The Effects of Organic Matter, Gypsum and Leaching on Physico-chemical Properties of a Sodic Soil

Document Type : Research Paper


1 Former M.Sc. Student, Department of Soil Science, College of Agriculture, Zanjan University, Zanjan, Iran

2 Professor, Department of Soil Science, College of Agriculture, Zanjan University, Zanjan, Iran

3 Ph.D. Student, Department of Soil Science, College of Agriculture, Zanjan University, Zanjan, Iran


In order to investigate the effects of different levels of gypsum (0, 50 and 100% gypsum requirement), organic matter (1.5 and 3% w/w organic carbon) from different sources (alfalfa residue, corn residue, date waste and saw dust) and leaching on the physico-chemical properties of a sodic soil, a factorial experiment was conducted in a greenhouse using a completely randomized design with three replicates. The results showed that the application of gypsum improved the sodic soil properties, before and after the leaching. However, the application of organic matter slightly increased sodium adsorption ratio, exchangeable sodium percentage and the percentage of dispersible clay measured before leaching. But after leaching, these characteristics were decreased significantly as compared to the control. The application of organic matter together with gypsum, especially the application of 3% date waste with gypsum, improved the properties of the sodic soil after the leaching more effectively than the application of gypsum and organic matter separately.


Main Subjects

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