Journal of Water and Soil Vol. 26, No. 6, Jan.-Feb. 2013, p (

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1 Journl of Wter nd Soil Vol. 26, No. 6, Jn.-Feb. 2013, p ( ) * /2/4 : 1391/8/28 : ( ) : ( 50 ) ( 75 ). ( ) ( ) ) 2/13 1/16. (. ( 14 ) :...(9). 25.(22) (15) /87.(8). (WUE) -4 1 ( Emil: rezei@mil.uk.c.ir : -*) -3 2

2 (2) 7/9 ph ds/m 2/11 EC e.(6) ( ) ). (. 18 ) 75 : ( 75 M1) ( 75T) ) 50 (( 75M2) ( 50M1) ( 50T) 50.(( 50M2) (CM1) (CT) ) 50 ((CM2) ).((D1T) (D1T) (D1T) 50 (D2T) ) ((D2M2) (D2M1) 50 (D3T) ) 3 ((D3M2) (D3M1) /2/ ( ) (20)..(1) 1/4 ( ) (PRD) (19).(14 13)..(11)..(16) (21) -.(17) (704 ) (Ze mys L.) / /1 17/ Prtil rootzone drying

3 :3 - : /75 ( 32/2) 35 ( 50)... ( ). ). ( ( ) : ) SAS(ver.9.1).(. Excel :1. ( 50 75). :2.. ( ) (kg.m -3 ) 0/21 0/29 0/0 0/01 0/1 0/24 0/24 32/ / / / / / / /2 31/ / / / / /36 (cm) * / / / / /9 369/ * /14 * / / / / / / / /98 27/09 11/76 c.v :ns *

4 ) ( (kg.m -3 ) 1/16 1/67 b 1/15 1/23 1/60 1/28 1/32 1/86 1/69 1/50 2/13 1/34 1/66 1/68 1/65 b 0/98 1/83 1/32 b 0/ c c c c c bc c e bc bcd c c c b 9498 c b 8896 c c * cd e (cm) cd 190/33 bf 172/83 bf /33 ef 145/75 f 167/83 f 176/5 * S 75T 75M1 75M2 50T 50M1 50M2 c c 204/17 CT f 156/5 CM CM2 e ef 148/5 D1T f 155/5 D1M /5 D1M f 161/83 D2T c /17 D2M1 cd c 204 D2M2 e ef 147/17 D3T ef 147/33 D3M1 b /5 D3M " : (12) ". 80. Y=43/909 W /8 W :W :Y (3). (cm) ( 6697/5) R Y : Y * X. (cm) X (cm) (10) " :. " ( 61 )

5 " " (17) ). ( (7) SAS (ver.9.1) ).. ( 3/5 7/7. 16/9. 2/13 0/ /16. ( 50 ). 1. ( 50) ) 1 (.. (15) ( 69 ) :Y Y=12/938 W W (cm) :W /25 (5) ). ( ) ( 22 ) /5 (.. ) (17) 10/79 ±0/74 ( (PRD50) /61±0/17. 8/3±0/08 (DI50) ( 14 ) 7163 ( 40/8 )

6 (kg.m -3 ) ( ) -1.. :. ( 14 ) " " " : " :(2) :(50)13.( ) :(6) :(3) :(2)

7 :(2) ( ) Ckir R Effect of wter stress t different velopment stges on vegettive nd reproductive growth of corn. Field Crops Reserch 89: Dvies W.J., nd Zhng J Root signls nd the regultion of growth nd velopment of plnts in drying soil. Annul Review of Plnt Physiology nd Plnt Moleculr Biology. 42: Edmes G.O., Bolnos G., Hernnz M., nd Bello S Cuses for silk ly in lowind tropicl mize popultion. Crop Sci.33: Hn Y.L., nd Kng S.Z Effects of the controlled prtil rootzone irrigtion on root nutrition uptke of mize (Ze mys L.). Trns. Of Chinese Sco. Agric. Eng. (in Chinese) 18(1): Jovnovic Z., Stikic R., Vucelic-Rdovic B., Pukovic M., Brocic Z., Mtovic G., Rovcnin S., nd Mojevic M "prtil root-zone drying increses WUE, N nd ntioxidnt content in field pottoes." Europ. J. Agronomy 33: Kng S., Ling Z., Pn Y., Shi P., nd Zhng J Alternte furrow irrigtion for mize production in n rid re. Agric. Wt. Mnge. 45: Kird C Deficit irrigtion scheduling bsed on plnt growth stges showing wter stress tolernce. PP in: FAO, Wter Reports No: 22, Deficit Irrigtion Prctices Kird C., Topcu S., Kmn H., Ulger A.C., Yzici A., Cetin M., nd Derici M.R Grin yield response nd N-fertiliser recovery of mize unr ficit irrigtion. Field Crops Reserch 93: Roost H.R., Shhnzri A., nd Nzri F Comprtive effects of conventionl irrigtion (CI) nd prtil root zone drying (PRD), nd vrious sources of nitrogen on growth nd yield in potto unr field condition. Am. Eursin J. Sustin. Agric. 3(4): Sepskhh A.R., nd Khjehdollhi M.H Alternte Furrow Irrigtion with Different Irrigtion Intervls for Mize (ze mys L.). Plnt Prod. Sci. 8(5): Sepskhh A.R., nd Prnd A.R Effects of Alternte Furrow Irrigtion with Supplementl Every-Furrow Irrigtion t Different Growth Stges on the Yield of Mize (Ze mys L.). Plnt Prod. Sci. 9(4): Tesfye S.G., Rzi I.M., nd Mzih M Effects of ficit irrigtion nd prtil rootzone drying on growth, dry mtter prtitioning nd wter use efficiency in young coffee (Coffee ric L.) plnts. Journl of Food, Agriculture Environment. 6: Trimmer W.L Prtil irrigtion in Pkistn. ASCE, J. Irrig. nd Drin. Eng, 116(3):

8 Journl of Wter nd Soil... Vol. 26, No. 6, Jn.-Feb. 2013, p ( ) Effect of Deficit Irrigtion nd Prtil Rootzone Drying on Yield, Yield Components nd Wter use efficiency of mize (Ze mys L.) SC 704. A. Rezei Estkhroeih 1 - A. Hooshmnd 2 - S.Bromnd Ns 3 - M.J. Khnjni 4 Received: Accepted: Abstrct Deficit irrigtion is n optimiztion strtegy for wter use efficiency in irrigtion. This reserch ws conducted to evlution effect of ficit irrigtion (DI) nd prtil root zone drying (PRD) on yield, yield components nd wter use efficiency of corn. Reserch ws conducted on Shhid Bhonr University of Kermn in the spring of 2010 using completely rndomized block sign with one control, 18 ficit irrigtion tretment nd three blocks. Deficit irrigtion tretments were includ: mild wter stress (irrigtion with 75 ETP), high wter stress (irrigtion with %50 ETP), fixed every other furrow irrigtion nd three prtil root zone drying (Chnge the wet furrows in every irrigtion, Chnge the wet furrows in every other irrigtion nd chnge the wet furrows in every second irrigtions). Every tretment ws pplied t three growth stges of corn (ll periods of growth, vegettive growth stge nd reproductive growth stge). The highest biologicl yield obtined nd the lowest ws kg per hectre. The highest grin yield ws kg per hectre nd the lowest ws Wter use efficiency (km grin yield per cubic meter of wter) for the control tretment ws equl to 1.16 nd for prtil root zone drying with chnge the wet furrows in every irrigtion (14 dys) in ll periods of growth tretment ws equl to Results showed tht prtil root zone drying with one intervl irrigtion (14-dy) ws the best choice to pply ficit irrigtion on corn. Keywords: Deficit irrigtion, Prtil root zone drying, Corn, Yield, Wter use efficiency 1,4- Assistnt Professor nd Professor, Deprtment of wter Engineering Fculty of Agriculturl, Shhid Bhonr University, Kermn (*-Corresponding Author Emil: rezei@mil.uk.c.ir ) 2,3- Assistnt Professor nd Professor, Deprtment of Wter Engineering, Fculty of Agriculture, Shhid Chmrn University, Ahvz