Analytical and laboratory evaluation of the solubility of gypsiferous soils

Subject Areas : Farm water management with the aim of improving irrigation management indicators

aliabbas afsharian ¹ , ناذر عباسی ² , امیر خسروجردی ³ , حسین صدقی ⁴

1 - Water and wastewater company
2 - عضو هیئت علمی موسسه تحقیقات فنی ومهندسی، سازمان تحقیقات، آموزش و ترویج کشاورزی کزج
3 - عضو هیئت علمی گروه علوم ومهندسی آب دانشگاه آزاد اسلامی واحد علوم وتحقیقات تهران
4 - عضو هیئت علمی گروه علوم ومهندسی آب دانشگاه آزاد اسلامی واحد علوم وتحقیقات تهران

Received: 2016-10-09 Accepted : 2017-01-17 Published : 2017-10-23

Keywords: solubility speed, Statistical analysis, hydraulic gradient, gypsum soil,

Abstract :

Gypsum soil is one of the problematic soils because of considerable solubility for gypsum particles in contactwith water. In this research, the effects of three factors including; gypsum percent, hydraulic gradient, and soiltexture were studied on solubility of gypsum soils. To do this, samples of gypsum soils were provided artificiallyby adding various rates of natural gypsum rock including 0, 5, 10, 20 and 30 percent by weight of 3 kinds of soiltextures including clay, silty clay and sand. Totally, 15 types of gypsum soils were prepared. Then each ofgypsum soils were leached under five hydraulic gradients levels 0.5, 1, 2, 5 and 10. The results of the testindicated that the rate of gypsum in the soil has direct effect on the rate of soluble in a way that by increasingpercent of gypsum the rate of solubility was increased. in addition, by increasing hydraulic gradient, the speed ofwater outcome and its amount from soil environment in a specified time was increased and also more rate ofgypsum was derived. The statistical results show the highest impact of gypsum percentage and lowest impact ofhydraulic gradient soil on solubility of particles in different types of soils and it has no significant effect on theoverall equation of the soil texture.

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