SOIL Studies

SOIL Studies

2012, Vol 1, Num, 1     (Pages: 038-046)

Soil Salinity Changes Due to Different Irrigation Water Salinity and Leaching Fractions

E. Yurtseven 1 ,H. S. Öztürk 2 ,S. Avcı 3 ,S. Altınok 4 ,M. F. Selenay 1

1 Ankara Üniversitesi Ziraat Fakültesi Tarımsal Yapılar ve Sulama Bölümü, Ankara
2 Ankara Üniversitesi Ziraat Fakültesi Toprak Bilimi ve Bitki Besleme Bölümü, Ankara
3 Hacettepe Üniversitesi Hidrojeoloji Bölümü, Ankara
4 Ankara Üniversitesi Ziraat Fakültesi Tarla Bitkileri Bölümü, Ankara

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In this study, soil profile salinity variations were investigated with different irrigation water salinity and leaching fractions in lyzimeters, under the open-rain conditions. Experiments were carried out with three irrigation water salinity levels (0.25, 1.5 ve 3.0 dS/m) and four leaching fractions (%10, 20, 35 ve 50) with three replications, totally in 36 lyzimeters, with fully randomized factorial design. Soil samples were taken out from 0-20, 20-40, 40-60, 60-80 ve 80-100 cm soil depths in monthly basis. Soil salinity were measured in 1:2,5 soil water ratio. Average soil salinities in the profile were not affected significantly from the irrigation water salinity level, but leaching fraction effected the soil salinities. Soil salinity decreased with increasing leaching fraction, and also increased with depth for all treatments. Soil salinities of each layer increased with the increasing salinity level of irrigation water throughout the irrigation period. Variations of some salinity components in the soil profiles which are Cl-, Na+, and Ca+2+Mg+2 were also analyzed. It was faund that Cl- was highly soluble and leached easily from the profiles. In contrary Ca+2, Mg+2 and especially Na+ were not easliy leached and accumulated in the profile even in lyzimeters applied more leaching water.

Keywords : Irrigation water salinity, soil salinity, leaching