Effect of Different Irrigation Treatments on Growth and Yield of Barley Crop@@@تأثير معاملات مختلفة من الري على معدل نمو وإنتاجيةمحصول الشعير

An expe rime ntal study was carr ied out to estimate the effect of different irrigatio n level s o n growth and productivity of barle ycro p. Th e ex­ periment was conducted at Had a Al-Sh arn Sta tion of King Abdulaziz Uni­ versity in Saudi Ar abia. The irrigatio n tre atments were designed based o n the depleti on rat io meth od, where, the considered depl et ion rati os for the tre atments were 50% , 30% , and 10% from the tot al available wate r in soil­ roo t depth . The applied irrigatio n water, and the irr igation interv als corres­ pon ding to the differen t irrigation tr eatments were calculat ed . The soil­ water properties and interrel at ionshi p were mea sur ed in field and laborat­ ory . The flood irri gati on syste m (basin meth od ) was applied for irrig ati on. Th e main co nclusio ns of th e stud y are th at , the irrigation levels have a highly signif icant effect on the crop dry yield than th at of th e oth er plant var­ iabl es. Meanwhile , the cro p yield is increase d as the applied depl etion per­ cent age is de creased .