ABSTRACT

Applications of enriched compost (ECM) with reduced doses of inorganic fertilizers over ten consecutive years reduced phytotoxic aluminium (Al) fractions, whereas, improved nutritional quality of rice in acid soil. The long-term field trial with integrated nutrient management (INM) practices was initiated in kharif–2006 at Instructional-cum-Research (ICR) farm under rice mono-cropping system. Treatments consisted of T₁; absolute control, T₂; 100% recommended doses of nitrogen (N), phosphorus (P) and potassium (K), T₃; 50% recommended doses of NP + 100% K + biofertilizer, T₄; 50% recommended doses of NP + 100% K + ECM at 1 tonne ha⁻¹ and T₅; 25% recommended doses of NP + 100% K + ECM at 2 tonne ha⁻¹. Exchangeable Al (~31%) and strongly organically bound and interlayer Al (~26%) fractions decreased with an increasing dose of ECM application at all soil depths. However, weakly organically bound Al (~25%), amorphous Al (~7.3%), and free Al (~13%) significantly increased over 100% NPK. Long-term use of ECM had a significant positive impact on micronutrient content in post-harvest soil. Micronutrient accumulation (Zn, Fe, Cu, Mn and Ni) in rice increased with continuous application of manuring and fertilization, while the accumulation of Al decreased significantly.

摘要

连续 10 年施用减少无机肥料剂量的浓缩堆肥 (ECM) 可减少植物毒性铝 (Al) 组分，同时改善酸性土壤中水稻的营养品质。综合养分管理 (INM) 实践的长期田间试验于2006年在kharif开始，在水稻单作制度下的教学兼研究 (ICR) 农场进行。治疗由 T _{1 组成}；绝对控制，T ₂；100% 推荐剂量的氮 (N)、磷 (P) 和钾 (K)、T ₃；50% 推荐剂量的 NP + 100% K + 生物肥料，T ₄；50% 推荐剂量的 NP + 100% K + ECM，1 吨 ha ^-1和 T ₅; 2 吨公顷^{-1 的}25% 推荐剂量的 NP + 100% K + ECM 。可交换铝（~31%）和强有机结合和层间铝（~26%）分数随着在所有土壤深度的 ECM 应用剂量的增加而减少。然而，弱有机结合的铝（~25%）、无定形铝（~7.3%）和游离铝（~13%）在 100% NPK 时显着增加。长期使用 ECM 对收获后土壤中的微量营养素含量有显着的积极影响。水稻中微量元素（锌、铁、铜、锰和镍）的积累随着施肥和施肥的持续增加而增加，而铝的积累则显着减少。