ABSTRACT

Essential nutrient concentrations in edible portions of crops can affect human health. Hence, field experiments were carried out for two growing seasons (2019 and 2020) at two degraded sites using a randomized complete block design in a factorial layout with three replications to evaluate the effects of biochar (B), poultry manure (PM), and their combined application on leaf nutrient concentrations and mineral composition of sweet potato. Each year, the experiment consisted of 4 × 3 factorial combinations of biochar (0, 10.0, 20.0, and 30.0 t ha⁻¹) and poultry manure (0, 5.0 and 10.0 t ha⁻¹). The results showed that the sole application of B and PM and their combined application, improved sweet potato leaf nutrient concentrations and mineral composition of sweet potato storage roots. In both years, there were significant interactions of B and PM (B × PM) on leaf nutrient concentrations and mineral composition of sweet potato that were determined, indicating the potential of B in enhancing PM use efficiency and improving better use of the nutrients in the PM. It was found that the highest dosage of combination of 30.0 t ha⁻¹ B and 10.0 t ha⁻¹ PM (B₃₀+ PM₁₀) gave the highest leaf nutrient concentrations and mineral composition of sweet potato at both sites. Lowest leaf nutrient concentrations and mineral composition was obtained for the control. The study indicated that B in combination with PM have the potential to improve sweet potato leaf nutrient concentrations and mineral composition of sweet potato storage roots for human health in severely degraded soils.

摘要

作物可食用部分的必需营养素浓度会影响人类健康。因此，在两个退化地点进行了两个生长季节（2019 年和 2020 年）的田间试验，使用具有三个重复的因子布局中的随机完整区组设计来评估生物炭 (B)、家禽粪便 (PM) 和它们在甘薯叶片养分浓度和矿物质组成中的联合应用。每年，该实验由生物炭（0、10.0、20.0 和 30.0 t ha ^-1）和家禽粪便（0、5.0 和 10.0 t ha ^{-1 ）的 4 × 3 因子组合组成}）。结果表明，单独施用B和PM并联合施用，提高了甘薯叶片养分浓度和甘薯贮藏根的矿物质组成。在这两年中，B 和 PM (B × PM) 对甘薯叶片养分浓度和矿物质组成存在显着的交互作用，表明 B 在提高 PM 利用效率和改善甘薯中养分利用方面的潜力。下午。发现 30.0 t ha ^-1 B 和 10.0 t ha ^-1 PM (B ₃₀ + PM ₁₀) 给出了两个地点甘薯的最高叶片营养浓度和矿物质组成。对照获得了最低的叶养分浓度和矿物质组成。研究表明，在严重退化的土壤中，B 与 PM 结合有可能改善甘薯叶的养分浓度和甘薯贮藏根的矿物质组成，以促进人类健康。