PJB-2022-156
Nitrogen Fertilizer Promoting Salt Tolerance of Sorghum Varieties Under Different Salt Compositions
Aboagla Mohammed Ibrahim Elsiddig
Abstract
Soil salinization is more aggravating than ever before and techniques are needed to mitigate this problem; understanding salinity-fertilizer relationship is of considerable economic importance for promoting crop growth and productivity in saline soil. A pot experiment was done in a greenhouse to determine whether the nitrogen (N) could alleviate the negative effect of different salts compositions on the growth, and physiological attributes of the two most used Sudanese sorghum varieties (Wadahmed and Tabat). The plant was subjected to the salt stress at 0, 4g NaCl, and 4 g Na2SO4 kg-1 dry soil, and four levels of Nitrogen application 0, 45,90, and 135 kg N ha-1, designated as 0N, 1N, 2N, and N3, respectively. Results showed that Na2SO4 was reduced plant height, leaf area index, number of leaf, dry weight (DW), Chlorophyll a, total chlorophyll content, and increased soluble protein content, activities of peroxidase (POD) and catalase (CAT) activities by 16.4%, 29.7%, 61.5%, 28.7%, 39.6%,12.7%, 99.7%, 34.3%, 51.8%, respectively, when compared with the non-saline treatment. The Na2SO4 salt had a more harmful effect than NaCl. This study revealed that nitrogen fertilizer was successful for alleviating the adverse impacts of both types of salt. In this study,135 kg -1 ha was most effective on most of the measured parameters of two sorghum varieties. These findings demonstrated that the nitrogen soil amendment application could alleviate the harmful impact of salinity. ‘Wadahmed’ was more tolerant to salinity stress than ‘Tabat’ during the boot stage of sorghum plant.
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