| A field plot experiment was conducted. Six treatments were set up: control (CK), aluminum sulfate (L), cow manure (N), fulvic acid (H), aluminum sulfate combined with cow manure (LN), and aluminum sulfate combined with fulvic acid (LH). Soil samples were collected before planting and after harvest to measure the concentration of exchangeable sodium ions, pH, organic matter, available phosphorus, and other properties. Plant height and tiller number of rice were measured at the tillering, jointing, booting, and maturity stages. Aboveground dry matter and grain yield were measured at the maturity stage.The results showed that all five amendments increased soil total porosity and improved soil physical properties. They significantly reduced soil pH and significantly increased soil electrical conductivity (EC), as well as the contents of soil available phosphorus and available potassium. After application of the amendments, the contents of SO24 and Na+ in the soil increased, while the contents of Cl- and Ca2+ decreased. The type of soluble salts in the soil changed from sodic type to sulfate type. The tiller number of rice increased by 0.7% to 7.9%, aboveground dry matter increased by 20.0% to 47.9%, and grain yield increased by 9.1% to 23.4%. Comprehensive analysis shows that the LH amendment is the most effective in improving soil physicochemical properties and increasing crop yield. |
