Nutrição mineral de hortaliças: horizontes e desafios para um agrônomo

Fontes, Paulo Cesar R.

doi:10.1590/s0102-05362014000300002

Cited by 7 publications

(8 citation statements)

References 27 publications

(6 reference statements)

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“…Therefore, in this condition, Al 3+ no longer exerted toxicity on the plants. With the use of the maximum limestone dose, the TDM yield decreased, indicating that despite the increase of availability of nutrients to a greater extent than the requirement by the plants, there is no need to increase its concentration in the solution because the addition will not increase the yield of the plants (Fontes et al, 2014).…”

Section: Relationship Between Cations and Anions Activity With Aluminmentioning

confidence: 99%

Composition, chemical speciation and activity of ions in the solution of Brazilian acid soils

Cunha

Almeida

Ernani

et al. 2018

Agraria

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The knowledge of the chemical composition of the soil solution through chemical speciation is important for the monitoring of nutrient availability, soil fertility management and plant nutrition. The objective of this study was to evaluate the chemical composition and activity of Al, cations and anions by chemical speciation in solution of some Brazilian acid soils (AC, PE, RS and SC) submitted to liming and cultivated with soybean and maize plants. In addition, to identify the chemical elements responsible for the reduction of Al activity in the solution and its toxicity to plants. The predominant aluminum, calcium, magnesium, potassium, sulfate, chloride and nitrate species in all soils were: Ca 2+ and Mg 2+ , K + , SO 4 2-, Cland NO 3 in all soils. In the treatments without limestone in the soils AC9, RS and CB predominated the species of P H 2 PO 4 and in the soils PE and BR was the AlHPO 4 + . However, with liming the P form that predominated in all soils was H 2 PO 4 and, to a lesser extent, HPO 4 2-. The activity of the Ca 2+ and Mg 2+ ions was the main responsible for the neutralization of the toxic effects of Al 3+ in the evaluated plants.Composição, especiação química e atividade de íons na solução de solos ácidos brasileiros RESUMO: O conhecimento da composição química da solução do solo, por meio da especiação química, é importante para o acompanhamento da disponibilidade de nutrientes para o manejo da fertilidade do solo e da nutrição de plantas. O estudo objetivou avaliar a composição química e a atividade do Al, dos cátions e dos ânions, por meio da especiação química, na solução de alguns solos ácidos brasileiros (AC, PE, RS e SC) submetidos à calagem e cultivados com plantas de soja e milho. Além disso, identificar os elementos químicos responsáveis pela redução da atividade do Al na solução e sua toxidez às plantas. As espécies químicas de alumínio, cálcio, magnésio, potássio, sulfato, cloreto e nitrato predominantes em maiores proporções em todos os solos foram: Al 3+ , Ca 2+ e Mg 2+ , K + , SO 4 2-, Cle NO 3 -. Nos tratamentos sem calcário nos solos AC9, RS e CB predominou a espécie de P H 2 PO 4 e nos solos PE e BR foi a AlHPO 4 + . Porém, com a calagem a forma de P que predominou em todos os solos foi a H 2 PO 4 e, em menor proporção, a HPO 4 2-. A atividade dos íons Ca 2+ e Mg 2+ foi a principal responsável pela neutralização dos efeitos tóxicos do Al 3+ nas plantas avaliadas. Palavras-chave: ânions; calcário dolomítico; cátions; complexos; plantas Composition, chemical speciation and activity of ions in the solution of Brazilian acid soils Rev. Bras. Cienc. Agrar., Recife, v.13, n.3, e5542, 2018 2/10

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Section: Relationship Between Cations and Anions Activity With Aluminmentioning

confidence: 99%

Composition, chemical speciation and activity of ions in the solution of Brazilian acid soils

Cunha

Almeida

Ernani

et al. 2018

Agraria

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“…Nevertheless, the technology of N fertilization rates based on site-specific needs is the focus of considerable ongoing research. It has logical appeal and is of commercial interest despite the recognized optimization requirements (Fontes, 2014). Site-specific plant N needs and real-time N management align well with precision agriculture, relying on identification of plant N requirements.…”

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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“…It is worth mentioning that in soils with a high level of natural fertility, such as AC9 and RS, in which Al 3+ exerted little or no toxicity to the plants, one must consider the amount of nutrients required by the plants as well as the amount of nutrients available in the soil. Insofar as this availability is greater than the amount needed by plants, there is no need to apply the nutrient to the soil, since the addition will not increase the plants productivity (Fontes, 2014;Lacerda et al, 2015).…”

Section: Dmentioning

confidence: 99%

Production of soybean and maize plants cultivated in acid soils with high contents of exchangeable aluminum

Cunha

Almeida

Ernani

et al. 2019

Agraria

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In several Brazilian acid soils, the extractable aluminum with the solution of 1.0 mol L-1 KCl (Al-KCl) may exceed 10 cmol c kg-1 , but in some soils the presence of this element seems to exert little or no interference in the productivity of the plants. The study aimed to evaluate in which conditions the high levels of Al-KCl are related to the toxicity in soybean and maize plants cultivated in greenhouse, and their possible interference in the dry matter production of the same. Also, it aimed at assessing the soil chemical attributes that best identified a probable Al toxicity and the responses of the cultivated plants to liming. Al-KCl is not related to the manifestation of toxicity by the plants, nor did it interfere in the productivity of the plants cultivated in the AC9 and RS soils. On the other hand, the high levels of Al-KCl interfered in the productivity of these plants cultivated in the PE, BR and CB soils, manly in the treatments without limestone. Aluminum saturation, sum and base saturation were the best soil chemical attributes for the identification of Al toxicity and plant response to liming.

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Nutrição mineral de hortaliças: horizontes e desafios para um agrônomo

Abstract: Mineral nutrition of vegetable crops: horizons and challenges for an agronomist

Cited by 7 publications

References 27 publications

Composition, chemical speciation and activity of ions in the solution of Brazilian acid soils

Composition, chemical speciation and activity of ions in the solution of Brazilian acid soils

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

Production of soybean and maize plants cultivated in acid soils with high contents of exchangeable aluminum

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