Abstract
The management of micronutrients in oil palm trees in the Brazilian Amazon is still underdeveloped; thus, information on plant demands and their interactions with other nutrients is required to create adequate management procedures. The objective this work was to evaluate the effects of phosphate, potassium, and magnesium fertilization on micronutrient concentrations in leaves of oil palm trees. The experiment was carried out in the Brazilian Amazon in a randomized block design in a 4 x 2 x 3 x 2 factorial scheme, using four phosphorus levels, two phosphorus sources (natural phosphate and triple superphosphate), three potassium levels and two magnesium levels. Phosphate fertilization increased the concentrations of boron, chlorine, and iron in leaves, while copper and manganese concentrations in leaves decreased with increased doses of phosphorus. Among the phosphorus sources, triple superphosphate provided higher chlorine concentrations in leaves. Potassium fertilization increased only chlorine concentrations in leaves, while magnesium supply did not alter micronutrient concentrations in leaves. Thus, phosphorus and potassium fertilizers are essential to provide adequate micronutrient concentrations in leaves of oil palm trees.
Highlights
Oil palm (Elaeis guineensis Jacq.) is originally from the African continent and is widely2021, Vol 9, No 1 cultivated in tropical regions
The objective this work was to evaluate the effects of phosphate, potassium, and magnesium fertilization on micronutrient concentrations in leaves of oil palm trees
Some studies have evaluated micronutrient concentrations in oil palm trees in Pará State (Matos et al, 2017; Matos et al, 2019; Viégas et al, 2020), they have not investigated the effect of fertilization on micronutrient concentrations
Summary
Oil palm (Elaeis guineensis Jacq.) is originally from the African continent and is widely2021, Vol 9, No 1 cultivated in tropical regions. The presence of nutrients is crucial to ensure good soil quality and management, especially in agricultural ecosystems (Lopes & Guilherme, 2007). Natural causes, such as soil genesis and weathering, are the main causes of low soil fertility, especially in tropical and subtropical regions, due to high temperatures and rainfall levels, which accelerate the leaching of nutrients (Lopes & Guilherme, 2007). The nutrients available in tropical soils are insufficient to meet the nutritional demands of cultivated plants, requiring soil fertilization (Priyandari et al, 2017). Micronutrients are essential elements for plants and are demanded in small amounts. Some studies have evaluated micronutrient concentrations in oil palm trees in Pará State (Matos et al, 2017; Matos et al, 2019; Viégas et al, 2020), they have not investigated the effect of fertilization on micronutrient concentrations
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