期刊
COMMUNICATIONS IN SOIL SCIENCE AND PLANT ANALYSIS
卷 46, 期 9, 页码 1112-1122出版社
TAYLOR & FRANCIS INC
DOI: 10.1080/00103624.2015.1018528
关键词
reclamation; gypsum; saline-sodic; Egypt
In Egypt, improving salt-affected soils is important for ensuring secure agricultural productivity. Gypsum is commonly used for the reclamation of saline-sodic and sodic soils. Soil column experiments were conducted to investigate the effect of gypsum, ground to varying degrees of fineness, on the reclamation of clayey saline-sodic soils. The soil used was obtained from Gelbana Village in the Sahl El-Tina Plain, Sinai Governorate, Egypt. Three different degrees of gypsum fineness (<0.5, 0.5-1, and 1.0-2.0mm) were tested, and the following treatments were included: control (leaching with no gypsum addition), fine particles (<0.5mm), medium particles (0.5-1.0mm), and coarse particles (1.0-2.0mm). The gypsum requirement (GR) to reduce the initial ESP from 29.8 to 10 percent was calculated for the 30-cm soil matrix. The application of gypsum and the subsequent leaching enhanced the reclamation and decreased the salinity as well as the sodicity. With greater fineness of the gypsum particles, a greater decrease in salinity as well as sodicity was obtained. This study suggests that, for greater reclamation efficiency, the gypsum used in the reclamation of saline-sodic soils should be of fine particle size.
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