Metodologia para determinação das necessidades nutricionais de melão e melancia

Paula, José Aluisio de Araújo; Medeiros, José Francismar de; Miranda, Neyton de Oliveira; Oliveira, Francisco de Assis de; Lima, Carlos J. G. de S.

doi:10.1590/s1415-43662011000900006

Cited by 15 publications

(11 citation statements)

References 14 publications

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“…Despite the greater variability of accumulation per plant in literature, these represent better nutritional demand in relation to their production, as verified by Paula et al (2011), relating extraction of N, P and K by the crop with respective total productivity and productivity per plant, according to data found in literature.…”

Section: Resultsmentioning

confidence: 87%

Phosphate fertilization influences macronutrient accumulation in watermelon cv Magnum

et al. 2018

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Studies on nutrient uptake are important to understand nutritional needs of crops, which demand may also be influenced by fertilization management, particularly P fertilization. Thus, the aim of this study was to evaluate macronutrient accumulation and distribution in watermelon cv. Magnum, under two forms of phosphate fertilization. The experiment was carried out in a sandy-textured Argisol in Mossoró-RN. The experimental design was a randomized block design, arranged in split plot in time, with four replicates. We evaluated dose of 137 kg ha-1 of P2O5 under two forms of fertilization [pre-planting (F0) and pre-planting + topdressing (F1)]. Triple superphosphate (SFT) was used for pre-planting applications and topdressing applications were done through fertigation using monoammonium phosphate (MAP, 34 kg ha-1 of P2O5). Shoot samples (stem + leaf + fruit) of the experimental plots were collected at 27, 34, 40 and 55 days after emergence (DAE), and quantitative values of the accumulated nutrients were determined. In general, the highest accumulation of macronutrients occurred in the last third of the crop cycle. General accumulation of macronutrient was altered by fertilization form. An increase in P accumulation was observed using F1 fertilization, both in total and in fruits. Macronutrient accumulation rates increased during the evaluation period, except for Ca and Mg in F1 fertilization. F1 fertilization provided higher total accumulations of Ca and Mg, but the same did not occur for the accumulation in fruits.

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Section: Resultsmentioning

confidence: 87%

Phosphate fertilization influences macronutrient accumulation in watermelon cv Magnum

et al. 2018

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“…Fertigation system comprised by two tanks connected to water pipes independently, where one of those tanks applied fertilizer in treatments of pre-planting (foundation) fertilization, and the second one applied fertilizer in pre-planting and after-planting fertigation. Fertigation was administered based on a model developed by Paula et al (2011), with the following fertilizers: urea, ammonium sulfate, calcium nitrate, monoammonium phosphate (MAP), potassium chloride, and magnesium sulfate. In total, 120 kg ha -1 of N, 90 kg ha -1 of K2O, 15 kg ha -1 of Ca, and 15 (TS) [quantified in 1.0 g of pulp using the Anthrone method and read in a spectrophotometer with absorbance at 620 nm (Yemn and Willis 1954), and results expressed in percentage (%)], reducing sugars content (RS) [measured through Somogyi-Nelson method, and results expressed in percentage (%)], total phenols content (TP) [Folin-Ciocalteau method used (Singleton et al, 1999) with a Gehaka model UV-340G spectrophotometer, and results expressed in mg GAE100 mL -1 of pulp], Vitamin C content (VC) [determined using the standard titration method of the Association of Official Analitical Chemists (AOAC 1984), and results expressed in mg of ascorbic acid 100 mL -¹ of pulp].…”

Section: Methodsmentioning

confidence: 99%

Quality of seedless watermelon cultivated under different doses and phosphorus application forms

AraÃojo¹,

Aroucha²,

Chaves³

et al. 2016

Afr. J. Agric. Res.

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Effects of doses and phosphorus application forms were studied on the postharvest quality in seedless watermelon hybrid 'Style'. For this, an experiment was conducted in Upanema/RN, Brazil, during the period of September to December 2013, in a randomized block at factorial scheme 5×2 constituting of five phosphorus doses applied in foundation (0, 76, 168, 275 and 397 kg ha -1 of P 2 O 5 ) and foundation + fertigation (0+50, 26+50, 118+50, 225+50, 347+50 kg ha -1 of P 2 O 5 ) with four replications. Fruit harvested at commercial maturity (78 days after sowing) were evaluated by average fruit weight (AFW), pulp firmness (PF), chroma index, hue angle, soluble solids content (SS), titratable acidity (TA), maturation index (MI), total phenols content (TP), vitamin C (VC), total sugars content (TS), reducing sugars content (RS) and pH. Among the quality parameters evaluated phosphorus application forms did not affect physical characteristics of fruit, but combination of application via foundation + fertigation increased VC, TS and MI. There was interactive effect of dose and phosphorus application form for the SS, TA, pH and TP. The dose of 50 kg P 2 O 5 ha -1 applied only in fertigation significantly increased values of SS, TA and TP. It is concluded that low doses of P in cultivation and its application via foundation and fertigation improved the main quality characteristics of 'Style' watermelon.

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“…A cultura é caracterizada por alta demanda de nutrientes dentro de um curto período de tempo (PAULA et al, 2011) devido seu curto ciclo.…”

Section: Introductionunclassified

Características pós-colheita de frutos partenocárpicos de melancia obtidos com uso de 2,4-D

Cavalcante

Tavares

Mendes

et al. 2017

Revista Brasileira De Tecnologia Aplicada Nas Ciências Agrárias

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ResumoO trabalho teve por objetivo avaliar características pós-colheita de frutos partenocárpicos de melancia obtidos com uso de 2,4-D. O experimento foi conduzido na Estação Experimental da Universidade Federal do Tocantins -Campus de Gurupi/Setor de Olericultura, localizado na região sul do Estado do Tocantins. Utilizou-se o delineamento experimental blocos casualizados com quatro repetições. Os tratamentos constaram da aplicação de cinco doses de 2,4-D (150, 175, 200, 225 e 250 mg L -1 ), além de um tratamento testemunha, frutos obtidos com fertilização natural. As características avaliadas foram: massa média de frutos; formato do fruto; padrão de listras; espessura da casca na região distal; coloração externa dos frutos; sólidos solúveis totais (ºBrix) e coloração de polpa. O regulador vegetal afetou todas as características avaliadas. Para formato de fruto, firmeza da polpa, coloração externa da casca e da polpa sofreram menos influência com a aplicação do regulador. Massa média de fruto, espessura da casca, ºBrix e padrão de listras foram às características mais afetadas pelo 2,4-D. Palavras-Chaves: Citrullus lanatus L., frutificação, partenocarpia, fitohormônio. Abstract Post-harvest characteristics of parthenocarpic watermelon fruits obtained with use of 2,4-DThe study aimed to evaluate post-harvest characteristics of parthenocarpic watermelon fruits obtained with use of 2,4-D, the experiment was conducted at the Experimental Station of the Federal University of Tocantins/Campus-Gurupi in the Department of Olericulture, located in the southern region of the State of Tocantins. The treatments consisted of five doses of 2,4-D (150, 175, 200, 225 and 250 mg L -1 ), plus a control treatment, which are the fruits obtained by natural fertilization. The characteristics were evaluated: average fruit weight; fruit shape; pattern of stripes; shell thickness in the distal region; External fruit color; total soluble solids (°Brix) and color of pulp. The plant regulator affected all evaluated characteristics. For fruit shape, pulp firmness, external coloring of the shell and pulp suffered less influence with the application of the regulator. Average fruit mass, bark thickness, ºBrix and striped pattern were the characteristics most affected by 2,4-D.

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Metodologia para determinação das necessidades nutricionais de melão e melancia

Cited by 15 publications

References 14 publications

Phosphate fertilization influences macronutrient accumulation in watermelon cv Magnum

Phosphate fertilization influences macronutrient accumulation in watermelon cv Magnum

Quality of seedless watermelon cultivated under different doses and phosphorus application forms

Características pós-colheita de frutos partenocárpicos de melancia obtidos com uso de 2,4-D

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