ABSTRACT Soil acidity is one of the main limitations for optimal use of land resources for better crop production. And, long-term fertilization experiments found to be helpful in increasing the nutrient supply in these acidic soils. Keeping this in view, a field experiment on rice was carried out by applying biofertilizers and enriched compost in an acidic Inceptisol of Assam over 10 successive years (2006–15) to examine its effects on nutrient availability and soil enzymatic activity. This experiment had five treatments viz. absolute control (T1), 100% recommended doses (RD) of inorganic NPK (T2), 50% RD of inorganic NP + 100% K +biofertilizers (T3), 50% RD of inorganic NP + 100% K +1 tonne enriched compost ha−1 (T4) and 25% RD of inorganic NP + 100% K +2 tonnes enriched compost ha−1 (T5) under randomized block design with four replications. After completing 10 years of experiment, it was observed that integrated use of enriched compost and biofertilizers with reduced doses of inorganic fertilizers enhanced the soil enzymatic activity as well as nutrient availability in rice grown in acidic clay loam soils of Assam. Application of biofertilizers and enriched compost had positive impact on plant accessible nitrogen, phosphorus and potassium in soil as compared to inorganic fertilizers. Also soil organic matter content increased considerably by these treatment. Integrated nutrient management practice in rice had also significantly enhanced the dehydrogenase, fluorescein diacetate and phospho-monoesterase activity in soil.

中文翻译：

---

长期综合养分管理 (INM) 实践对印度东北地区酸性 Inceptisol 土壤养分有效性和酶活性的影响

摘要 土壤酸度是优化利用土地资源以提高作物产量的主要限制因素之一。而且，长期施肥实验发现有助于增加这些酸性土壤的养分供应。考虑到这一点，通过在阿萨姆邦的酸性 Inceptisol 中连续 10 年（2006-15 年）施用生物肥料和浓缩堆肥，对水稻进行了田间试验，以检查其对养分有效性和土壤酶活性的影响。该实验有五个处理，即。绝对控制 (T1)，100% 推荐剂量 (RD) 无机 NPK (T2)，50% RD 无机 NP + 100% K +生物肥料 (T3)，50% RD 无机 NP + 100% K +1 吨富集堆肥 ha-1 (T4) 和 25% RD 无机 NP + 100% K +2 吨富集堆肥 ha-1 (T5) 在随机区组设计下，四次重复。在完成 10 年的试验后，观察到结合使用强化堆肥和生物肥料以及减少无机肥料的剂量可以提高阿萨姆邦酸性粘壤土中种植的水稻的土壤酶活性和养分利用率。与无机肥料相比，生物肥料和浓缩堆肥的应用对土壤中植物可及的氮、磷和钾具有积极影响。通过这些处理，土壤有机质含量也显着增加。水稻综合养分管理实践也显着提高了土壤中的脱氢酶、荧光素二乙酸酯和磷酸单酯酶活性。据观察，在阿萨姆邦酸性粘壤土中种植的水稻中，综合使用强化堆肥和生物肥料并减少无机肥料的用量可提高土壤酶活性和养分利用率。与无机肥料相比，生物肥料和浓缩堆肥的应用对土壤中植物可及的氮、磷和钾具有积极影响。通过这些处理，土壤有机质含量也显着增加。水稻综合养分管理实践也显着提高了土壤中的脱氢酶、荧光素二乙酸酯和磷酸单酯酶活性。据观察，在阿萨姆邦酸性粘壤土中种植的水稻中，综合使用强化堆肥和生物肥料并减少无机肥料的用量可提高土壤酶活性和养分利用率。与无机肥料相比，生物肥料和浓缩堆肥的应用对土壤中植物可及的氮、磷和钾具有积极影响。通过这些处理，土壤有机质含量也显着增加。水稻综合养分管理实践也显着提高了土壤中的脱氢酶、荧光素二乙酸酯和磷酸单酯酶活性。与无机肥料相比，土壤中的磷和钾。通过这些处理，土壤有机质含量也显着增加。水稻综合养分管理实践也显着提高了土壤中的脱氢酶、荧光素二乙酸酯和磷酸单酯酶活性。与无机肥料相比，土壤中的磷和钾。通过这些处理，土壤有机质含量也显着增加。水稻综合养分管理实践也显着提高了土壤中的脱氢酶、荧光素二乙酸酯和磷酸单酯酶活性。