Enga M. Niel( 2021). Application of Different Gypsum Sources as Soil Amendments to Improve Some Salt Affected Soils PropertiesWorld Journal of Agricultural Sciences 17 (2): 133-140, 2021
ISSN 1817-3047
Abstract: Salinity considered being an important for agricultural production in semi-arid regions. A field experiment was conducted on saline affected soil in El-Hussania area, Egypt, during the 2019 growing season. The aim of the experiment was to study the effect of by products gypsum (phosphogypsum and sulphugypsum) and natural one applied at two rates (15 and 30 Mg ha 1) on some soil properties, growth, yield and yield components of rice (Oryza sativa L., Giza 177cv) in newly reclaimed soil. The obtained results showed some differences in soil bulk density, electrical conductivity (EC), pH, exchangeable Ca2+ and Sodium Adsorption Ratio (SAR) among the treatments in comparison with the control. Among the treatments, the highest reduction in SAR (18.75 mmol l 1) 1/2 and EC (7.20 dSm 1) were recorded by the phosphogypsum. The obtained data reveal that the applied gypsum-rates significantly increased yield attributes of rice. However, gypsum-rate of 30 t ha resulted in relative increase percentages for grain panicle-1 reached 1 46.8% over the control treatment. With increasing phosphogypsum levels from 15 Mg ha 1 to 30 Mg ha 1, the yield components increased 22.3 and 30.6% for 1000-grain weight respectively, compared with the control. Among the gypsum sources, phospho-, sulpho- and natural gypsum gave pronounced increases in seed yield of rice 20.7, 58.6 and 77.2 %, respectively. This means that phosphogypsum is considered the best gypsum source from soil productivity point of view, followed by sulpho- and natural gypsum for rice plants. Under the current experimental conditions, it could be concluded that application of 30 Mg ha1 to rice plants grown on a salt affected soil was necessary to realize an optimum productivity. As for the applied different gypsum-sources, it is noteworthy to mention that although phosphogypsum was not only promising in terms of productivity and best soil properties but also it represents a better option from the applicable point of view as compared to sulpho- and natural gypsum, this is mainly due to its relative cheap costs.
Keywords: (Phosphogypsum Sulphuregypsum Gypsum Salt affected soil properties)
