Studies related to the absorption and exportation capacity of macronutrients by irrigated pineapple are essential for the definition of adequate doses and fertilization management. The objective of this study was to evaluate the accumulation of biomass and macronutrients in the compartments (leaves, shoot, root, seedlings/slip, crown/top, and fruit) of ‘Vitória’ pineapple irrigated in the semiarid region after the use of nitrogen doses and population densities. The treatments, arranged in randomized blocks with three replicates, arranged in a 5x4 factorial scheme, consisted of five nitrogen doses (0, 5, 10, 15 and 20 g per plant) and four population densities (51,282, 76,923, 90,909, and 126,984 plants ha-1). The accumulation of biomass and macronutrients in the pineapple compartments was evaluated at the end of the growing cycle. The increase of N doses combined with the increase of the plant population promoted a linear increase in the accumulation of biomass and macronutrients by the pineapple plants. The leaves presented greater accumulation of macronutrients, followed by the seedlings, shoot, fruit, crown, and roots. The pineapple presented the following decreasing order of macronutrient absorption: K> N> Ca> P> Mg>S. At the dose of 20 g per plant of N and population of 126,984 plants ha-1 were exported from the area by fruits, 1,311 (12%), 150 (9%), 144 (11%), 52 (11%), 46 (12%) and 36 (12%) kg ha-1 of K, N, Ca, P, Mg, and S, respectively; and by the shoots, 2,426 (22%), 480 (29%), 147 (11%), 101 (21%), 67 (18%), and 45 (15%) kg ha-1 of K, N, Ca, P, Mg, and S, respectively.
Resumo: É de máxima importância o conhecimento das necessidades nutricionais do pinhão manso (Jatropha curcas L.) cultivado em solos brasileiros, onde a adubação se faz necessária para o sucesso dos cultivos. Assim, objetivou-se com esta pesquisa avaliar a disponibilidade de fósforo (P) pelos extratores Mehlich 1, Olsen e Resina de Troca Aniônica, bem como a produção de biomassa do pinhão manso cultivado em Latossolo com diferentes texturas e doses de P2O5. O estudo seguiu o delineamento experimental em blocos casualizados, em esquema fatorial (2x6x3), com três repetições. Os tratamentos resultaram da combinação de dois solos (argiloso e arenoso), seis doses de P2O5 (50; 100; 150; 200; 250 e 300 kg ha -1 ) e três extratores (Melich 1, Olsen e Resina de Troca Aniônica). O pinhão manso foi cultivado em vasos por 90 dias, quando foram coletas amostras de solo para determinar o teor de P pelos extratores. A produção de biomassa e o conteúdo de P na planta foram maiores no solo arenoso e a produção de folhas e o conteúdo de P nas folhas, talo e raízes foram incrementados, de modo linear, até a dose 300 kg ha -1 de P2O5, indicando elevada demanda de P por essa cultura. O extrator Mehlich 1 quantificou maiores teores de P em comparação ao Olsen e à Resina de Troca Aniônica, possivelmente pela sua capacidade de extração de P-Ca nos solos,em razão da origem calcária. No entanto, o teor de P extraído pela Resina de Troca Aniônica e pelo Olsen apresentou maior relação com o conteúdo de P e produção de biomassa do pinhão manso, sendo mais indicados para avaliar o P disponível para a fase inicial de desenvolvimento dessa cultura.Palavras-chave: Mehlich 1. Oleaginosa. Olsen.Resina de troca aniônica. Abstract:Knowledge of the nutritional needs of Jatropha curcas L. is of the utmost importance when grown in Brazilian soils, where the use of fertiliser is necessary for the success of the crop. The aim of this research was to evaluate phosphorus (P) availability by the Mehlich 1, Olsen and Anionic Exchange Resin extractors, as well as biomass production in the Jatropha grown in a Latosol with different textures and doses of P. The experimental design was of randomised blocks in a 2 x 6 x 3 factorial scheme, with three replications. The treatments resulted from the combination of two soils (clayey and sandy), six doses of P2O5 (50, 100, 150, 200, 250 and 300 kg ha -1 ) and three extractors (Melich 1, Olsen and Anion Exchange Resin). The Jatropha was grown in pots for 90 days, when soil samples were collected to determine the P content by means of the extractors. The biomass production and P content of the plant were higher in the sandy soil. Leaf production and the P content of the leaves, stalk and roots increased linearly up to the dose of 300 kg ha -1 P2O5, indicating a high demand for P in this crop. The Mehlich 1 extractor quantified higher levels of P compared to the Olsen and Anion Exchange Resin, possibly due to its ability to extract P-Ca from the soils due to their limestone origin. However, the P content extracted...
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