Effect of Irrigation Water Salinity with Constant Turbidity on Soil Moisture Characteristic Curve

آب و خاک

Article 10, Volume 27, Issue 4, September 2013, Pages 763-768   

Document Type: Research Article

DOI: 10.22067/jsw.v0i0.28136

Authors

I. Nikravesh^* ; Hadi Moazed¹; S. Broomandnasab; AbdAli Naseri²

¹Shahid Chamran University of Ahvaz, Iran

²Shahid Chamran University, Ahwaz

Abstract

Many of irrigated agriculture problems are resulting from chemical and physical composition of irrigation water. The irrigation water quality is effective on soil moisture characteristic curve by effect on soil structure, pore size distribution and continuity of them. The aim of this study was to evaluate the effect of different water salinity in the presence of constant turbidity on the soil moisture curve. The salinity treatments at five levels (1, 2, 4, 6 and 8 dS/m) with constant turbidity (200 NTU) were applied. These treatments were investigated at three depths of soil (0 to 15, 15 to 30 and 30 to 45 cm) with a silt-loam texture with three replications in a randomized complete block design. Soil water retention curve was determined by using pressure plate method. The results were statistically analyzed with MSTATC software. The results showed that the water percent of the soil of S2, S3, S4, S5 treatments of irrigation water quality increased to values 13.65, 20.20, 23 and 30 percent compared to S1 treatment. Comparison of water percent of soil at various depths showed that the depth of the second and third compared to the first decreased to 1.40 and 2 percent.

Keywords

Irrigation water salinity; Soil water retention curve; Turbidity