ABSTRACT

An in-depth knowledge on impact of integrated nutrient management (INM) practice on yield sustainability and soil quality is important to scale INM practice across regions. Therefore, field experiment was initiated in 2006, which consisted of five treatments: absolute control, 100% recommended doses of nitrogen (N), phosphorus (P) and potassium (K) (RDF), 50% recommended doses of NP + 100% K + biofertilizers, 50% recommended doses of NP + 100% K + 1 t ha⁻¹ enriched compost (ECM) and 25% recommended doses of NP + 100% K + 2 t ha⁻¹ ECM (25RDF + 2ECM). The use of 25RDF + 2ECM increased soil organic carbon by 32 and 24% over control and RDF, respectively, at 0–5 cm soil layer. It also increased soil microbial biomass carbon, microbial phosphorus and phenol oxidase activity by 13.7, 20.9 and 55.7% than RDF, respectively, at 0–5 cm layer. Notably, phenol oxidase activity, pH, DTPA-extractable iron, available K, mineral N and microbial biomass phosphorus came out as the key indicators of soil quality in acidic soil after 10 years. The study recommends that INM practice comprising ECM and reduced inorganic fertilizers could enhance soil quality and yield sustainability of rice in the long-run in acidic soil ecology.

摘要

深入了解综合养分管理 (INM) 实践对产量可持续性和土壤质量的影响对于跨地区扩展 INM 实践非常重要。因此，2006年开始田间试验，田间试验包括5个处理：绝对对照、100%推荐剂量的氮（N）、磷（P）和（K）（RDF）（RDF）、50%推荐剂量的NP+100% K + 生物肥料，50% 推荐剂量的 NP + 100% K + 1 t ha ⁻¹浓缩堆肥 (ECM) 和 25% 推荐剂量的 NP + 100% K + 2 t ha ⁻¹ECM（25RDF + 2ECM）。在 0–5 cm 土层，使用 25RDF + 2ECM 使土壤有机碳分别比对照和 RDF 增加 32% 和 24%。与 RDF 相比，在 0-5 cm 层，它还使土壤微生物生物量碳、微生物磷和酚氧化酶活性分别提高了 13.7%、20.9% 和 55.7%。值得注意的是，酚氧化酶活性、pH 值、DTPA 可提取铁、速效钾、矿物氮和微生物生物量磷成为 10 年后酸性土壤土壤质量的关键指标。该研究建议，包括 ECM 和减少无机肥料在内的 INM 实践可以在酸性土壤生态中长期提高土壤质量和水稻的产量可持续性。