Antecipação do período de diagnose foliar em laranjeira 'Pêra' no Amazonas

Dias, Jairo Rafael Machado; Tucci, Carlos Alberto Franco; Wadt, Paulo Guilherme Salvador; Partelli, Fábio Luiz; Pérez, Daniel Vidal; Espindula, Marcelo Curitiba; Tomio, Denis Borges

doi:10.1590/s0100-204x2013000700008

Cited by 9 publications

(8 citation statements)

References 20 publications

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“…Thus, as the reproductive organs are preferred drains, the trend is that these elements are mobilized from leaf to fruit (DIAS et al, 2013). Similar results were observed by SALOMÃO et al (2006) when studying the variation in mineral composition in litchi leaves and stem.…”

Section: Resultssupporting

confidence: 75%

Nutrient Contents in ‘Tommy Atkins’ Mango Leaves at Flowering and Fruiting Stages

et al. 2016

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ABSTRACT:The objective of this study was to evaluate the nutrient contents in 'Tommy Atkins' mango leaves at the flowering and fruiting stages under different strategies to reduce irrigation levels during flower induction. Five irrigation level reduction strategies, based on crop evapotranspiration (ETc) were used in the plots: T1 (0% ETc), T2 (25% ETc), T3 (50% ETc), T4 (75% ETc) and T5 (100% ETc); two production cycles in the split-plots; and in two development stages, flowering and harvest, in the split-split plots. The content of N, P, K, Ca, Mg, and S, as well as B, Cu, Fe, Mn, Zn, and Na was determined and leaf chlorophyll index was measured during the second cycle. The content of P, K, Mg, and Cu in the 'Tommy Atkins' mango trees leaves varied according to phases and cycles, regardless of the strategies to reduce irrigation levels in floral induction. The contents of N, Ca, B, Fe, Mn, and Na varied with stages and with the production cycles, in an independent manner. Foliar N contents were above the sufficiency range at the different development stages and cycles evaluated. The indices of a, b, and total chlorophyll varied independent of reading time. The nutrient contents with lower mobility in the plant, Ca, B, Fe and Mn increase in 'Tommy Atkins' mango trees leaves from flowering to fruiting, with the return of irrigation at 100% crop evapotranspiration, while the levels of N, P, K and Mg, nutrients with high mobility in plant decrease.

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Section: Resultssupporting

confidence: 75%

Nutrient Contents in ‘Tommy Atkins’ Mango Leaves at Flowering and Fruiting Stages

et al. 2016

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“…A definição dos valores de referência, com os métodos baseados no balanço nutricional, consiste da determinação de faixas de teores nutricionais de um conjunto de plantas que sejam consideradas nutricionalmente equilibradas (Dias et al, 2013a;Kurihara et al, 2013). Para os demais métodos citados, esses valores de referência são obtidos a partir do cálculo da probabilidade de se obterem produtividades satisfatórias, em diversas classes de teores nutricionais (ChM), ou do valor da distribuição normal dos teores do nutriente que correspondem a 90% da produtividade esperada (DNR).…”

Section: Gilson Sergio Bastos De Matosunclassified

Níveis críticos e faixas de suficiência de nutrientes derivados de métodos de avaliação do estado nutricional da palma-de-óleo

Matos

Fernandes

Wadt

2016

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi determinar níveis críticos e faixas de suficiência de nutrientes para a palma-de-óleo (Elaeis spp.), a partir de métodos de avaliação do estado nutricional das plantas. Utilizaram-se os métodos chance matemática (ChM), sistema integrado de diagnose e recomendação (DRIS) e diagnose da composição nutricional (CND), além da avaliação do nível crítico obtido pela distribuição normal reduzida (DNR) em dados de produtividade e do teor de nutrientes de 144 amostras foliares de plantios no Pará. As regressões dos índices DRIS e CND com os teores foliares foram todas significativas, e o menor coeficiente de determinação foi encontrado para N. Os intervalos das faixas de suficiência obtidos com os métodos ChM, DRIS e CND nos talhões nutricionalmente equilibrados foram, em geral, mais estreitos do que os reportados na literatura, com poucos diagnósticos concordantes, sobretudo para K. Os níveis críticos obtidos pela DNR situaram-se dentro do intervalo das faixas nutricionais obtidas com os outros métodos. Os métodos ChM, DRIS, CND e DNR são adequados para a obtenção de valores de referência nutricionais e indicaram N, Ca, S, Mn e Zn como os nutrientes com maior frequência de deficiência nos talhões de palma-de-óleo avaliados.Termos para indexação: Elaeis guineensis, Elaeis oleifera, chance matemática, diagnose da composição nutricional, DRIS, nutrição de plantas. Critical levels and nutrient sufficiency ranges derived from methods for assessing the nutritional status of oil palmAbstract -The objective of this work was to determine critical levels and nutrient sufficiency ranges for oil palm (Elaeis spp.), using methods for assessing the nutritional status of the plants. The methods of mathematical chance (ChM), diagnosis and recommendation integrated system (DRIS), and compositional nutrient diagnosis (CND), besides the critical level obtained by the reduced normal distribution (DNR), were used in productivity data and in nutrient content of 144 leaf samples of oil palm plantations in the state of Pará, Brazil. The regressions of the DRIS and CND indexes with leaf nutrient contents were all significant, and the lowest coefficient of determination was found for N. The sufficiency range intervals obtained with the ChM, DRIS, and CND methods in the nutritionally balanced stands were, in general, narrower than the ones reported in the literature, with few concordant diagnostics, mainly for K. The critical levels obtained with DNR were within the nutritional range intervals obtained with the other methods. ChM, DRIS, CND, and DNR are suited methods for obtaining nutritional reference values, and they indicated N, Ca, S, Mn, and Zn as the nutrients with the highest frequency of deficiency in the evaluated oil palm orchards.

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“…The nutrients N and K show high mobility in the phloem and a large degree of translocation (Silva et al, 2020;Sampaio et al, 2021). As the reproductive organs have priority, these nutrients are commonly mobilized from the leaf to the fruit (Dias et al, 2013). However, Ca and B accumulate in leaf tissues as plants develop because of their limited mobility in the phloem (Dias et al, 2013;Llanderal et al, 2019;Llanderal et al, 2021).…”

Section: Resultsmentioning

confidence: 99%

“…As the reproductive organs have priority, these nutrients are commonly mobilized from the leaf to the fruit (Dias et al, 2013). However, Ca and B accumulate in leaf tissues as plants develop because of their limited mobility in the phloem (Dias et al, 2013;Llanderal et al, 2019;Llanderal et al, 2021). This may explain the common problem of internal collapse in mango fruits in the São Francisco Valley region.…”

Section: Resultsmentioning

confidence: 99%

Nutritional diagnosis of mango plants post-harvest in anticipation of pre-flowering avoids nutritional stress

Rezende

Freire

Silva

et al. 2023

Rev. bras. eng. agríc. ambient.

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The São Francisco Valley region of Brazil is a leading exporter of mango fruits. Previous nutritional diagnosis can identify stresses, provide adjustments for nutritional limitations, and promote more efficient fertilization and nutrient management. This study aimed to compare the nutritional diagnosis of mango trees in the post-harvest and pre-flowering phases and to correlate them with productivity. Norms and indices of the Integrated System of Diagnosis and Recommendation (DRIS), as well as the Nutritional Balance Index and the Potential of Response to Fertilization were generated for each phenological phase of the mango trees. Optimal concentrations and ranges of nutrients were established, classified as deficient, balanced, or excessive, and subsequently compared to each other and to values recommended in the literature. The indices were correlated with the productivity of the orchards in each phenological phase of the mango trees. When comparing the DRIS norms of post-harvest and pre-flowering phenological phases, 55% of the averages differed. The sufficiency ranges of the post-harvest and pre-flowering phases were generally different from those referenced in the literature. Nutritional diagnoses for P, K, Ca, Mg, S, Zn, and Cl altered between phenological phases. The nutritional diagnosis performed in the post-harvest phase showed that nutritional imbalance affected productivity.

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Antecipação do período de diagnose foliar em laranjeira 'Pêra' no Amazonas

Cited by 9 publications

References 20 publications

Nutrient Contents in ‘Tommy Atkins’ Mango Leaves at Flowering and Fruiting Stages

Nutrient Contents in ‘Tommy Atkins’ Mango Leaves at Flowering and Fruiting Stages

Níveis críticos e faixas de suficiência de nutrientes derivados de métodos de avaliação do estado nutricional da palma-de-óleo

Nutritional diagnosis of mango plants post-harvest in anticipation of pre-flowering avoids nutritional stress

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