تاثير آب شور در آبياري تكميلي جو در منطقه گرگان

The effects of saline water in supplementary irrigation of various barley genotypes in Gorgan region

The effect of irrigation water quality on the yields of barley was studied in a silty soil. This study was carried out in Woshmgir dam in Golestan province, in 1988 - 1999. The experiment included three salinity levels treatments, 12 and I3 with .76, 5 and 10 dS/m respectively, which is mixed from non-saline (fresh) and saline (drainage) water. The other factors were imposed with 8 different genotypes of barley. The design of experiment was strip plot with 4 replications. The results showed that the yield of genotypes was decreased due to apply of saline water, but the grain yield of different genotypes was considerable, except one genotype. The average maximum grain yield was obtained at treatment 1, (4288 kg/ha). The lowest grain yield was obtained at treatment I3 (3859 kg/ha).The analysis of soil samples during 2 years indicated that application of saline water (10 dS/m) increased the soil saturation paste extract (ECe) from 1.4 to 5.3 dS/m in the surface layer (0-30 cm) and from 2.4 to 3 dS/m in the subsurface layer (30-60 cm).