Smallholders in sub-Saharan Africa traditionally cultivate orange-fleshed sweetpotato without soil fertility management, leading to soil nutrient mining and thereby threatening future food security. We set out to determine the potential of locally-accessible organic amendments and weed biomass management to secure crop nutritional quality and yield while maintaining soil fertility. Orange-fleshed sweet potato was fertilized with sole or co-application of poultry manure, cowpea residue, and inorganic fertilizer, combined with removal or incorporation of biomass residue from the fallow period. Non-amended control represented current farmers practice. Poultry manure fertilization, in sole or co-application with inorganic fertilizer, maintained storage root yield from the first to the second season, averaging 7.7 t ha⁻¹. Conversely, non-amended control decreased storage root yield by 61% from the first to the second season. Poultry manure with weed biomass incorporation maintained total soil C and N at 14.4 g kg⁻¹ and 1.1 g kg⁻¹, respectively, after two growing seasons. Poultry manure co-applied with inorganic fertilizer decreased total C and N by 15% and 14% respectively. The changes in soil total C and N observed in this experiment provide basis to support management recommendations for farmers focusing on locally-sourced organic amendments. Poultry manure is the more reliable organic amendment to maintain sweet potato agricultural performance and soil fertility, with potential to support long-term sweet potato cultivation. The negative effect of inorganic fertilizer on total soil nutrient concentration after two seasons needs consideration to avoid soil fertility mismanagement.

撒哈拉以南非洲地区的小农户传统上在没有土壤肥力的情况下种植橙皮甘薯，导致土壤养分的开采，从而威胁到未来的粮食安全。我们着手确定在当地可获得的有机改良剂和杂草生物量管理的潜力，以确保作物营养质量和产量，同时保持土壤肥力。将橙皮红薯与家禽粪便，cow豆残渣和无机肥料一起施用或单独施用，并从休耕期中去除或掺入生物质残渣。未经修订的控制代表了当前的农民实践。单独或与无机肥料共同施用的家禽粪便肥料，从第一季到第二季均保持了贮藏根的产量，平均为7.7 t ha ^-1。相反，未经修正的对照从第一季到第二季使贮藏根的产量降低了61％。掺入杂草生物量的家禽粪便将土壤总C和N保持在14.4 g kg ^-1和1.1 g kg ^-1经过两个生长季节。与无机肥料一起施用的家禽粪便总碳和氮分别降低了15％和14％。在该实验中观察到的土壤总碳和氮的变化为支持针对以当地来源的有机改良剂为主的农民的管理建议提供了依据。家禽粪便是更可靠的有机改良剂，可保持甘薯的农业生产性能和土壤肥力，并有可能支持长期的甘薯种植。在两个季节后，应考虑无机肥料对土壤总养分浓度的负面影响，以避免土壤肥力管理不善。