تاثير كمية و نمط متطلبات الغسل عند الري بالمياه المالحة في حاصل الذرة الصفراء

EFFECT OF AMOUNT an‎d PATTERN OF LEACHING REQUIREMENT FOR SALINE IRRIGATION WATER ON CORN YIELD

AbstractThe study was conducted for determining the effect of application amount and pattern of leaching requirement for corn (zea mays L.) in fall season in 2007, in the soil and water resources center research station - Ministry of science and Technology. The experimental design was factorial complete randomize block design in three replicates.The main factors were three:- i.Two quality of irrigation water.ii.Two level of leaching requirement application.iii.Two pattern of leaching requirement. Soil chemical characteristics and yield of corn was monitored as affected by irrigation with saline water.Results indicated increasing in values for salinity of soil saturation paste solution for depth (0 – 60 cm) to values 3.7 time in irrigation with saline water without application of leaching requirement comparing with soil irrigated with river water.Using two levels (20 , 40 %) of leaching requirement caused reduction in the values of soil salinity to 30% and 43% comparing with treatment without leaching requirement respectively. Minimum redaction in the yield 14% was occurred in using the second pattern (application of leaching requirement after 50 days from the first application) with 40% level comparing with the yield of irrigation with river water.