Effect of different mulches on evaporation reduction and salinity changes in soils with different texture

Document Type : Original Article

Authors

1 Assistant Prof., National Salinity Research Center, Agricultural Research, Education and Extension Organization (AREEO), Yazd, Iran

2 Assistant Prof., Department of Soil Science and Engineering, Faculty of Agriculture University of Tabriz, Tabriz, Iran

Abstract

Reducing irrigation losses due to surface evaporation using mulch layer on soil surface can help in maintaining water in the current situation that our country is suffering from water deficit. In this research, the effect three types of mulch layer on evaporation reduction was evaluated on three soil textures (sandy loam, loam and clay loam). For this purpose, a layer of three centimeters mulches (water repellent layer, fine gravel and manure) was placed on the soil surface, and their effect and control (without mulch layers) on the evaporation rate of small lysimeters in Yazd city was investigated. The experiments were performed in a in a factorial experiment with completely randomized design with four treatments and three replications. The results showed that the surface mulch layer significantly decreased evaporation in the mentioned three soils. The maximum evaporation reduction in fine gravel layer compared to the control was 59.8, 58.2 and 61.4% in the sandy loam, loam and clay loam soil, respectively. After fine gravel, the manure was more effective than the water repellent layer mulch in evaporation reduction. The effect of mulches on salinity changes in soil depth was different, so that the lowest amount of salinity was observed in the treatment of fine gravel and manure mulches on the surface of the three soils. Water repellent mulch had less effect on reducing the salinity of topsoil than the other two mulches and more salts were transferred from the depth to the soil surface.

Keywords

References

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Iranian Journal of Irrigation & Drainage
Volume 15, Issue 3 - Serial Number 87
July and August 2021
Pages 558-566

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