Contribuição do sistema radicular de mudas micropropagadas na absorção de nitrogênio de abacaxizeiro cultivar Vitória

Ribeiro, Danúbia Gonçalves; Vasconcellos, Marco Antônio da Silva; Araújo, Adelson Paulo

doi:10.1590/s0100-29452011000400024

Cited by 4 publications

(2 citation statements)

References 16 publications

(13 reference statements)

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“…Nitrogen fertilization is one of the factors responsible for the quality of plantlet and vegetative growth, since nitrogen is the nutrient that has an effect on the development of pineapple plants, both in the seedling production and growth, fruit development and productivity (COELHO et al, 2007b;BREGONCI et al, 2008;RIBEIRO et al, 2011;FREITAS et al, 2012).…”

Section: Introductionmentioning

confidence: 99%

Production of shoots from ‘Smooth Cayenne’ pineapple crowns with nitrogen fertilization

et al. 2020

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Abstract Pineapple fruit crowns are rarely used as planting material in Brazil. However, they can be used to produce plantlet in situations of scarcity of planting material of adequate quality. The aim of this work was to evaluate the production and nutritional status of early shoots of different sizes produced from ‘Smooth Cayenne’ pineapple crowns with nitrogen fertilization after the removal of its apical meristem. The experimental design adopted was that of randomized blocks in a 4x4 factorial scheme, with four nitrogen doses (5, 10, 15 and 20 g of urea per pot), four minimum shoot lengths at harvesting (10, 15, 20 and 25 cm), with four replicates. Under full sun cultivation conditions, crowns produced 18.11 and 6.83 shoots with 10 and 25 cm in length, respectively, up to 380 days after planting and removal of the apical meristem. Pineapple shoots harvested at 180 days presented better biometric quality and can be harvested up to 380 days after crown planting. Increasing urea doses reduce P, K and Ca levels in the dry mass of shoots.

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Section: Introductionmentioning

confidence: 99%

Production of shoots from ‘Smooth Cayenne’ pineapple crowns with nitrogen fertilization

et al. 2020

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“…However, information in respect to nutritional demands is still quite recent (Baldotto et al, 2009), leading to unbalanced use of fertilizers, possible yield losses, and low return on investment for rural producers. According to Ribeiro et al (2011), the nutritional state of the pineapple plant greatly affects plant growth and, consequently, fruit yield and quality.…”

Section: Introductionmentioning

confidence: 99%

Macronutrient uptake, accumulation and export by the irrigated 'vitória' pineapple plant

Pegoraro

Souza

Maia

et al. 2014

Rev. Bras. Ciênc. Solo

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SUMMARYThe nutritional state of the pineapple plant has a large effect on plant growth, on fruit production, and fruit quality. The aim of this study was to assess the uptake, accumulation, and export of nutrients by the irrigated 'Vitória' pineapple plant during and at the end of its development. A randomized block statistical design with four replications was used. The treatments were defined by different times of plant collection: at 270, 330, 390, 450, 510, 570, 690, 750, and 810 days after planting (DAP). The collected plants were separated into the following components: leaves, stem, roots, fruit, and slips for determination of fresh and dry matter weight at 65 ºC. After drying, the plant components were ground for characterization of the composition and content of nutrients taken up and exported by the pineapple plant. The results were subjected to analysis of variance, and non-linear regression models were fitted for the significant differences identified by the F test (p<0.01). The leaves and the stem were the plant components that showed the greatest accumulation of nutrients. For production of 72 t ha -1 of fruit, the macronutrient accumulation in the 'Vitória' pineapple exhibited the following decreasing order: K > N > S > Ca > Mg > P, which corresponded to 898, 452, 134, 129, 126, and 107 kg ha -1 , respectively, of total accumulation. The export of macronutrients by the pineapple fruit was in the following decreasing order: K > N > S > Ca > P > Mg, which was equivalent to 18, 17, 11, 8, 8, and 5 %, respectively, of the total accumulated by the pineapple. The 'Vitória' pineapple plant exported 78 kg ha -1 of N, 8 kg ha -1 of P, 164 kg ha -1 of K, 14 kg ha -1 of S, 10 kg ha -1 of Ca, and 6 kg ha -1 of Mg by the fruit. The nutrient content exported by the fruits represent important components of nutrient extraction from the soil, which need to be restored, while the nutrients contained in the leaves, stems and roots can be incorporated in the soil within a program of recycling of crop residues.Index terms: Ananas comosus var. comosus, dry matter, uptake rate. RESUMO: ABSORÇÃO, ACÚMULO E EXPORTAÇÃO DE MACRONUTRIENTES PELO ABACAXIZEIRO 'VITÓRIA' IRRIGADOO estado nutricional do abacaxizeiro tem grande influência no crescimento de suas plantas e na produção e qualidade de seus frutos. Este estudo teve o objetivo de avaliar a absorção, o acúmulo e a exportação de nutrientes pelo abacaxizeiro 'Vitória', irrigado nas fases de crescimento e produção. O delineamento estatístico utilizado foi em blocos casualizados, com quatro repetições. Os tratamentos foram definidos por distintas épocas de coleta de plantas: 270, 330, 390, 450, 510, 570, 690, 750 e 810 dias após o plantio (DAP). As plantas coletadas foram separadas nos seguintes componentes: folhas, talo, raízes, fruto e mudas, para determinar o peso de matérias fresca e seca a 65 ºC. Após secagem, os componentes das plantas foram moídos para caracterizar o teor e conteúdo de nutrientes absorvidos e exportados pelo abacaxizeiro. Os resultados foram submeti...

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Personal factors that contribute to or impair women’s ability to achieve orgasm

Lucena

Abdo

2014

Int J Impot Res

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This work aims to identify factors that contribute and those that impair the ability to experience orgasm during sexual activity. It compared women (n=96) aged 18-61 (M=38.5 years) in a stable relationship that, after a normal arousal phase, do not have an orgasm (OD) with those that do (OA) regarding sociodemographic data, sexual frequency, talking about sex with their physician, talking about sex with their partner, sexual education, masturbation, sexual desire, sexual satisfaction, depression and anxiety. We found differences between the OD and OA groups with regard to level of education (P=0.022), sex education during childhood and/or adolescence (P<0.001), masturbation (P=0.017), sexual satisfaction (P<0.001), anxiety (P<0.001) and sexual desire (P<0.001). The final model of logistic regression for orgasm problems included the variables 'masturbation', 'high school', 'sexual desire' and 'anxiety'. Orgasm difficulties are influenced by personal factors, such as anxiety and low sexual desire. Increased levels of anxiety also increase orgasmic difficulties. Women who masturbate and/or have completed high school are considerably more likely to reach orgasm during sexual activity.

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Contribuição do sistema radicular de mudas micropropagadas na absorção de nitrogênio de abacaxizeiro cultivar Vitória

Cited by 4 publications

References 16 publications

Production of shoots from ‘Smooth Cayenne’ pineapple crowns with nitrogen fertilization

Production of shoots from ‘Smooth Cayenne’ pineapple crowns with nitrogen fertilization

Macronutrient uptake, accumulation and export by the irrigated 'vitória' pineapple plant

Personal factors that contribute to or impair women’s ability to achieve orgasm

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