The Effect of Emitters Discharge and Alternation of Irrigation water Slanity on some soil properties and Growth of Corn plant ( Zea Mays L.) 1- Drip irrigation efficiency , Water Use Efficiency(WUE) and plant growth

Abstract

This study was conducted in the field of Agricultural collage . university of Basra ,in karmat-ALl during the spring season 2009 in clay soil in order to investigate the effect of alternation of emitter discharge and irrigation water salinity by using drip irrigation system on some of vertical and horizontal water movement in soil Two emitter's discharge were used , Low discharge (L) (2.O L h -1) and high discharge (H) ( 10 L h -1 ). By using saline water(S) 5.5-6.O dS m -1 and Low saline water ( F ) 2.O- 2.2 dS m-1. These treatments were compined together to do 9 selective treatmeats combination as :- SL , 3SL – FL ,2SL-FL, SL-FL , SL-SH , 3SL-FH , 2SL-FH ,SL-FH, FL-FH , under irrigation level 100% Epan and leaching requirement of 20% .The experiment was designed by Randomized complete Block design (R.C.B.D) with three or replicates . The results of this study my summarized as follows : 1- Water use efficiency was increased under HED'S treatment and low saline irrigation water ,the values were 0.370 , 0.352 , 0.334 , 0.318 , 0.303 kg .cm-1 for FL-FH , SL-FH ,2SL-FH , 3SL-FH , SL-SH ; and 0.254 , 0.269,.0.277,0.277,0.289 kg .cm-1 FOR SL, 3SL-FL , 2SL-FL , SL-FL respectively .2-The result showed the Significantly increasing in dry weight and corn cob weights were shown under the HED compared with LOD'S treatments , and the values increased with increasing the percentage of using low saline irrigation water