Improvement of saline soil by planting Suaeda salsa and adding nitrogenous and phosphate fertilizers in the northern Jiangsu Province

The complete randomized bloc design was used to determine the effectiveness of planting Suaeda salsa and adding nitrogenous and phosphate fertilizers on saline soil in the northern Jiangsu Province of China and distribution of K+ and Na+ concentrations in S.salsa and biomass. The results of this study showed that planting S. salsa improved the condition of watersalt at 0~20 cm layer when compared to bare land. Na+ concentration in leaves of S. salsa was higher than the other organs while K+ concentration was higher in roots when nitrogenous and phosphate fertilizers were added into soil. The application of nitrogenous and phosphate fertilizers significantly increased the biomass of S. salsa and interactions between nitrogen and phosphorus were found. The correlations analysis showed that the total biomass of S.salsa was significantly positive related to soil salinity at 0~20 cm layer (P0.01), but was not related to soil salinity at 20~40 cm layer. This study suggested that application of nitrogenous and phosphate fertilizers improved the soil salinity, increased the biomass and affected distribution of K+ and Na+ in S.salsa.