Índices para avaliar o estado de nitrogênio da batata multiplicada por distintos materiais propagativos

Moreira, M. A.; Fontes, Paulo Cézar Rezende; Cecon, Paulo Roberto; Araújo, Roberto Fontes

doi:10.1590/s0034-737x2011000300020

Cited by 6 publications

(9 citation statements)

References 22 publications

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“…The plant also reached its peak nitrogen accumulation. Similar results were found by several authors (Minotti et al, 1994;Rodrigues, 2004;Junior Sampaio, 2005;Moreira et al, 2011a). Table 2.…”

Section: Resultssupporting

confidence: 90%

“…Although there are a number of studies establishing indices to assess the nitrogen status of potato plants Junior Sampaio et al, 2008, Silva et al, 2009, 2011Braun et al, 2010;Busato et al, 2010;Coelho et al, 2010;Fontes et al, 2010;Moreira et al, 2011a) and the nitrogen management in minitubers production in vases and other systems containing substrate (Junior Sampaio, 2005 ;Moreira, 2008), there is still a lack of research to determine the critical value of these indices in the production system of basic seed potatoes multiplication by sprouts in substrate. This study aimed to determine the optimal dose of nitrogen (N) in the production of basic seed potatoes minitubers and to evaluate the effect of nitrogen (N) rates on nitrogen and physiological indices both in the youngest fully developed leaf (fourth leaf) and in the oldest leaf at 60 days after planting.…”

Section: Introductionmentioning

confidence: 99%

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Production of basic potato seed minitubers in substrate and different nitrogen rates

Souza

Fontes

Moreira³

et al. 2012

Rev. Ceres

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RESUMO Produção de minitubérculos de batata-semente básica em substrato em razão de doses de nitrogênioA dose ótima de nitrogênio (N) na cultura da batata depende do sistema de produção. O objetivo deste trabalho foi determinar a dose ótima de N para a produção de minitubérculos de batata-semente básica e avaliar o efeito de doses de N sobre índices nitrogenados e fisiológicos determinados na folha mais jovem completamente desenvolvida (quarta folha) e na folha mais velha da planta, aos 60 dias após o plantio. O experimento foi realizado em ambiente protegido, no Departamento de Fitotecnia da Universidade Federal de Viçosa. Os tratamentos foram constituídos por cinco doses de N (0, 45, 90, 180 e 360 mg dm -3 ), sendo 10% de cada dose aplicada em pré-plantio e o restante via água de irrigação, diariamente, por 30 dias. As doses de N influenciaram positivamente os índices fisiológicos (comprimento, largura, área foliar, número de folíolos, massas de matérias fresca e seca) e nitrogenados (teor e conteúdo de N e N-NO 3 na matéria seca e índice SPAD) tanto na quarta folha quanto na folha velha. Da mesma forma, doses de N influenciaram positiva- The optimal dose of nitrogen (N) in potato crop depends on the production system. The objective of this study was to determine the optimal dose of N for the production of basic potato seed minitubers and evaluate the effect of N rates on physiological and nitrogen indices in the youngest fully developed leaf (fourth leaf) and in the oldest leaf of the plants at 60 days after planting. The experiment was conducted in a greenhouse at the Departamento de Fitotecnia da Universidade Federal de Viçosa. The treatments consisted of five N rates (0, 45, 90, 180 and 360 mg dm -3 ), with 10% of each dose applied at planting and the remainder through irrigation water, daily, for 30 days. The nitrogen rates positively influenced the physiological indices (length, width, leaf area, number of leaves, fresh mass and dry mass) and nitrogen in the dry mass and SPAD) both in the fourth leaf and in the oldest leaf. Likewise, the N rates positively influenced the number and mass of harvested tubers. The largest number (5.44 tubers/plant) and the maximum mass of tubers (243.5 g/plant) were obtained with 360.0 and 332.9 mg N dm -3 , respectively. Therefore, the mass and number of tubers were not optimized by the same N rate. The critical SPAD index was 38.8 in the fourth leaf, which was more sensitive to the effect of N rates than the oldest leaf.

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Section: Resultssupporting

confidence: 90%

Section: Introductionmentioning

confidence: 99%

Production of basic potato seed minitubers in substrate and different nitrogen rates

Souza

Fontes

Moreira³

et al. 2012

Rev. Ceres

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“…Additionally, morphological and physiological plant characteristics (e.g. leaf area and dry matter, leaf number, and plant height), which are easily determined in a nondestructive manner, have been suggested as proxy indexes for plant N status (complementary to green leaf analysis) (Fontes, 2001;Coelho and Fontes, 2005;Moreira et al, 2011;Yin et al, 2011).…”

Section: Introductionmentioning

confidence: 99%

Tuber yield prognosis model and agronomic nitrogen use efficiency of potato cultivars

Fontes¹,

Braun²,

Silva³

et al. 2016

Aust J Crop Sci

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Adjusting nitrogen (N) fertilization rates to crop requirements optimizes N efficiency and reduces environmental pollution. In accordance with such precision agriculture, methods facilitating rapid and simple real-time crop yield prognostication are desirable. The aims of this study are to establish a prognostic model for tuber yield; early characterization of a properly N-nourished plant and to determine the N use efficiency by the Asterix and Atlantic potato cultivars. In two separate experiments, on for each cultivar, five pre-planting N fertilization rates (0, 50, 100, 200, and 300 kg ha-1) were evaluated. A randomized complete block design with four replicates per experiment was utilized. Variable chosen for early evaluation, 21 days after emergence, were categorized into four named groups. Group one, linked to chlorophyll (SPAD index and total fourth leaf chlorophyll concentration). Group two, concerning with physiological indexes (leaf, fourth leaf, stem, and shoot dry matter; fourth-and whole-plant leaf area; fourth leaf and plant specific leaf area; and leaf area ratio). The third group linked to fourth leaf N indexes (N concentration per unit dry matter and per unit leaf area, and total N content). The fourth group referring to N use efficiency (fourth leaf N use efficiency and agronomic N use efficiency). For both cultivars, there are a significant positive correlation between tuber yield and physiologic and N indexes, while there is a significant negative correlation between tuber yield and N use efficiency. Regression models utilising the SPAD index as an independent variable are effective in predicting the marketable tuber yield of potato plants, and have the added advantage of real-time determination of the SPAD index in relationship a another methods.

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“…Para a batata, são citadas análises com o uso de tabela de cor (Moreira et al, 2011), teor de nitrato no suco celular (Bélanger et al, 2003) e clorofilômetro Spad-502 (Uddling et al, 2007;Coelho et al, 2010).…”

Section: Introductionunclassified

Avaliação do estado nutricional do nitrogênio em batateira por meio de polifenóis e clorofila na folha

Coelho

Fontes

Finger

et al. 2012

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar o efeito de doses de N sobre índices fisiológicos relacionados à nutrição nitrogenada e verificar a possibilidade de estimar indiretamente os teores foliares de N em batata. Foram avaliados os índices de flavonóis (IFLV), de clorofila (ICHL) e de balanço de N (IBN), e as estimativas dos teores foliares de N foram realizadas aos 21 e 42 dias após a emergência, por meio do medidor portátil Dualex. O experimento foi conduzido de novembro de 2010 a fevereiro de 2011, em delineamento de blocos ao acaso, e os tratamentos consistiram de cinco doses de N (0, 50, 100, 200 e 300 kg ha -1 de N, na forma de ureia) aplicadas em pré-plantio, com quatro repetições. Houve aumento no ICHL e no IBN e decréscimo no IFLV com o aumento das doses de N. Os índices determinados com o medidor Dualex correlacionaram-se com os teores de N e de clorofila extraível na quarta folha, bem como com o rendimento de tubérculos na safra. O Dualex pode ser utilizado para avaliar o estado nutricional de N em batateira e prognosticar a produtividade de tubérculos.Termos para indexação: Solanum tuberosum, avaliação em tempo real, balanço nutricional, clorofila, compostos fenólicos, flavonóis. Evaluation of potato nitrogen status based on polyphenol and chlorophyll leaf contentAbstract -The objective of this work was to evaluate the effect of N rates on physiological indexes related to nitrogen nutrition in potato, and to verify the possibility of indirectly estimating leaf N contents. Flavonol (FLVI), chlorophyll (CHLI), and the nitrogen balance (NBI) indexes were evaluated, and estimations of leaf N contents were made at 21 and 42 days after emergence using the Dualex leaf-clip instrument. The experiment was carried out from November 2010 to February 2011, in a randomized complete block design, with five N rates (0, 50, 100, 200, and 300 kg ha -1 of N, applied as urea) at pre-planting, and four replicates. There was an increase in CHLI and NBI and a decrease in FLVI with the increasing N doses. The indexes determined with Dualex were correlated with N and extractable chlorophyll content in the fourth leaf and with potato tuber yields. Dualex can be used to evaluate N nutritional status in potato plants, and for the prognosis of final tuber yield with readings.

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Índices para avaliar o estado de nitrogênio da batata multiplicada por distintos materiais propagativos

Cited by 6 publications

References 22 publications

Production of basic potato seed minitubers in substrate and different nitrogen rates

Production of basic potato seed minitubers in substrate and different nitrogen rates

Tuber yield prognosis model and agronomic nitrogen use efficiency of potato cultivars

Avaliação do estado nutricional do nitrogênio em batateira por meio de polifenóis e clorofila na folha

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