Dose de nitrogênio associada à produtividade de batata e índices do estado de nitrogênio na folha

Coelho, Fabrício Silva; Fontes, Paulo Cézar Rezende; Puiatti, Mário; Neves, Júlio César Lima; Silva, Marcelo Cleón de Castro

doi:10.1590/s0100-06832010000400017

Cited by 42 publications

(48 citation statements)

References 26 publications

(26 reference statements)

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“…Varios trabajos recomiendan la utilización del medidor de clorofila Minolta SPAD-502 para la evaluación del estado nutricional de una planta con relación al nitrógeno, en lechuga (León et al, 2007), algodón (Motomiya et al 2009), papa (Gianquinto et al 2003, Coelho et al 2010, remolacha (Sexton & Carroll 2002), café (Reis et al 2006), Panicum maximum Jacq. cv.…”

Section: Introductionunclassified

Indice SPAD en el crecimiento y desarrollo de plantas de lisianthus en función de diferentes dosis de nitrógeno en ambiente protegido

Cunha

Katz²,

Sousa

et al. 2015

Idesia

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Volumen 33, Nº 2. Páginas 97-105 IDESIA (Chile) Marzo-Mayo, 2015 Índice SPAD en el crecimiento y desarrollo de plantas de lisianthus en función de diferentes dosis de nitrógeno en ambiente protegido SPAD RESUMENEl cultivo de lisianthus en Brasil es poco estudiado con relación a las condiciones ideales de cultivo, principalmente con relación al estado nutricional de las plantas. El diagnóstico del estado nutricional de la planta con relación al nitrógeno puede ser hecho por medio del análisis de su contenido en la hoja. El objetivo de este estudio fue evaluar el crecimiento y desarrollo de plantas de lisianthus en maceteros con diferentes dosis de nitrógeno en ambiente protegido, y a partir de esto, establecer un valor crítico del índice de clorofila (SPAD) en las hojas para el monitoreo de la necesidad de nitrógeno. El diseño experimental fue totalmente al azar con seis tratamientos y parcelas subdivididas, constituido por seis dosis de nitrógeno en la forma de nitrato de amonio (50, 100, 150, 200, 250 y 300 mg macetero -1 ). El SPAD fue obtenido en las hojas mediante un medidor de clorofila SPAD-502 para identificar el momento exacto en que hay necesidad de nitrógeno. El modelo polinomial cuadrático creciente representó el desarrollo fisiológico de la planta con relación al aumento de la dosis de nitrógeno con tendencia de correlación positiva. El modelo polinomial cuadrático decreciente representó la disminución del SPAD al largo del crecimiento de la planta, y también con relación al aumento de la disponibilidad de la radiación fotosintéticamente activa. La mayor disponibilidad de radiación fotosintéticamente activa solamente aumenta el SPAD se hay aumento de la dosis de nitrógeno. El período de más necesidad de nitrógeno fue establecido en función del SPAD, entre 63 y 105 DDPi (días después del pinzado "pinch") y con índices SPADs de 52,14 a 52,78, asociado a la mayor dosis de nitrógeno (300 mg) y al intervalo de 233 a 261 Wm -2 de radiación fotosintéticamente activa, responsables por el mayor número de botones florales de lisianthus. Palabras clave: Eustoma grandiflorum; clorofilómetro; radiación fotosintéticamente activa. (50, 100, 150, 200, 250 and 300 mg/pot ABSTRACT The cultivation of lisianthus in Brazil is little studied in relation to the ideal growing conditions, especially with regarding the nutritional status of plants. The diagnosis of nutritional status in relation to plant nitrogen can be done through analysis of its contents in the leaf. The aim was to evaluate the growth and development of plants of lisianthus in pots under different nitrogen levels in a protected environment, and then establish a critical value of the chlorophyll content or SPAD on the leaves of the need for monitoring of nitrogen. The design was completely randomized with six treatments and a split plot, consisting of six levels of nitrogen as ammonium nitrate

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Section: Introductionunclassified

Indice SPAD en el crecimiento y desarrollo de plantas de lisianthus en función de diferentes dosis de nitrógeno en ambiente protegido

Cunha

Katz²,

Sousa

et al. 2015

Idesia

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“…Estudos verificaram que o teor de clorofila esta intrinsecamente ligado ao estado nutricional das plantas em diferentes espécies, incluindo espécies pertencentes à família das cucurbitáceas, em relação ao nitrogênio (COELHO et al, 2010;PÔRTO et al, 2011). Nesse sentido, é possível inferir que o nitrogênio que compõe a estrutura molecular da niacina possa ter sido o responsável pelo incremento desses teores.…”

Section: Resultsunclassified

Doses e parcelamento de niacina no desenvolvimento inicial de meloeiro Cantaloupe

Vendruscolo

Martins

Seleguini

2017

AGRO@MBIENTE ON-LINE

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Resumo: A utilização de vitaminas na produção vegetal tem sido voltada para o suprimento de elementos ou visando ação de bioestimulante. No entanto, informações acerca do uso desses compostos são escassas, o que justifica novos estudos que demonstrem os efeitos sobre os vegetais. Assim, objetivou-se com o presente trabalho determinar a melhor dose e o adequado parcelamento da aplicação de niacina para a melhoria das características biométricas de mudas de meloeiro Cantaloupe. O delineamento experimental foi o de blocos ao acaso, em esquema fatorial 4x2, com quatro repetições. Os tratamentos foram compostos por quatro doses de niacina (0; 25; 50; 75 mg L -1 ) e dois níveis de parcelamento da dose (a cada 8 dias aplicação da dose total ou parcelada à metade, a cada 4 dias). Trinta e dois dias após a semeadura, foi medido o teor de clorofila, altura, diâmetro do coleto, número de folhas, área foliar média, comprimento de raiz e massa seca de parte aérea e raiz. A aplicação de niacina teve efeito quadrático sobre as variáveis de teor de clorofila, diâmetro do coleto, número de folhas, comprimento e massa seca de raiz. Dessa forma, para as condições em que o estudo foi desenvolvido, a aplicação de niacina via fertirrigação, até a concentração 29,4 mg L -1 , melhora o desenvolvimento inicial de meloeiro Cantaloupe, independente dos níveis de parcelamento. Palavras-chave:Cucumis melo L. Horticultura. Nicotina. Produção de mudas. Vitamina B6. Abstract:The use of vitamins in plant production has been focused for the supply of components or aiming biostimulant action. However, information about the use of these compounds is scarce, which justifies new studies demonstrating the effects on plants. The objective was to determine the optimal dose and proper parceling of the application of niacin to improve the biometric characteristics of Cantaloupe melon seedlings. The experimental design was randomized blocks in a 4x2 factorial scheme, with four replications. The treatments consisted of four doses of niacin (0; 25; 50; 75 mg L -1 ) and two levels of installment of the dose (every 8 days application of full dosage or split in half, every 4 days). 32 days after sowing were measured chlorophyll content, height, diameter at the neck, leaf number, mean leaf area, root length and dry weight of shoot and root. The application of niacin had a quadratic effect on the chlorophyll content of variable diameter at the neck, leaf number, root length and dry weight. Thus, for the conditions under which the study was developed, the application of niacin fertigation until the concentration 29.4 mg L -1 , improves the initial development of melon Cantaloupe, regardless of the installment levels.

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“…Relative levels of chlorophyll were higher in treatments with 80 and 120 kg N ha -1 (Figure 3), which are 13.6 and 21% higher than the control treatment, respectively, at 29 DAS. According to Coelho et al (2010), nitrogen supply is associated with the relative contents in the chlorophyll molecule, because it is present in it. Brighenti (2012) average ICF value of 35.3.…”

Section: Resultsmentioning

confidence: 99%

Viability of Biofertilizer Produced by an Indian Biodigester Prototype Applied to Sunflower Plants

Moura¹,

Teixeira²,

Gondim³

et al. 2017

JAS

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Biodigesters have been used to convert biomass into biogas and biofertilizers. This energy use has been important for the reduction of solid waste pollution in the environment. This work aims to analyse the viability of the use of pig biofertilizer produced by an Indian biodigester prototype, monitored by a data acquisition system. The biodigester used was an Indian prototype built on a low cost material that is easy to acquire (polyvinyl chloride-PVC). After the biofertilizer production, we tested its efficiency and viability under conditions of vegetation house in the cultivation of sunflower plants. The experimental design was completely randomized in a factorial arrangement with 4 concentrations of biofertilizer (0, 40, 80 and 120 kg N ha -1 ) × 4 harvest periods (14, 21, 25 and 29 days after sowing). We evaluated biometric and vigor parameters by measurements of stem diameter, height of the aerial part, number of leaves and production of fresh and dry matter of roots, aerial and total parts, as well as the relative chlorophyll content. We performed the experiment with five repetitions using two plants each and we submitted the data to analysis of variance (ANOVA) and polynomial regression using the statistical software Sisvar 5.4. The functional Indian biodigester prototype produced a biofertilizer of excellent quality and viability as a biofertilizer for the initial growth of sunflower plants. The biofertilizer served as a nutritional source in the sunflower crop, since it provided increases in all the growth parameters analyzed in relation to the control group (plants in the absence of biofertilizer), especially in the concentration of 120 kg N ha -1 .

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Dose de nitrogênio associada à produtividade de batata e índices do estado de nitrogênio na folha

Cited by 42 publications

References 26 publications

Indice SPAD en el crecimiento y desarrollo de plantas de lisianthus en función de diferentes dosis de nitrógeno en ambiente protegido

Indice SPAD en el crecimiento y desarrollo de plantas de lisianthus en función de diferentes dosis de nitrógeno en ambiente protegido

Doses e parcelamento de niacina no desenvolvimento inicial de meloeiro Cantaloupe

Viability of Biofertilizer Produced by an Indian Biodigester Prototype Applied to Sunflower Plants

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