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This paper examines the economic rationale for using sprinklers for initial irrigation events, while using siphon tubes for remaining irrigations on the same crop, using cost data and descriptive information from an irrigation district on the west side of California's San Joaquin Valley. Many...
A watershed scale hydrologic model (DRAINWAT) for drained forested lands was developed by coupling DRAINLOB, a field scale forestry version of DRAINMOD and the ditch and channel routing model section of FLD and STRM. The simulation model was tested with 5 years (1988–1992) of data collected on...
The response of wheat (Triticum aestiuum L.) to varying depths of irrigation, quantity of water applied and to the drainage conditions was studied in 2 m × 2 m × 2 m size lysimeters filled in with a sandy loam soil. Saline water with an electrical conductivity of 8.6 dS m −1 was used for...
Simulation models, once validated for local conditions, can play an important role in predicting the distribution patterns of yield factors and thus help the farmer with decisions on management practices. Results from a soil water and N0 3 -N concentration analysis are presented describing their...
The effects of NaCl salinity on germination, growth, gas exchange and yield of greenhouse grown eggplant ( Solanum melongena , L. hybrid ‘Delica’) were studied. Plants were grown in sand-perlite mixture (1:3) and irrigated with half strength Hoagland nutrient solution containing 0, 10, 25,...
The real time EPIC-PHASE model developed at Toulouse Auzeville INRA was tested on a maize crop. The main objective of the trial was to evaluate the potential of the model in real time tactical irrigation management based on model predictions every 5 days. The trial compared the results of...
The hydraulic design of micro-irrigation systems to achieve high system uniformity has led design engineers to over-design irrigation systems arbitrarily. Commonly used emitter flow variations of 10–20% are equivalent to a uniformity coefficient of about 98-95%, or a coefficient of variation of...
Fertilizers are used in addition to irrigation water to increase soil fertility and productivity, but cropped areas are sources of groundwater contamination due to loads of nitrates carried downwards by seepage of excess water. The public is increasingly aware of the grave problems of...
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