Nitrogênio e densidade de plantio na avaliação econômica e qualidade de frutos de abacaxizeiro

Silva, Deivisson Ferreira da; Pegoraro, Rodinei Facco; Medeiros, Ananias Costa; Lopes, P. A. P.; Cardoso, Maurício Mendes; Maia, Victor Martins

doi:10.1590/1983-40632015v4527998

Cited by 8 publications

(7 citation statements)

References 8 publications

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“…The average mass of fruits, pulp as well as total and pulp productivity (Fig. 4A, 4B, 4C and 4D) had a linear increase nitrogen rates, which agrees with Caetano et al (2013) and Silva et al (2015) who reported that the increment of nitrogen rates increase the size of the fruits, promoting greater yield.…”

Section: Resultssupporting

confidence: 87%

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Production and quality of 'Pérola' pineapple under fertigation

et al. 2020

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The aim of this paper is to evaluate the yield and quality of 'Pérola' pineapple under increasing rates of nitrogen and potassium applied through fertigation. The experiment was conducted in a randomized block design, with four replications, in a factorial scheme (4x4), which represents four nitrogen rates (128, 256, 384 and 512 kg ha-1 of N) and four potassium rates (192, 384, 576 and 768 kg ha-1of K2O) via fertigation. The evaluations consisted of physical and chemical fruit characteristics and yield. Increasing nitrogen rates provided linear growth on fruit production features and the rate of 516 kg ha-1 resulted in fruits with the largest diameters. The highest total yield on 'Pérola' pineapple crop was reached on plants under the supply of 498 kg ha-1 of K2O. Rates between 523 and 583 kg ha-1 of K2O, provided the largest fruit matter and the highest fruit pulp yield. The increasing amount of nitrogen applied by fertigation resulted in linear growth on fruit pulp pH, though it did not influence the soluble solids content. The lower acid content and higher SS/acid ratio on fruits were reached with the N rates of 333 and 375 kg ha-1 respectively. The aim of this paper is to evaluate the yield and quality of 'Pérola' pineapple under increasing rates of nitrogen and potassium applied through fertigation. The experiment was conducted in a randomized block design, with four replications, in a factorial scheme (4x4), which represents four nitrogen rates (128, 256, 384 and 512 kg ha-1 of N) and four potassium rates (192, 384, 576 and 768 kg ha-1of K2O) via fertigation. The evaluations consisted of physical and chemical fruit characteristics and yield. Increasing nitrogen rates provided linear growth on fruit production features and the rate of 516 kg ha-1 resulted in fruits with the largest diameters. The highest total yield on 'Pérola' pineapple crop was reached on plants under the supply of 498 kg ha-1 of K2O. Rates between 523 and 583 kg ha-1 of K2O, provided the largest fruit matter and the highest fruit pulp yield. The increasing amount of nitrogen applied by fertigation resulted in linear growth on fruit pulp pH, though it did not influence the soluble solids content. The lower acid content and higher SS/acid ratio on fruits were reached with the N rates of 333 and 375 kg ha-1 respectively.

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Section: Resultssupporting

confidence: 87%

“…5B). This result can be explained due to the production of larger fruits as applied increasing nitrogen rates, causing dilution of titratable acidity (TA) as reported by Silva et al (2015), and reaching a minimum point.…”

Section: Resultsmentioning

confidence: 79%

Production and quality of 'Pérola' pineapple under fertigation

et al. 2020

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“…FIGURA 2: Efeito das doses de cloreto de potássio sobre o número de frutos. FONTE: SILVA et al, 2015 Na análise da característica sólido solúvel total, ocorreu efeito quadrático da adubação potássica nos frutos do abacaxizeiro. O ponto de máxima na dose de y = 24175,66821** + 5,973637**x -0,002354**x 2 R² = 82% cloreto de potássio foi de 906,75 kg ha -1, foi obtido 14,15 ºBrix (Figura 3).…”

Section: Resultsunclassified

“…O ponto de máxima na dose de y = 24175,66821** + 5,973637**x -0,002354**x 2 R² = 82% cloreto de potássio foi de 906,75 kg ha -1, foi obtido 14,15 ºBrix (Figura 3). A adubação potássica exerce influência acentuada na composição química, principalmente no sólido solúvel total (SILVA et al, 2015).…”

Section: Resultsunclassified

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Fontes De Nitrogênio E Doses De Cloreto De Potássio Na Cultura Do Abacaxi Pérola

Silva¹,

Dalbosco²,

Krause³

et al. 2015

Agrarian Academy

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RESUMO A adubação tem influência diretamente sobre a produtividade e qualidade dos frutos do abacaxizeiro podendo ser um fator limitante para produção. Desta forma, o objetivo do trabalho foi identificar a melhor fonte de nitrogênio e a dose de cloreto de potássio recomendado para a cultura do abacaxi Pérola na região de Tangará da Serra. O experimento foi conduzido na área experimental da Universidade do Estado de Mato Grosso, sendo o solo classificado como Latossolo Vermelho Distroférrico, de textura argilosa e de relevo plano à levemente ondulado. O delineamento experimental foi em blocos casualizados, com a cultivar Pérola, num arranjo fatorial 5x2, sendo cinco doses de cloreto de potássio (0, 350, 700, 1050 e 1400 kg ha-1) e duas fontes de Nitrogênio (600 kg ha-1 de ureia e 1350 kg ha-1 de sulfato de amônio), com quatro repetições. Foram avaliadas cinco características físicas e o sólido solúvel total. O uso do sulfato de amônio como fonte de adubação nitrogenada proporcionou frutos maiores em relação ao uso da ureia. A adubação potássica na dose 876,98 kg ha-1 conferiu uma produtividade de 30.840 kg de frutos ha-1 e a dose de 1268,83 kg ha-1 propiciou 27.965 frutos ha-1 .

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Residues of Thiamethoxam and Chlorantraniliprole in Rice Grain

Teló

Senseman

Marchesan

et al. 2015

J. Agric. Food Chem.

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Thiamethoxam and chlorantraniliprole insecticides have been important tools for controlling pests in rice. However, food safety issues related to pesticide residues are important to consider with a food crop such as rice. Therefore, the objective of this study was to analyze thiamethoxam and chlorantraniliprole residues in rice hull, bran, and polished rice grains. The study was conducted during the 2012 cropping season at the Texas A&M Agrilife Research, David R. Wintermann Rice Research Station, near Eagle Lake, TX, USA. Rice was planted on May 5, 2012, using the cultivar 'Presidio'. Pesticide applications were performed at 5, 15, 25, and 35 days after flowering (DAF) using 1 and 2 times the recommended rate of 30 g active ingredient (ai) ha(-1) for thiamethoxam and 30 g ai ha(-1) for chlorantraniliprole. Sequentially, two treatments using the insecticides at recommended rate were applied at 5 and 25 DAF and at 5, 25, and 35 DAF. Insecticide residues were analyzed in different sample fractions: rice hull, bran, and polished rice grains. The samples were subjected to extraction using an accelerated solvent extraction (ASE) technique. Sample aliquots were analyzed using ultrahigh-performance liquid chromatography-tandem mass spectrometry (UHPLC-MS/MS), with a limit of quantification (LOQ) of 5 × 10(-5) mg kg(-1). Residues of thiamethoxam and chlorantraniliprole were detected in rice hull, bran, and polished rice grains, and the quantified values were greater in hull and in rice bran.

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Nitrogênio e densidade de plantio na avaliação econômica e qualidade de frutos de abacaxizeiro

Cited by 8 publications

References 8 publications

Production and quality of 'Pérola' pineapple under fertigation

Production and quality of 'Pérola' pineapple under fertigation

Fontes De Nitrogênio E Doses De Cloreto De Potássio Na Cultura Do Abacaxi Pérola

Residues of Thiamethoxam and Chlorantraniliprole in Rice Grain

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