Abstract
Two field experiments were carried out during growing seasons 2011 and 2012. It was executed in research farm of National Research Center in Nubaryia region, Egypt to study the effect of irrigation systems, fertigation rates by using the wastewater of fish farms “WWFF” in irrigation of potato. Study factors were irrigation systems (sprinkler irrigation system “SIS” and trickle irrigation system “TIS”), water quality (traditional irrigation water “TIW” and WWFF) and fertigation rates “FR” (20%, 40%, 60%, 80% and 100% NPK). The following parameters were studied to evaluate the effect of study factors: 1) Calculating the total amount of WWFF per season; 2) Chemical and biological description of WWFF; 3) Clogging ratio of emitters; 4) Yield of potato; 5) Irrigation water use efficiency of potato “IWUEpotato”. Statistical analysis indicated that, maximum values were obtained of yield under SIS × FR100% NPK × WWFF, also, there were no significant differences for yield values under the following conditions: SIS × FR100% NPK × WWFF > SIS × FR80% NPK × WWFF > SIS × FR60% NPK × WWFF > TIS × FR100% NPK × TIW. This means that, using WWFF in the irrigation can save at least 40% from mineral fertilizers and 100% from irrigation water under sprinkler irrigation system.
Highlights
Whenever good quality water is scarce, water of marginal quality will have to be considered for use in agriculture
Recycling the drainage water (DW) of fish farming, rich with organic matter for agriculture use can improve soil quality and crops productivity [1], and reduce the total costs since it decreases the fertilizers use, whose demand became affected by the prices and the framer’s education [2]
Organic matter content supports the cation exchange process in soils, which is important to the nutrition of plants [3]
Summary
Whenever good quality water is scarce, water of marginal quality will have to be considered for use in agriculture. In the more arid areas of the world, wastewater is used in agriculture, releasing high quality water supplies for potable use. Recycling the drainage water (DW) of fish farming, rich with organic matter for agriculture use can improve soil quality and crops productivity [1], and reduce the total costs since it decreases the fertilizers use, whose demand became affected by the prices and the framer’s education [2]. Precipitation of insoluble salts can occur due to chemical reactions among the elements added as fertilizers in irrigation water [6]. The objective of this study was maximizing utility from wastewater of fish farms in agriculture (potato cultivation) under arid regions conditions
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