Abstract A field experiment was conducted during Kharif and Summer seasons for two consecutive years of 2016-17 and 2017-18 with rice (Oryza sativa L.) and cowpea (Vigna unguiculata L.), grown in a sequence at Zonal Agricultural Research Station, Mandya on an acid soil to study the effect of biochar, lime and mangala setright on yield, nutrient uptake and fertility status of an acidic soil. Application of biochar along with soil test value based fertilizer (STV) + FYM + ZnSO4 influenced the productivity of rice and cowpea of 104.82 q ha−1 and 2474.77 kg ha−1, respectively and the uptake of nitrogen, phosphorus and potassium by rice (107.72, 28.16 and 69.34 kg ha−1, respectively) and cowpea (68.06, 5.86 and 38.67 kg ha−1, respectively) significantly, which was found on par with application of biochar along with RDF + FYM + ZnSO4. The soil pH (6.01), organic carbon content (5.03 g kg−1) and available nitrogen (340.45 kg ha−1), phosphorus (39.45 kg ha−1) and potassium (166.45 kg ha−1) significantly increased through the integrated use of biochar, FYM, ZnSO4 and fertilizers. Yield and soil properties like soil pH, organic carbon content and available nitrogen, phosphorus and potassium significantly increased with application of lime and mangala setright as compared to farmer’s practice. Highest net income and benefit:cost ratio (2.65) was obtained with integration of soil test value based fertilizer application, FYM and biochar. Significant reduction in the productivity of crop and soil fertility was recorded in farmer’s practice.

中文翻译：

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卡纳塔克邦酸性土壤中生物炭、石灰和测土值施肥对水稻-豇豆种植系统土壤肥力、养分吸收和产量的影响

摘要 在 2016-17 和 2017-18 连续两年的 Kharif 和夏季季节对水稻 (Oryza sativa L.) 和豇豆 (Vigna unguiculata L.) 进行了田间试验，在区域农业研究站依次种植， Mandya 在酸性土壤上研究生物炭、石灰和 mangala 对酸性土壤的产量、养分吸收和肥力状况的影响。生物炭和测土肥（STV）+ FYM + ZnSO4 的施用分别影响水稻和豇豆的生产力 104.82 q ha-1 和 2474.77 kg ha-1，以及水稻对氮、磷和钾的吸收（ 107.72、28.16 和 69.34 kg ha-1）和豇豆（分别为 68.06、5.86 和 38.67 kg ha-1）显着，这与生物炭与 RDF + FYM + ZnSO4 的应用相当。土壤pH值（6.01），通过综合利用生物炭、FYM、ZnSO4，有机碳含量（5.03 g kg-1）和有效氮（340.45 kg ha-1）、磷（39.45 kg ha-1）和钾（166.45 kg ha-1）显着增加和肥料。与农民的实践相比，随着石灰和曼加拉的正确施用，产量和土壤特性（如土壤 pH 值、有机碳含量和有效氮、磷和钾）显着增加。通过结合基于土壤测试值的施肥、FYM 和生物炭获得最高的净收入和收益：成本比 (2.65)。农民的实践记录了作物生产力和土壤肥力的显着下降。45 kg ha-1) 通过综合使用生物炭、FYM、ZnSO4 和肥料显着增加。与农民的实践相比，随着石灰和曼加拉的正确施用，产量和土壤特性（如土壤 pH 值、有机碳含量和有效氮、磷和钾）显着增加。结合基于土壤测试值的施肥、FYM 和 biochar，获得了最高的净收入和收益：成本比 (2.65)。农民的实践记录了作物生产力和土壤肥力的显着下降。45 kg ha-1) 通过综合使用生物炭、FYM、ZnSO4 和肥料显着增加。与农民的实践相比，随着石灰和曼加拉的正确施用，产量和土壤特性（如土壤 pH 值、有机碳含量和有效氮、磷和钾）显着增加。结合基于土壤测试值的施肥、FYM 和 biochar，获得了最高的净收入和收益：成本比 (2.65)。农民的实践记录了作物生产力和土壤肥力的显着下降。结合基于土壤测试值的施肥、FYM 和 biochar，获得了最高的净收入和收益：成本比 (2.65)。农民的实践记录了作物生产力和土壤肥力的显着下降。通过结合基于土壤测试值的施肥、FYM 和生物炭获得最高的净收入和收益：成本比 (2.65)。农民的实践记录了作物生产力和土壤肥力的显着下降。