Growth, yield and nutrients of sweet cassava fertilized with zinc

ABSTRACT: The application of zinc fertilizers in the soil has been an agronomic practice to correct Zn deficiency in plants, aiming to increase productivity and/or nutritional quality. This study evaluated how zinc sulfate fertilization affects plant growth, yield performance and nutrient accumulation in the cassava ‘IAC 576-70’. The experimental design was in randomized blocks with eight replications. The treatments consisted of 0, 1.5, 3.0, 4.5 and 6.0 g p1-1 ZnSO4. Results showed improvement in yield with soil fertilization with ZnSO4, with the optimal dose of 2.5 g pl-1. The uptake of nutrients in plant parts is favored with lower doses of zinc fertilizer, with maximum points ranging from 0.8 to 3.2 g pl-1 for macronutrients and 1.6 to 3.6 g pl-1 for micronutrients. The Zn content in tuberous roots increases by more than 40% with fertilization up to 2.8 g pl-1 of fertilizer, which contributes to the nutritional value of roots.摘要：向土壤施用锌肥是矫正植物锌缺乏的常规农艺措施，旨在提升作物产量与营养品质。本研究以木薯品种‘IAC 576-70’为试材，评估了硫酸锌（ZnSO₄）施肥对其植株生长、产量表现及养分积累的影响。试验采用随机区组设计，设置8次生物学重复。供试处理分别为0、1.5、3.0、4.5及6.0 g·株⁻¹的ZnSO₄。结果表明，土壤施用ZnSO₄可显著提升产量，最佳施用剂量为2.5 g·株⁻¹。低剂量锌肥可促进植株各器官的养分吸收，大量元素养分吸收的峰值区间为0.8~3.2 g·株⁻¹，微量元素养分吸收的峰值区间为1.6~3.6 g·株⁻¹。当施肥剂量不超过2.8 g·株⁻¹时，块根中的锌含量可提升40%以上，这有助于提升块根的整体营养价值。