تأثير الري بمياه الصرف الصحي المعالجة على التربة والنبات

A BSTRACT. A field exp eriment was conducted to eva lua te the effect of tr eated municipal wast e wat er o n whe at and a lfa lfa cro p in a silty-clay soil. Mean dr y matter yie ld of alfalfa was 94.8 kg per plot usin g Ireated water and 76.9 kg per plot using fresh wat er and was significantl y higher in tre ated water than fresh wat er irrig ati on . The mean gr ain yield of wheat was 6.74 ton s ha . 1 with treated wat er and 5.95 tons ha . 1 with fre sh water irrigation . The contents of Fe ( 145 rng g I) and Zn (35 .5 mg g I) in wheat crop wer e significantly high er with treated water irrig ati on as compared to Fe (133 mg g I) and Zn (26.5 mg g I) contents with fresh wat er. Similarly . Fe co nce ntrat ion of alfalfa cro p (359 rng g I) was significantly higher with treat ed water irri gation tha n with fresh water (325 mg Fe g I) . The co nce ntra t io n of toxic metal s suc h as Cu. Pb, Ni a nd Co in plants was be yond hazardous level s when co mpared to the establ ished sta nda rds. The concentrati on of N increased significa ntly in soils. Though P and K co nte nts showed incre asing trend using treat ed water but were not significantly different fro m that obtained with fresh water. The nutrient s in treated municipal waste water improved cro p yields demonstrating its co ntribution to meeting some of the crop nutrient need s.