This study evaluated the effect of Inga edulis trees on soil quality attributes and forage yield and moisture in a pasture field in the county of Carrancas, Minas Gerais, Brazil. Soil samples were collected under the canopy and beyond the canopy projection of five I. edulis trees, at four distances from the tree trunks to beyond the canopy projection, along the radius line. A randomized block design was used, in which five trees represented five blocks and the four distances from the trees corresponded to the treatments. The forage yield and moisture, soil moisture and chemical attributes, density and diversity of arbuscular mycorrhizal fungi (AMF) spores and the presence of nodule-forming nitrogen-fixing bacteria in legumes were evaluated. The statistical analysis was performed using ANOVA and the Scott-Knott test (p = 0.05). No statistical differences between forage yield and moisture were found in the soil under or beyond the canopy projection. The soil quality was elevated, indicated by the improved soil pH, base saturation, sum of bases and effective cation exchange capacity in the samples collected closer to I. edulis. No changes in the density and diversity of AMF spores or in the nodulation and development of inoculated seedlings were observed in soil collected at different distances from the trees. Consequently, I. edulis trees can be intercropped with pasture to increase the soil quality without affecting forage yields.

中文翻译：

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Inga edulis 市场。与牧场间作在不影响草料产量的情况下改善土壤质量

本研究评估了 Inga edulis 树对巴西米纳斯吉拉斯州卡兰卡斯县牧场的土壤质量属性和牧草产量和水分的影响。沿半径线，在从树干到树冠投影之外的 4 距离处，在 5 棵杜鹃花树的冠层下和冠层投影之外收集土壤样品。使用随机区组设计，其中五棵树代表五个区组，距离树木的四个距离对应于处理。评估了牧草产量和水分、土壤水分和化学属性、丛枝菌根真菌 (AMF) 孢子的密度和多样性以及豆科植物中结瘤固氮细菌的存在。使用方差分析和 Scott-Knott 检验 (p = 0.05) 进行统计分析。在冠层投影之下或之外的土壤中未发现牧草产量和水分之间的统计差异。土壤质量得到提高，这表现为在靠近 I. edulis 收集的样品中改善的土壤 pH 值、碱饱和度、碱总和和有效的阳离子交换能力。在距树木不同距离收集的土壤中，未观察到 AMF 孢子的密度和多样性或接种幼苗的结瘤和发育发生变化。因此，可以在牧草中间作 I. edulis 树以提高土壤质量而不影响草料产量。靠近 I. edulis 收集的样品中的碱基总和和有效阳离子交换容量。在距树木不同距离收集的土壤中，未观察到 AMF 孢子的密度和多样性或接种幼苗的结瘤和发育发生变化。因此，可以在牧草中间作 I. edulis 树以提高土壤质量而不影响草料产量。靠近 I. edulis 收集的样品中的碱基总和和有效阳离子交换容量。在距树木不同距离收集的土壤中，未观察到 AMF 孢子的密度和多样性或接种幼苗的结瘤和发育发生变化。因此，可以在牧草中间作 I. edulis 树以提高土壤质量而不影响草料产量。