| To explore the regulation effect of different soil amendments combined with planting oats and halophytes on soil fertility in saline-alkali land, and to screen out the comprehensive management measures suitable for soil conditions in Hexi saline-alkali land, so as to provide theoretical basis and technical reference for the management of saline-alkali land in inland arid areas of Northwest China. [Method] From April to October 2023, based on the field two - factor split-plot experimental design, the effects of single and combined application of different organic modifiers (organic fertilizer, fly ash, biochar, furfural residue, vermicompost, humic acid) on the nitrogen, phosphorus and potassium nutrient status of oat grass and halophyte soil in saline-alkali land were compared. [Result] The results showed that the pH value and EC value of saline-alkali soil were significant reduced by the application of single modifier and the application of other modifiers mixed with furfural residue. The EC value of oat field and saline grass field significant decreased by 5.81 % - 46.71 % and 9.47 % - 35.83 % respectively after the application of single modifier. Single application of organic fertilizer, humic acid, fly ash treatment and furfural residue mixed with fly ash and biochar, humic acid mixed with vermicompost and biochar can increase soil organic matter, ammonium nitrogen, available phosphorus and available potassium content. The soil nitrate nitrogen content showed that the single application of fly ash in oat field significantly increased by 26.45 % compared with no amendment, and the single application of biochar in saline grassland significantly increased by 0.86 %. At the same time, the single application of amendments significantly increased the yield of halophytes by 3.69 % - 41.73 %, and the mixed application of amendments increased the yield of oat grass more significantly than the single application. [Conclusion] Planting oats combined with single application or mixed application of soil amendments, planting halophytes combined with single application of soil amendments can increase available nutrients in saline-alkali land, improve soil fertility in saline-alkali land, and increase their productivity. |