Época de amostragem foliar para diagnóstico nutricional em bananeira

Maia, Celsemy Eleutério

doi:10.1590/s0100-06832012000300016

Cited by 8 publications

(4 citation statements)

References 4 publications

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“…Accordingly to Maia (2012), after the maximum efficiency of N dose, continues to plant uptake and the content of this nutrient continues an increasing in plant tissue, which causes toxicity or an induced deficiency of other nutrients, such changes may reflect a visual symptoms of plant toxicity or a nutritional imbalance, which were observed in this research (Figures 4a, 4b). …”

Section: Macronutrient Contentssupporting

confidence: 53%

Nutrient contents and fertirrigation in camu camu (Myrciaria dubia (Kunth) McVaugh) crop with different nitrogen doses

et al. 2018

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Camu-camu (Myrciaria dubia (Kunth) McVaugh) is a native fruit tree, which is in domestication process, therefore, knowledge of nutritional needs is essential to improve the fertilization efficiency throughout plant development. The aim of this research was to determine the nutrient content of camu-camu plants as a function of nitrogen fertilization via fertirrigation in the first year of cultivation. An experiment was carried out in a randomized complete block design, with 5 treatments as follows: 0; 40; 80; 120 and 160 kg.ha -1 of N, eight replicates and seven plants per experimental unit. The evaluated variables were as follows: total dry matter and nutrient contents in camu-camu leaves. The results show total dry matter of camu-camu plants, which were performed a significant quadratic behavior in response to increasing N doses. In Fact, N doses greater than 128 kg.ha -1 aroused a depressive effects. In addition, leaf contents of N, K, and Ca, had achieved a significant quadratic response and highest concentrations were recorded between 113 and 115 kg of N.ha -1 . On the other hand, micronutrients had a polynomial depressive behavior according to an increasing N doses. It can be concluded that nutrient foliar contents are adequate for the camu-camu plants development. In fact, N, Ca, K, Fe, Mn and B, were the most required nutrients. Micronutrients determined in leaves, corresponded to the following decreasing order: N> Ca> K> Mg> S> P> Mn> Fe> B> Zn> Cu, respectively. Key Words: Dry matter, micronutrients, nutrient balance (plants), plant development, plant nutrition. ResumoO camu-camu (Myrciaria dubia (Kunth) McVaugh) é uma fruteira nativa que está em processo de domesticação, portanto, o conhecimento das necessidades nutricionais é essencial para melhorar a eficiência da adubação durante seu desenvolvimento. O trabalho teve como objetivo determinar os teores de nutrientes em plantas de camu-camu em função da adubação nitrogenada via fertirrigação no primeiro ano de cultivo. O experimento foi conduzido mediante delineamento experimental em blocos casualizados, com 5 tratamentos: 0; 40; 80; 120 e 160 kg ha -1 de N, oito repetições e sete plantas por unidade experimental. As variáveis avaliadas foram a massa seca total e os teores de nutrientes nas folhas. Os resultados mostram que a massa seca total das plantas de camu-camu apresentou comportamento quadrático significativo em resposta às doses crescentes de N, sendo que doses maiores a 128 kg ha -1 propiciaram efeitos depressivos. Além disso, os teores foliares de N, K, Ca tiveram uma resposta quadrática significativa, sendo que as maiores concentrações foram registradas entre as doses de 113 e 115 kg de N ha -1 . Por outro lado, os micronutrientes tiveram um comportamento polinomial depressivo de acordo com os incrementos das doses de N. Pode-se concluir que os teores foliares dos nutrientes estão dentro dos adequados para o desenvolvimento das plantas de camu-camu, e os nutrientes mais exigidos foram o N, Ca, K, Fe, Mn e B, e finalmente os teores de...

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Section: Macronutrient Contentssupporting

confidence: 53%

Nutrient contents and fertirrigation in camu camu (Myrciaria dubia (Kunth) McVaugh) crop with different nitrogen doses

et al. 2018

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“…In season, Zn occurred at higher levels in reproductive structures, but in the offseason the highest Zn contents were observed in leaves, i.e., the highest contents occurred in the organs with the lowest DM accumulation. This occurs because as the plant grows, there is nutrient concentration dilution in tissues, so that physiologically young and less developed tissues, in general, have higher concentrations (Maia, 2012), specially of nutrients with a certain plant phloem mobility, such as Zn (Rodrigues et al, 1997). In both growing seasons, B, Cu, Fe, and Mn contents were higher in leaves (Table 2), which is a 47 result of their low mobility in tissues (Malavolta et al, 1997;Malavolta, 2006).…”

Section: Resultsmentioning

confidence: 99%

Dry matter and nutrient partitioning in Castor plants in two growing seasons

Castro¹,

Crusciol²,

Fernandes³

et al. 2017

Científica

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The aim of the present study was to evaluate dry matter partitioning and macro-and micronutrient accumulation and distribution in small-sized castor plants grown in season and off-season. The experiments were conducted during the 2005-2006 season and in the 2006 off-season in an Oxisol. A completely randomized block design was used, with eight replications. Plots consisted of plant sampling periods, which were conducted in the vegetative period (17 days after emergence -DAE), the grain fill period (between 73 and 80 DAE) and at end of the cycle (120 DAE). Castor leaves accumulated most of dry matter (DM) and macroand micronutrients in the vegetative period, regardless of the growing period. In the following cycle periods, most of biomass and nutrients were located in the reproductive structures and grains, especially in the offseason crop. It was concluded that leaves and stems are strong nutrient sinks in the castor plant in season crops, while lower water availability during off-season induces plants to use physiological mechanisms to allocate more resources (biomass and nutrients) for their reproduction.Additional keywords: dry matter; macronutrients; micronutrients; Ricinus communis; source/sink relation. ResumoObjetivou-se neste estudo avaliar a partição de matéria seca, o acúmulo e a distribuição de macro e micronutrientes em mamona de porte baixo, cultivada na safra e na safrinha. Os experimentos foram conduzidos na safra de 2005-2006 e na safrinha de 2006, em Latossolo Vermelho distroférrico. Utilizou-se do delineamento em blocos casualizados, com oito repetições. As parcelas foram constituídas pelas épocas de coleta de plantas, que foram realizadas na fase vegetativa (17 dias após a emergência -DAE), na fase de enchimento de grãos (entre 73 e 80 DAE) e no final do ciclo (120 DAE). As folhas da mamoneira, na fase vegetativa, acumularam a maior parte da matéria seca (MS) e dos macros e micronutrientes, independentemente da época de cultivo. Nas fases seguintes do ciclo, a maior proporção de biomassa e nutrientes estava presente nas estruturas reprodutivas e nos grãos, especialmente no cultivo de safrinha. Conclui-se que, no cultivo de safra, as folhas e os caules são fortes drenos de nutrientes na planta de mamona, enquanto na safrinha a menor disponibilidade hídrica faz com que as plantas utilizem mecanismos fisiológicos para alocar mais recursos (biomassa e nutrientes) para sua reprodução.Palavras-chave adicionais: macronutrientes; matéria seca; micronutrientes; relação fonte/dreno; Ricinus communis.

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“…For N, K, Mg, Mn and Zn, these differences were higher at harvest time. This result suggests that the final stages are most adequate for sampling and foliar diagnosis in carrot crops, because a higher plant growth decreases the possibility of errors related to the nutrient concentration and dilution in dry matter (Maia 2012, Gonçalves et al 2017.…”

Section: Variablementioning

confidence: 96%

Foliar indices for carrot crop using the compositional nutrient diagnosis method1

Silva

Oliveira

et al. 2017

Pesqui. Agropecu. Trop.

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Carrot has a high yield potential, which requires an adequate and adaptable nutritional management, according to the needs and demands of each crop. Foliar diagnosis is a tool for adjustment and constant improvement of crop fertilization programs. This study aimed to determine leaf indices and reference values using the compositional nutrient diagnosis (CND) method, at three phenological stages of carrot crops [40 and 70 days after sowing (DAS) and at harvest]. In order to calculate the CND method, a database was created with leaf contents of the nutrients N, P, K, Ca, Mg, S, B, Cu, Mn and Zn and root yields, in commercial carrot crops. The nutrient limitation order was generated according to the fertilization response potential. At 70 DAS and at harvest, Mg and Mn were the most limiting nutrients by deficiency, while Zn was the most limiting by excess at 70 DAS, and P and Ca were the most limiting by excess at harvest. The results indicate that the foliar diagnosis performed with the CND method is only effective for the correction of nutritional disturbances in subsequent crops.

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Época de amostragem foliar para diagnóstico nutricional em bananeira

Cited by 8 publications

References 4 publications

Nutrient contents and fertirrigation in camu camu (Myrciaria dubia (Kunth) McVaugh) crop with different nitrogen doses

Nutrient contents and fertirrigation in camu camu (Myrciaria dubia (Kunth) McVaugh) crop with different nitrogen doses

Dry matter and nutrient partitioning in Castor plants in two growing seasons

Foliar indices for carrot crop using the compositional nutrient diagnosis method1

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