Transcription of CHAPTER 7: Water quality for irrigation
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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 eig
deterioration of its structure, thus rendering the soil impermeable to water and air. The increase in the concentration of exchangeable sodium may cause an increase in the soil pH to above 8.5 and reduce the availability of some micronutrients, e.g. iron and phosphorus. The degree of absorption to the clay particles of the sodium depends on
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