CHAPTER 7: Water quality for irrigation

CHAPTER 7: Water quality for irrigationINTRODUCTIONI rrigation waters whether derived from springs, diverted from streams, orpumped from wells, contain appreciable quantities of chemical substancesin solution that may reduce crop yield and deteriorate soil fertility. Inaddition to the dissolve salts, which has been the major problem forcenturies, irrigation Water always carry substances derived from its naturalenvironment or from the waste products of man s activities (domestic andindustrial effluents). These substances may vary in a wide range, butmainly consist of dirt and suspended solids (SS) resulting into the emitters blockages in micro- irrigation systems and bacteria populations andcoliforms harmful to the humans and the OF Water quality FOR IRRIGATIONIn several studies carried out in the eighties on the various causes forthe clogging of the emitters, the engineers, based on the three majorinterrelated factors contributing to that specific problem, classified thewater according to the chemical quality , the physical and the classification although primary and simple seemed convenient for amore or less broad evaluation to cover the whole spectrum of irrigationwaters quality for crop production.

concentrations of 0.6 mg/litre. Toxicity occurs with the uptake of boron from the soil solution. The boron tends to accumulate in the leaves until it becomes toxic to the leaf tissue and results in the death of the plant. In arid regions, boron is considered the most harmful element in irrigation water. Other problems

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