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1 / / / ( : / : ) ( ) (E 3 ) % (E 2 ) % (E 1 ) % (E 0 ) (E 4 ) :. nebrhimipk@yhoo.com : :

2 / / / ET m. m y 1 n y m K = y = 1 m ET n= 1 1 ET m Y ET 1 = ( 1 ) Ym ETm : :() FAO ( ).( ).() ).(.( ) ( ).( ).( ).( ).( )...() ETp ETm.( ).().( ).() " " " ".() :() ( 1 Ky ) y ETy = + Ky ym ETm y ETy = 1 = 1 ym ETm ET y y m y

3 ..... ETc = I + R D ± (Sw1 Sw 2) : I () ETc D () R () Sw 1 () Sw 2 (). () ( ).... Minitb..().( ).().(). ' '.. ) E0 E3 E1 ( ) E4 ( ). ( :T3 :T2 :T1 :T6 :T5 :T4...

4 / / /. () FC ( ) PWP ( ) ρ b ( ). (mg/l) (mg/l) (%) (%) (%) (ph) (ds/m) (cm) : ET=ETm ET Y if = 1 1 = Ky ( 1 1) = Y = Ym ETm Ym ET 0 1 ET m : ETy Y ETy 0 < < 1 1 = 1. ETm Ym ETm y 1 y K m y = ETy 1 ET m..( ) % " ". SPSS..().( ).( ). : y ET 1 = 1 ym ETm

5 (% ). / / / / / ns / / / % % ns ns / / ns ns ns ns ns ns / / / / / ns ns ns ns ns ns / / / / / / / / / / / / / / / :ns IAEA. FAO E3 E2 E1 ( ) FAO..() ). (.( ).. E4 E1. / E4 E3 E1 E 4 E 0 ( ).( ). / /... /. / ). (. ( )

6 / / / ( ). (%) () (%) ( ) ) ( / E 0 T 1 / / b b E 1 T 1 / / / b b b b E 2 T 1 E 3 T 1 b b E 4 T 1 / E 0 T 2 / b E 1 T 2 / b b E 2 T 2 / b b E 3 T 2 b bc E 4 T 2 E 0 T 3 b b E 1 T 3 / b b E 2 T 3 c c E 3 T 3 c d E 4 T 3 c E 0 T 4 c b b E 1 T 4 c b bc E 2 T 4 b b c E 3 T 4 c d E 4 T 4 E 0 T 5 b E 1 T 5 c E 2 T 5 b b cd E 3 T 5 b b d E 4 T 5 E 0 T 6 / / b b bc E 1 T 6 E 2 T 6 b c E 3 T 6 / / cd E 4 T 6

7 . E 1 E 2 E 3 E 4./ FAO IAEA (Chile) IAEA. C... ET d : 2 Yr = ( E T d ) + b ( E T d ) + c Yr ( ) ET d c b.... E 4.. E 1.. : % E T 2 E T Y = Ym A ( ) + B ( ) + c ) E Tm E Tm B A Ym Y

8 / / /. / A B C R 2./ (ET d ) () (Y r ). / / / A B C R 2 E 4. E Arkley, R. J Reltionship between plnt growth nd trnspirtion. Hilgrdi 34: Asdi, H., M. R. Neishboori nd H. Sidt Evluting the whet response fctor to wter (Ky) in different growth stges in Krj. Irnin Journl of Agriculturl Science 34(3): (In Frsi). 3. Bgbnzdeh Dezfuli, B Crop coefficient estimtes of the brley (Str) nd the production function. MSc. Thesis, Trbit Modres University, Tehrn, Irn. (In Frsi). 4. Debeke, P., J. Puech nd M. L. Csls Yield build up in winter whet under soil wter deficit. I. Lysimeter studies. Agronomie J. 16: Dewit, C. T Trnspirtion nd crop yields. Institute vor biologisch en scheikundig nd erzook vn lnd bu wge wssen, Versel, lnd bouskd, on derz, 64.6 Wgeningen, The Netherlnds. 6. Dirk, R Yield Response to Wter.Kuleuen Fculty of Agriculturl nd Applied Biologicl Sciences,Deprtment of lnd mngement, Lbortory of Soil nd Wter Mngement, drk.res@gr.kuleuen.c.bc 7. Donldson, E Crop trits for wter stress tolernce. Americn Journl of Alterntive Agriculture 11(23): 8494.

9 8. Doorenbos, J. nd A. H. Kssm Yield Response to Wter. FAO, Irrigtion nd Dringe Pper No. 33, Rome, Itly. 9. Ebrhimipk, N. A Modeling crops yield under deficit irrigtion. PhD Thesis, Islmic Azd University, Science nd Reserch Brnch, Tehrn, Irn. (In Frsi). 10. Fischer, R. A Number of kernels in whet crops nd the influence of solr rdition nd temperture. Journl of Agriculturl Science 108: Hnks, R. J Model for predicting plnt yield s influenced by wter use. Agronomy Journl 66(5): Hnks, R. J. nd V. P. Rsmussen Predicting crop production s relted to plnt wter stress. Advnces in Agronomy 35: Hiler, E. A. nd R. N. Clrk Stress dy index to chrcterize effects of wter stress nd crop yields. Trnsctions of ASAE 14: IAEA Nucler techniques to ssess irrigtion schedules for field crops. IAEA TECDOC 888, Vienn. 15. Jensen, M. E Wter consumption by griculturl plnts. In: Kozlowski, T. T. (Ed.), Wter Deficits nd Plnt Growth, 11: 122, Acdemic Press, N. Y. 16. Kipkorir, E. C. nd D. Res Trnsformtion of yield response fctor into Jensen's sensitivity index. Irrigtion nd Dringe Systems 16: Mchdo, E. C., A. M. Lgo nd A. Ticelli Sourcesink reltionships in whet subjected to wter stress during three productive stges. Revist Brsileir de Fisiologi Vegetl 5(2): McMster, G. S., W. Wilhelm nd P. N. S. Brtling Irrigtion nd culm contribution to yield nd yield components of winter whet. Publictions from USDAARS/UNL Fculty, Pper Minhs, B. S., K. S. Prikh nd T. N. Srinivsn Towrd the structure of production function for whet yields with dted inputs of irrigtion wter. Wter Resources Reserch 10: Moutonnet, P Yield response fctors of field crops to deficit irrigtion. FAO Irrigtion nd Dringe Pper No. 22, Rome, Itly. 21. Nirizi, S. nd J. R. Rydzewski Effects of dted soil moisture stress on crop yield. Experimentl Agriculture 13: Reynolds, M. P., B. Skovmnd, R. M. Trethown, R. P. Singh nd M. Vn Ginkel Applying physiologicl strtegies to whet breeding. Reserch Highlights of the CIMMYT whet progrm, , pp Robertson, M. J. nd F. Guint Responses of spring whet exposed to prenthesis wter stress. Austrlin Journl of Agriculturl Reserch 45: Robins, J. S. nd D. E. Doming Moisture nd nitrogen effects on irrigted spring whet. Agronomy J. 54: Slter, P. J. nd J. E. Goode Crop responses to wter t different stges of growth. Res. Rev. 2 Commonw. Bur. Hon. Plnttion Crops, 256 p. 26. Singh, S. D Optimum utiliztion of limited wter supply. PP In: Desertifiction nd Control, Indin Council of Agriculturl Reserch, New Delhi. 27. Singh, S. D Moisture sensitive growth stges of dwrf whet nd optiml sequencing of evpotrnspirtion deficits. Agronomy Journl 73: Shurong, L. nd L. Go Wter deficit sensitivity index for spring whet in rid nd semi rid res of inner Mongoli. Proceedings of 99 th Intl. Conf. on Agric. Eng., Vienn. 29. Stewrt, J. I., R. H. Cuenc, W. O. Pruitt, R. H. Hgn nd T. Tosso Determintion nd utiliztion of wter production functions for principl Cliforni crops. W79 Clif. Contrib. Proj. Rep. University of Cliforni, Dvis. 30. Zre Fizbd, A. nd M.Ghodsi Evlution of drought tolernce of whet lines in cold regions of the country. Irnin Journl of Agriculturl Science 16(2): (In Frsi).