Tree/shrub species are used in farmer fields of sahelian agroforestry parklands to conserve and restore degraded lands, improve soil fertility and increase crop yield. A field study was conducted to investigate the effect of five tree species (Annona senegalensis, Balanites aegyptiaca, Faidherbia albida, Guiera senegalensis and Piliostigma reticulatum) on soil fertility and crop yield under different fertility management practices in semi-arid Niger. Three factors (tree species, positions to tree trunk and fertilizer management) and four levels of fertilizer microdosing management (DAP, NPK, manure and control) were investigated. We found that tree species improved soil fertility and crop yield differently. F. albida, improved the soil quality far better than other four tree species for all soil nutrients analyzed. The highest millet yield was recorded under P. reticulatum and F. albida for both grain (1011 and 1005 kg ha⁻¹, respectively) and straw yields (3662 and 3786 kg ha⁻¹, respectively). The yield was found to be two- to four-folds higher under direct tree crown compared to close neighborhood or treeless outside. The combined tree species and fertilizer effect were additive and the positive effect can extend to the outside crown. However, the combined effect of mineral fertilizer with tree species on yield was better than that of manure. Integrated tree species and moderate fertilizers was effective and can be used as a sustainable fertility management practice in Sahelian countries where organic amendment is frequently scarce and it is difficult for smallholder farmers to adopt high recommended mineral fertilizer for crop production. Further investigations are needed to assess the economic performance and the long-term sustainability of the integrated trees and soil fertility management in the Sahel.

树木/灌木物种用于萨赫勒农林复合林地的农田中，以保护和恢复退化的土地，提高土壤肥力并增加农作物的产量。实地研究旨在探讨五个树种（效果番荔枝塞内加尔，Balanites aegyptiaca，白相思树，塞内加尔吉耶拉树和Piliostigma网藻对土壤肥力和作物产量）下半干旱尼日尔不同肥力管理实践。研究了三个因素（树种，树干位置和肥料管理）和四个水平的肥料微剂量管理（DAP，NPK，肥料和控制）。我们发现树木物种以不同的方式提高了土壤肥力和作物产量。在分析的所有土壤养分方面，F。albida改善了土壤质量，远优于其他四种树种。谷物（分别为1011和1005 kg ha ^-1）和稻草的产量（分别为3662和3786 kg ha ^-1）都记录在网纹假单胞菌和白粉虱下的最高谷子产量。， 分别）。发现直接树冠下的收成比紧密邻里或无树外的收成高2-4倍。结合的树种和肥料效应是累加的，其正面效应可以扩展到外冠。然而，矿物肥料与树木的结合对产量的影响要大于肥料。综合树种和适度的肥料是有效的，并且可以在萨赫勒的国家用作可持续的肥力管理措施，因为萨赫勒的国家经常缺乏有机改良剂，小农很难采用推荐的高矿物肥料来生产农作物。需要进一步调查以评估萨赫勒地区综合树木和土壤肥力管理的经济表现和长期可持续性。