Mobilidade vertical de cátions influenciada pelo método de aplicação de cloreto de potássio em solos com carga variável

Ernani, Paulo Roberto; Bayer, Cimélio; Almeida, Jaime Antônio de; Cassol, Paulo Cézar

doi:10.1590/s0100-06832007000200022

Cited by 54 publications

(46 citation statements)

References 19 publications

(19 reference statements)

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“…Since K has only valence charge (K + ), it is little adsorbed by soil colloids (Ernani et al, 2007). In order to obtain a better cost/benefit relationship, it is important the correct management of irrigation and fertilization.…”

Section: Time (T)mentioning

confidence: 99%

Potassium leaching in different soils as a function of irrigation depths

Mendes

Júnior

Cunha

et al. 2016

Rev. bras. eng. agríc. ambient.

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A B S T R A C TPotassium (K) can be easily lost by the leaching process. The objective of this study was to quantify K leaching in clayey and sandy soils under increasing irrigation depths. The experiment was conducted in 2014, in a protected environment, after extraction of undisturbed soil columns, with diameter of 144 mm and height of 300 mm. The columns were arranged in a randomized complete block in a factorial design with three replicates, corresponding to eight treatments: two soil types and four water depths, equivalent to 50, 100, 150 and 200% of the amount of water necessary to bring the soil moisture to field capacity. Potassium chloride, with 58% of K 2 O, was used as K source. Water replacement in the columns was performed every three days, for a period of 81 days. After conducting joint analysis of the data according to the factor Time, a second-degree response surface model was fitted and line charts were also used to study the factors Time and Water. After the evaluations, it was found that the higher the applied water depth, the greater the percolated amount of the K + ion. Lixiviação de potássio em diferentes solos em função de lâminas de irrigação R E S U M ONeste trabalho o objetivo foi quantificar a lixiviação de K em solos argiloso e arenoso sob lâminas crescentes de irrigação. O experimento foi conduzido em 2014, em ambiente protegido, após extração de colunas de solo indeformadas, com diâmetro de 144 mm e altura de 300 mm. As colunas foram arranjadas em um delineamento em blocos completos casualizados em esquema fatorial, com três repetições, constituindo oito tratamentos, sendo dois tipos de solo e quatro lâminas de água equivalentes a 50, 100, 150 e 200% da lâmina de água necessária para levar o solo à umidade na capacidade de campo. Como fonte de K utilizou-se o cloreto de potássio com 58% de K 2 O. A reposição da água nas colunas foi realizada a cada três dias, por um período de 81 dias. Após a realização de análise conjunta dos dados de acordo com o fator Tempo, foram ajustados um modelo de superfície de resposta de segundo grau completo e os gráficos de linhas para estudo dos fatores Tempo e Água. Após avaliações concluiu-se que quanto maior a lâmina de água aplicada maior também a quantidade percolada do íon K + .

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Section: Time (T)mentioning

confidence: 99%

Potassium leaching in different soils as a function of irrigation depths

Mendes

Júnior

Cunha

et al. 2016

Rev. bras. eng. agríc. ambient.

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“…33, nº 2 p. 363 -371, 2011 of K 2 O doses on the physiological quality of soybean seeds and observed higher germination and better results in the tetrazolium test for rates equal to and higher than 80 kg ha -1 . Although K is beneficial for the production of high quality seeds, the excessive fertilization may intensify losses due to ion leaching, even in soils with high exchangeable cation capacity (Ernani et al, 2007), such as the Oxisol in this experiment. There were no residual effects of K sources on wheat seed quality (Table 3) and doses did not affect seed vigor, probably because there was no application of any fertilizers directly on this crop.…”

Section: Resultsmentioning

confidence: 97%

“…Wheat can also benefit from potassium fertilization when soil K levels are low (Chapman and Mason, 1969;Fixen et al, 1986;Sweeney et al, 2000;Singh and Sharma, 2001). Haeder and Beringer (1981), Sweeney et al (2000) and Sharma et al (2005) found that K increased the kernel weight, which may affect seed vigor (Carvalho and Nakagawa, 2000).…”

Section: Introductionmentioning

confidence: 99%

Physiological quality of soybean and wheat seeds produced with alternative potassium sources

Toledo

Castro

Crusciol

et al. 2011

Rev. bras. sementes

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-The use of unconventional sources of K for plants has been widely studied, but the effects of alternative materials on physiological seed quality are still relatively unknown. The objective of this study was to evaluate the physiological quality of soybean and wheat seeds after using different potassium sources in a crop succession. The experimental design was a completely randomized block with four replications. Treatments consisted of three K sources (KCl, alkaline rock and ground phonolite, with 58%, 11% and 8.42% of K 2 O, respectively) applied in four doses (0, 25, 50 and 100 kg K 2 O ha -1 ). Potassium doses were applied in soybean and their residual effects were evaluated on the following wheat crop. Soybean and wheat seeds were evaluated immediately after harvesting by tests for moisture content, seed weight, germination, first count, electrical conductivity, seedling length and seedling dry matter. Soybean plants fertilized with alternative sources of K produced heavier seeds with a lower coat permeability compared to KCl; the physiological quality of soybean seeds and the weight of wheat seeds increase due to higher K 2 O doses, independently of their source.Index terms: Glycine max, Triticum aestivum, germination, potassic rock, residual effects, plant nutrition. QUALIDADE FISIOLÓGICA DE SEMENTES DE SOJA E TRIGO PRODUZIDAS COM FONTES ALTERNATIVAS DE POTÁSSIORESUMO -O uso de fontes não convencionais para fornecimento de K às plantas tem sido amplamente estudado, mas os efeitos de materiais alternativos na qualidade fisiológica das sementes não são conhecidos. Este estudo teve como objetivo avaliar a qualidade fisiológica de sementes de soja e trigo em função da aplicação fontes de potássio em uma sucessão de culturas. O delineamento experimental foi o de blocos ao acaso com quatro repetições. Os tratamentos constaram de três fontes de K (KCl, rocha alcalina e fonolito moído, com 58%, 11% e 8.42%NOTA cIENTÍFIcA 364 M. Z. TOLEDO et al.

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“…Prado et al (2004) also noted that K (rates up to 220 mg dm -3 ) is important for the increase in the leaf area in passion fruit (Passiflora edulis) seedlings. These responses occurred mainly because, among the innumerable functions of K in the plant, the activation of enzymes that participate in photosynthesis and respiration, processes that participate in the metabolism of the leaf, are emphasized (Ernani et al, 2007).…”

Section: Resultsmentioning

confidence: 99%

“…These forms maintain a specific equilibrium with the soil solution and define the K availability to the plants (Ernani et al, 2007). Under specific conditions, the exhaustion of K at the root surface produces a concentration gradient that causes the release of non-exchangeable K (Hinsinger et al, 1993), which can then be uptaken by the plants.…”

Section: Introductionmentioning

confidence: 99%

Initial physic nut nutrition and potassium balance in the soil-plant system

Freiberger

Guerrini

Castoldi

et al. 2014

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe objectives of this study were to evaluate the mineral nutrition and the response of physic nut to potassium fertilization as well as to assess whether the species can absorb K from the non-exchangeable soil fraction. The study was conducted in a greenhouse, in randomized blocks, and with four repetitions. Physic nut plants were cultivated in plastic recipients filled with 50 dm 3 of a Dark Red Latosol fertilized with rates of 0, 40, 80, 120 and 160 mg K dm -3 of soil. One hundred and fifty days after planting, the height, stem diameter and leaf area of the plants were measured, and the dry mass, concentration in leaf and total accumulation of macro and micronutrients were determined, as well as the soil contents of exchangeable and non-exchangeable K. The K balance in the soil-plant system was also calculated. The increase of potassium fertilization resulted in a greater uptake of K, Ca and Mn but did not alter the total dry mass production of physic nut. The species can release and absorb K from the non-exchangeable soil fraction.Nutrição inicial do pinhão-manso e balanço de potássio no sistema solo-planta R E S U M O Objetivou-se, neste trabalho, avaliar a nutrição mineral e a resposta do pinhão-manso à adubação potássica, bem como se a espécie pode absorver K da fração não-trocável do solo. O estudo foi conduzido em estufa plástica, em blocos casualizados com quatro repetições. Plantas de pinhão-manso foram cultivadas em vasos plásticos preenchidos com 50 dm 3 de um Latossolo Vermelho Escuro testando-se as doses de 0, 40, 80, 120 e 160 mg K dm -3 do solo; após 150 dias do plantio foram mensurados altura, diâmetro de colo e área foliar das plantas e se determinou massa seca, teores foliares e acúmulo total de macro e micronutrientes, além dos teores de K trocável e K não-trocável do solo. O balanço do K no sistema solo-planta também foi calculado. O aumento da adubação potássica resulta em maior absorção de K, Ca e Mn mas não altera a produção de massa seca total do pinhão-manso. A espécie é capaz de disponibilizar e absorver K da fração não-trocável do solo. Key words:Jatropha curcas dynamic of nutrient uptake non-exchangeable K Palavras-chave: Jatropha curcas dinâmica de absorção K não-trocável Revista Brasileira de Engenharia Agrícola e Ambiental

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Mobilidade vertical de cátions influenciada pelo método de aplicação de cloreto de potássio em solos com carga variável

Cited by 54 publications

References 19 publications

Potassium leaching in different soils as a function of irrigation depths

Potassium leaching in different soils as a function of irrigation depths

Physiological quality of soybean and wheat seeds produced with alternative potassium sources

Initial physic nut nutrition and potassium balance in the soil-plant system

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