ABSTRACT

Release of silicon (Si) from different Si sources and Si budgeting in varied types of soils are required for the exploration of sustainable rice production. Si products are shown to be effective in improving crop growth and yield; however, its reactivity differs based on the soil type. A pot experiment was conducted by using three Si sources (calcium silicate (CaSiO₃), diatomaceous earth (DE), and rice husk biochar (RHB)) in acidic, neutral, and alkaline soils under rice planted and unplanted conditions for a single season. A large variation in Si uptake by rice existed amongst the different sources of Si and was found to be higher in neutral soil followed by acidic and alkaline soil. Application of calcium silicate followed by diatomaceous earth recorded higher Si uptake in acidic (547.17 ± 39.15 mg pot⁻¹) and neutral (632.65 ± 112.21 mg pot⁻¹) soil whereas, rice husk biochar in alkaline soil (35.32 ± 4.60 mg pot⁻¹). Application of calcium silicate and RHB significantly increased the plant available Si in post experimental soil. The soil solution pH of acidic, neutral and alkaline soils ranged from 5.62– 8.59, 6.62– 9.13, and 7.64– 9.37, respectively, with the application of different rates and sources of Si during the experimental period. The application of CaSiO₃ followed by RHB increased the dissolved Si in acidic and neutral soil whereas RHB and DE in alkaline soil. The amount of DSi with the application of different sources and levels of Si ranged from 47– 447, 139– 751, and 161– 374 µmol L⁻¹ in acidic, neutral, and alkaline soil, respectively. About 16 to 28% of Si in acidic and neutral soil and 10 to 19% Si in alkaline soil was accounted by irrigation water.

摘要

探索可持续水稻生产需要从不同的 Si 来源释放硅 (Si) 并在不同类型的土壤中进行 Si 预算。硅产品被证明可有效改善作物生长和产量；然而，其反应性因土壤类型而异。使用三种硅源（硅酸钙（CaSiO ₃）、硅藻土（DE）和稻壳生物炭（RHB））在水稻种植和未种植条件下的酸性、中性和碱性土壤中进行单季盆栽试验. 水稻对硅的吸收在不同来源的硅中存在很大差异，发现在中性土壤中较高，其次是酸性和碱性土壤。硅酸钙和硅藻土的应用记录了在酸性 (547.17 ± 39.15 毫克罐) 中更高的硅吸收^-1 ) 和中性 (632.65 ± 112.21 mg pot ^-1 ) 土壤，而碱性土壤中的稻壳生物炭 (35.32 ± 4.60 mg pot ^-1 )。硅酸钙和RHB的施用显着增加了试验后土壤中植物有效硅。酸性、中性和碱性土壤的土壤溶液 pH 值范围分别为 5.62-8.59、6.62-9.13 和 7.64-9.37，在实验期间应用不同的硅含量和来源。CaSiO ₃和RHB的施用增加了酸性和中性土壤中溶解的Si，而RHB和DE在碱性土壤中增加。应用不同来源和 Si 水平的 DSi 量范围为 47– 447、139– 751 和 161– 374 µmol L ^-1分别在酸性、中性和碱性土壤中。酸性和中性土壤中约 16% 至 28% 的硅和碱性土壤中约 10% 至 19% 的硅被灌溉水所占据。