (EAs) and other metaheuristics for the optimisation of water resources systems has been an active research field for over two decades. Research to date has emphasized algorithmic improvements and individual applications in specific areas (e.g. model calibration, water distribution systems, groundwater management, river-basin planning an...

Journal: :Environmental Modelling and Software 2012
Saman Razavi Bryan A. Tolson Donald H. Burn

Metamodelling is an increasingly more popular approach for alleviating the computational burden associated with computationally intensive optimization/management problems in environmental and water resources systems. Some studies refer to the metamodelling approach as function approximation, surrogate modelling, response surface methodology or model emulation. A metamodel-enabled optimizer appr...

Journal: :مدیریت اراضی 0

the effective management of available water for irrigation in arid region like iran has become increasingly important due to limited water supply. the need for irrigation water allocation in water limiting condition caused to use gis in order to manage information optimally and to have easy access. in the present study, the objective was to develop a planning support system to be adaptable to t...

The physiological process of germination depends on several environmental factors such as temperature, water potential, light, nutrients and smoke. Water and temperature are determinant factors for seed germination. Both factors can, separately or jointly, affect the germination percentage and germination rate. The effect of temperature on germination and water potential on germination canoften...

2010
Q. X. Fang L. Ma Q. Yu T. D. Wang L. R. Ahuja

Serious water deficits and deteriorating environmental quality are threatening agricultural sustainability in the North China Plain (NCP). This paper addresses spatial and temporal availability of water resources in the NCP, identifies the effects of soil management, irrigation timing and amounts, and crop genetic improvement on water use efficiency (WUE), and then discusses knowledge gaps and ...

Journal: :تولید گیاهان زراعی 0

concerning limitation of water resources, determination of the least water that can lead to the maximum yield is of great importance in crop production. in order to evaluate effects of deficit irrigation on grain yield and water use efficiency of some wheat )triticum aestivum) cultivars under different climatic conditions, two similar field experiments were conducted in 2004 in agricultural res...

Predicting the amount of water consumed would help the managers in exploitation of underground water systems so that they could manage consumption effectively. This issue, especially in Iran with repeatedly drought and limited water sources is significantly more important. In the present research, by using, artificial neural networks as a powerful tool in non-linear and indefinite processes hav...

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