ABSTRACT Macaw palm (Acrocomia aculeata) is a widespread tree in Brazil, and the oil industry has been increasing interest in this tree due to its high oil concentrations, rusticity, and adaptability to different environments. Currently, macaw palms are being domesticated and are in an early rational cultivation process. Foliar diagnosis can contribute to managing fertilization, but there is no protocol for leaf sampling. This study aimed to evaluate the seasonal variation of leaf nutrient contents and indicate an adequate period […]

ABSTRACT Tissue analysis results are interpreted by comparing them with nutrient standards; however, using universal standards may lead to a misleading nutritional diagnosis. This study aimed to evaluate the degree of universality of Kenworthy and DRIS norms for irrigated ‘Prata-Anã’ (AAB) and ‘Grande Naine’ (AAA) banana plants grown in two environments. The study was carried out using a database containing leaf nutrient contents and yield data of two farms located in Ponto Novo, Bahia State, and Missão Velha, Ceará State, […]

Sugarcane is considered a Si-accumulating plant, but in Brazil, where several soil types are used for cultivation, there is little information about silicon (Si) fertilization. The objectives of this study were to evaluate the silicon availability, uptake and recovery index of Si from the applied silicate on tropical soils with and without silicate fertilization, in three crops. The experiments in pots (100 L) were performed with specific Si rates (0, 185, 370 and 555 kg ha-1 Si), three soils (Quartzipsamment-Q, […]

A number of studies have pointed out how potassium can alleviate the effects of sodium toxicity on plants. However, the mechanisms of interaction between these two ions at the whole plant level are poorly understood so far. This study assessed some physiological mechanisms involved with the K-Na interaction in Jatropha curcas seedlings exposed to salinity. The experiment was carried out in a completely randomized, 2 × 2 factorial design (two Na and K levels in nutrient solution, with five replications). […]

Several studies have confirmed the benefits of silicon (Si) for crop growth. The purpose of this study was to evaluate the effects of Si on the initial growth of coffee plants cv. Catuaí Vermelho. This study was carried out with potted plants grown in a greenhouse, without water deficiency. Dry matter partitioning of roots, stems and leaves as well as the chemical composition of plant tissues and soil and leaf gas exchange were evaluated in plants treated with 0 (control), […]

In the best cultivation methods of orchids, in particular of the genus Phalaenopsis, liming is a common practice. The objective of this study was to evaluate the influence of lime rates (0.0; 1.0; 2.0; 3.0; 4.0; and 5.0 g dm-3 of substrate) applied to the cultivation substrate (xaxim) on the growth of Epidendrum ibaguense seedlings. In a greenhouse, 1-L plastic pots filled with 0.8 dm3 of xaxim were irrigated such that no leachate was lost during the experiment. N, P, K, Ca, Mg, […]

The use of diagnosis methods for the determination of normal nutrient ranges is efficient since it is region-specific, thus not always applicable to other regions. This study aimed to determine the optimum nutrient ranges for cotton based on the Best likelihood (ChM), Diagnosis and Recommendation Integrated System (DRIS) and Compositional Nutrient Diagnosis (CND). The study was conducted in commercial cotton fields for the 2004/2005 growing season, in São Desidério, state of Bahia, Brazil. The total nutrient content of 65 whole […]

Silicon is classified as a beneficial nutrient and can improve the nutritional dynamics of plants, although it is not considered an essential nutrient for plants. In an experiment in a randomized block design, three coffee cultivars (Catuaí, Mundo Novo and Icatu) were planted in plastic tubes, combined with six doses of calcium silicate (T0=0, T1=0.063, T2=0.125, T3=0.25, T4=0.5 and T5=1.0 g dm-3 substrate), to compare the nutritional efficiency of the cultivars in response to silicon fertilization. Cultivar Icatu showed the […]

The concentrated suspension (CS), the basis of Mo trioxide, allows high Mo concentrations and is therefore a technical advance for seed treatment, since it allows the recommendation of the Mo at lower dosage than with the liquid solution formulations (LS). The purpose of this research was to evaluate the efficiency and doses of fertilizer with Mo and Co in concentrated suspension in comparison with liquid solution as well as fertilizers associated with phytohormones, applied in seed treatments, and their effect […]

The adventitious rooting of cuttings is influenced by intrinsic and extrinsic factors of the plant material. The knowledge about the action mode of these factors upon rooting is fundamental for the successful production of clonal seedlings through minicuttings. The objective of this study was to evaluate the degree of association between the nutritional state of ministumps with the rooting of eucalypt minicuttings, grown in a clonal minigarden in tubes with subirrigation. Data from minicutting rooting and nutrient contents quantified by […]