R E S U M OA melancia apresenta pouca tolerância à deficiência de boro e seu fornecimento via tratamento de sementes pode atender a necessidade da planta e melhorar seu desenvolvimento especialmente na fase de mudas. Objetivou-se com esse trabalho avaliar o desenvolvimento inicial de mudas de melancia em função da aplicação de boro nas sementes. O experimento foi realizado em abrigo telado (50% de luminosidade), em Bom Jesus-PI no período de abril a maio de 2011. Adotou-se o delineamento em blocos casualizados, com os tratamentos: 0,0; 4,24; 8,50; 17,00; 34,00 g de B kg -1 de sementes, com cinco repetições e cinco plântulas por parcela experimental. Foram utilizados como recipientes tubetes com capacidade para 50 cm 3 , preenchidos com substrato constituído de solo (Latossolo Vermelho), areia lavada e esterco bovino na proporção (1:1:2), respectivamente. No final do experimento, avaliou-se: i) a altura da planta; ii) diâmetro do caule; iii) matéria seca de raiz e da parte aérea (g planta -1 ); iv) clorofila; v) comprimento da raiz e vi) volume radicular. A aplicação de boro nas sementes influenciou positivamente as variáveis altura da planta, clorofila, matéria seca da parte aérea, comprimento radicular e volume radicular. A dose de 25,5 g de B kg -1 de sementes é recomendada para maior produção de matéria seca das mudas. Palavras-chave: ácido bórico, adubação via semente, olerícola. A B S T R A C TWatermelon has little tolerance to boron deficiency and supply via seed treatment can meet the need of the plant and improve its development especially in the seedling stage. The objective of this study was to evaluate the initial development of watermelon seedlings due to boron application in seeds. The experiment was conducted under greenhouse conditions (50% brightness) in Bom Jesus-PI from April to May 2011. A randomized complete block design was adopted with treatments: 0.0; 4.24; 8.50; 17.00; 34.00 g of B kg -1 of seeds, with five replications and five seedlings per experimental plot. There were used containers with a capacity of 50 cm 3 , filled with a substrate composed of soil (Oxisol), washed sand and manure in the ratio (1:1:2), respectively. At the end of the experiment, it was evaluated: i) the height of the plant; ii) stem diameter; iii) dry matter of root and shoot (g plant -1 ); iv) chlorophyll; v) root length and vi) root volume. The application of boron in the seeds positively influenced the variables plant height, chlorophyll, dry matter of shoot, root length and root volume. The dose of 25.5 g of B kg -1 of seeds is recommended for higher dry matter production of seedlings.
The mango cultivation has shown considerable losses, due to the intense occurrence of physiological disorders in its fruits, and stenospermocarpy is the main disorder under tropical semiarid conditions. So, the experiment was carried out to evaluate the potential loss of yield of mango cv. Palmer by stenospermocarpy, its relation with the nutritional state of the plant and yield as a function of fertilization strategies. The study was conducted in two experimental areas in the Brazilian semiarid. There is evidence that the leaf contents of phosphorus (P), iron (Fe) and zinc (Zn) influenced the development of stenospermocarpy fruits, associated with high temperature and low relative humidity in the flowering period of the crop. The incidence of fruits affected by stenospermocarpy reaches 90%, with an estimated yield loss of 28.81 Mg ha-1 for the mango cv. Palmer.
Knowing the accumulation of nutrients in mango plants is essential for calibrating fertilization programs aiming to increase yield in nutritionally unbalanced orchards. The work aimed to evaluate mango nutritional efficiency through nutrient accumulation and partitioning in plants of Palmer cultivar grown in sand soils at São Francisco Valley, Northwest Brazil. Commercial orchards located in Bahia and Pernambuco States, Brazil, under semi-arid climate (BShw; 400-800 mm annual rainfall) had the vegetable biomass and nutrient contents in the mango compartments determined in 1, 2, 4, 7, and 12 years old plants, by evaluating four plants of each age from 20 sample units. The separated samples of the harvested trees originated the compartments roots, stems, thick twigs, thin twigs, leaves and fruits. Nutrient contents and plant dry matter per compartment were determined and plant nutrient accumulation evaluated. Biomass and fruits coefficient of biological utilization were calculated. There was increment in the accumulated content of macronutrients in the mango plants over the years, with superiority for N and K, for which there was a sharp increase as compared to the other macronutrients. Manganese and Fe were the most accumulated micronutrients in the plants over the years. The canopy of the mango Palmer plants is the compartment that accumulates more macro and micronutrients, and the partition within the canopy occurs in the sequence: leaf> thin twig> thick twig. Phosphorus and Mg, and Cu and B are the nutrients more efficient to generate plant biomass and fruit production in the mango Palmer orchards.
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