ABSTRACT Balanced application of phosphorus (P) fertilizer is important for productive agricultural systems with a reduced environmental footprint. This study aimed to assess the effect of P on the leaf yield, P use efficiency, P concentration and uptake by Aloe vera. A pot trial experiment was conducted using a completely randomized design, with six levels of P applied at 0, 30, 45, 60, 80, and 120 kg ha−1, replicated in triplicate. The results revealed that yield attributes, leaf yield, P concentration and uptake were significantly improved with P application and optimum results were obtained when P was applied at 80 kg ha−1. The addition of P increased leaf yield by 33 to 91% compared to the untreated control. Likewise, the highest numbers of suckers, leaves, fresh and dry gel weight, and profit based on benefit cost ratio was recorded with this treatment. In contrast, the highest P concentration and uptake by the leaf were observed at the highest P treatment rate of 120 kg ha−1. The highest plant height, leaf area and fresh gel weight were responsible for the production of higher leaf yield. The minimum amount of P for 80% leaf biomass production was estimated to be 43.9 kg ha−1 whereas the critical leaf P concentration was 0.62% for Aloe vera cultivation. The result suggests that application of 80 kg P ha−1 could produce economically higher yield of A. vera, and further investigation is now required to validate these results for other soil types under field conditions.

中文翻译：

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粉质壤土栽培芦荟磷素利用效率及要求

摘要 磷 (P) 肥料的平衡施用对于减少环境足迹的生产性农业系统很重要。本研究旨在评估磷对芦荟叶片产量、磷利用效率、磷浓度和吸收的影响。使用完全随机设计进行盆栽试验，以 0、30、45、60、80 和 120 kg ha - 1 施用六个水平的磷，重复三次。结果表明，施磷显着提高了产量属性、叶片产量、磷浓度和吸收量，当施磷 80 kg ha - 1 时获得最佳结果。与未处理的对照相比，磷的添加使叶产量增加了 33% 至 91%。同样，最高数量的吸盘、叶子、新鲜和干凝胶重量，这种处理方式记录了基于收益成本比的利润。相比之下，在 120 kg ha - 1 的最高磷处理率下观察到最高的磷浓度和叶片吸收。最高的株高、叶面积和新鲜凝胶重量是产生较高叶产量的原因。80% 叶生物量生产所需的最小磷量估计为 43.9 kg ha - 1，而芦荟栽培的临界叶磷浓度为 0.62%。结果表明，施用 80 kg P ha - 1 可以在经济上产生更高的 A. vera 产量，现在需要进一步调查以验证田间条件下其他土壤类型的这些结果。最高的株高、叶面积和新鲜凝胶重量是产生较高叶产量的原因。80% 叶生物量生产所需的最小磷量估计为 43.9 kg ha - 1，而芦荟栽培的临界叶磷浓度为 0.62%。结果表明，施用 80 kg P ha - 1 可以在经济上产生更高的 A. vera 产量，现在需要进一步调查以验证田间条件下其他土壤类型的这些结果。最高的株高、叶面积和新鲜凝胶重量是产生较高叶产量的原因。80% 叶生物量生产所需的最小磷量估计为 43.9 kg ha - 1，而芦荟栽培的临界叶磷浓度为 0.62%。结果表明，施用 80 kg P ha - 1 可以在经济上产生更高的 A. vera 产量，现在需要进一步调查以验证田间条件下其他土壤类型的这些结果。