ABSTRACT

Guava is one of the most important fruits in the Brazilian export market. The objective of this work was to evaluate the effects of liming and phosphorus (P) sources on micronutrients content in guava seedlings. The experimental design was completely randomized in a factorial scheme (2 × 3 × 3) comprising two dolomite limestone rates (0 and 5 Mg ha⁻¹), three soil types (Typical Red Oxisol, Typical Yellow Oxisol, and Typical Yellow Ultisol), and three P sources (Arad rock phosphate, thermophosphate ‘Yoorin,’ and triple superphosphate) at 150 mg kg⁻¹, with three replicates. Boron [B], copper [Cu], zinc [Zn], iron [Fe], and manganese [Mn] concentrations in guava seedling leaves and stems were affected by liming, by the P source, and by the soil type. Limestone and P sources altered the B, Cu, Zn, Fe, and Mn concentrations in leaves and stems of guava seedlings in each of the three evaluated soil types. Due to its low solubility, and regardless of soil type and liming, Arad rock phosphate was less effective than triple super phosphate as a P source for guava seedlings.

摘要

番石榴是巴西出口市场上最重要的水果之一。这项工作的目的是评估石灰和磷 (P) 源对番石榴幼苗微量营养素含量的影响。实验设计在因子方案 (2 × 3 × 3) 中完全随机化，包括两种白云石石灰石比率（0 和 5 Mg ha ^-1）、三种土壤类型（典型的红色氧化土、典型的黄色氧化土和典型的黄色 Ultisol），和三种磷源（Arad 磷酸岩、热磷酸盐“Yoorin”和三重过磷酸钙），浓度为 150 mg kg ^-1, 三个重复。番石榴幼苗叶和茎中的硼 [B]、铜 [Cu]、锌 [Zn]、铁 [Fe] 和锰 [Mn] 浓度受石灰、磷源和土壤类型的影响。石灰石和磷源改变了三种评估土壤类型中每一种的番石榴幼苗叶和茎中的 B、Cu、Zn、Fe 和 Mn 浓度。由于其溶解度低，并且无论土壤类型和石灰如何，Arad 磷酸岩作为番石榴幼苗的 P 源不如三重过磷酸钙有效。