تقدير الاستهلاك المائي لمحصول الحنطة ( صنف أبو غريب )‎ بطريقة المساريب و بمعادلتي فاو بينمان-مونتيث و حوض التبخر صنف A

الملخص EN

The Consumptive Use values of Abu-Greab(Triticum Astivum)have bean measured by using Lysimeter method at one of the farms of Agriculture and forestry collage/mosul university.Also the Consumptive Use values have bean estimated by using Class A Pan (C.A.P.) and FAO Penman Montieth (2005) for both grass and alfalfa as a reference crops.Three irrigation treatments were choosen,the first was irrigated by the rainfall only(t1),the second was irrigated completely(t2) and the third one was irrigated by using deficit irrigation(t3).The C.A.P.

method gave higher Consumptive Use values when compared with other methods.

The Consumptive Usee values of the(t2)gave the following order C.A.

P.

> FAO-PMAlfalfa > FAO-PMGrass > lysymeter.

While the Consumptive Use values of the(t3)gave C.A.

P.

> FAO-PMGrass > FAO-PMAlfalfa > lysimeter.

FAO-PMGrass equation gave close values to the Lysimeter for the second treatment and the difference between them was 3%,however the FAO-PMAlfalfa equation gave close values to the Lysimeter when deficit irrigation was use for the third treatment and the difference between them was 9%.the complete irrigation treatment(t2)gave higher values for all methods.The yield values for the t2 and t3 were(2445 and 1550) Kg.h-1 respectively,while the first treatment didn’t give any yield because of the very low precipitation which was 94 mm during the season(2007-2008).The deficit irrigation treatment gave higher water use efficiency when the Consumptive Use was measured by Lysimeter and FAO-PMAlfalfa while the water use efficiency decreased when the Consumptive Use was measured by FAO-PMGrass and C.A.

P.

The values of the yield response factor(Ky)increased more than one when the Consumptive Use was measured by FAO-PMGrass and C.A.

P.

however this values decreased less than one when the Consumptive Use was measured by Lysimeter and FAO-PMAlfalfa