Use of biochar (B) and poultry manure (PM) as soil amendments can improve the productivity and sustainability of tropical agriculture. Our fieldwork is the first research on the agronomic use of B and PM for the growth of cocoyam in sandy soil of the humid tropics. In this study, the effects of B, PM and their mixture were investigated on soil properties, mineral and nutrient concentrations, growth, and corm and cormel yields of cocoyam during the 2017 and 2018 cropping seasons. The experiment consisted of 4 × 2 factorial combinations of B (0, 10, 20, and 30 Mg ha−1) and PM (0 and 7.5 Mg ha−1). In both years, the application of B and PM either alone or in combination improved soil physical and chemical properties, plant nutritional status, growth, and corm and cormel yields of cocoyam. The combination of 30 Mg ha−1 B and 7.5 Mg ha−1 PM (B30 + PM7.5) gave the highest corm and cormel yields of cocoyam. Pooled over the 2 years, application of B at 30 Mg ha−1 and PM at 7.5 Mg ha−1 (B30 + PM7.5) significantly increased corm yield of cocoyam by 47 and 66%, respectively, when compared with sole PM at 7.5 Mg ha−1 and B at 30 Mg ha−1. Lowest corm and cormel yields were obtained for the unmanure control. The combination of 30 Mg ha−1 B and 7.5 Mg ha−1 PM is recommended for soil fertility management and cocoyam production in the rainforest agroecology of SW Nigeria.

中文翻译：

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生物炭和家禽粪便对退化热带沙土中可可（Xanthosoma sagittifolium Schott）的土壤性质、生长、品质和产量的影响

使用生物炭 (B) 和家禽粪便 (PM) 作为土壤改良剂可以提高热带农业的生产力和可持续性。我们的田野工作是第一次研究 B 和 PM 的农艺用途，用于在潮湿的热带沙质土壤中生长可可豆。在这项研究中，研究了 B、PM 及其混合物对 2017 年和 2018 年种植季节可可豆的土壤特性、矿物质和养分浓度、生长以及球茎和球茎产量的影响。该实验由 B 的 4 × 2 阶乘组合（0、10、20 和 30 Mg ha-1) 和 PM (0 和 7.5 Mg ha-1）。在这两年中，单独或联合施用 B 和 PM 可改善土壤理化性质、植物营养状况、生长以及可可豆的球茎和球茎产量。30 毫克/公顷的组合-1B 和 7.5 毫克公顷-1下午（乙30+ 下午7.5) 提供最高的球茎和球茎产量可可豆。2 年内汇总，B 施用量为 30 Mg ha-1和 PM 为 7.5 Mg ha-1（乙30+ 下午7.5) 与 7.5 Mg ha 的单一 PM 相比，可可豆的球茎产量分别显着提高了 47% 和 66%-1和 B 为 30 Mg ha-1. 对于未施肥控制，获得了最低的球茎和球茎产量。30 毫克/公顷的组合-1B 和 7.5 毫克公顷-1PM 被推荐用于尼日利亚西南部雨林农业生态学中的土壤肥力管理和可可豆生产。