Potássio nas frações texturais de um Latossolo

Chiba, Márcio Koiti; Natale, William; Cruz, Mara Cristina Pessôa da; Teixeira, Luiz Antônio Junqueira; Centurion, José Frederico

doi:10.4025/actasciagron.v30i4.5321

Cited by 6 publications

(8 citation statements)

References 3 publications

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“…Há uma possibilidade da presença das raízes nas camadas mais profundas do solo, com o aumento idade, favorecer a mineralização do potássio não-trocável no solo, uma vez que Chiba et al (2008), apesar de não terem trabalhado com a cultura do eucalitpto, verificaram que a quantidade de potássio exportada em bananeiras da variedade Nanicão (Musa AAA subgrupo Cavendish) foi maior do que a variação dos teores trocáveis em Latossolo Vermelho eutroférrico típico, indicando que formas não-trocáveis estariam sendo aproveitadas pelas plantas.…”

Section: Resultsunclassified

Fertilização potássica na implantação de Corymbia citriodora (Hook.) K.D. Hill & L.A.S. Jonhson

Biagiotti¹,

Valeri²,

Cruz³

et al. 2017

Sci. For.

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ResumoA fertilização potássica pode gerar incrementos no crescimento das árvores e maximizar a produtividade florestal. O objetivo desse trabalho foi verificar os efeitos da aplicação de doses de potássio no crescimento e na produção de biomassa de madeira de plantas de Corymbia citriodora. Foram aplicadas doses de 0, 30, 60, 90, 120 e 150 kg ha -1 de K 2 O na forma de cloreto de potássio em Argissolo Vermelho Amarelo textura arenosa. As doses de potássio foram parceladas, em quantidades iguais no plantio, aos 6 e 9 meses. As mudas foram plantadas no espaçamento de 3 x 2 m e o delineamento experimental foi de blocos ao acaso com seis tratamentos e quatro repetições. Foram feitas avaliações de altura e de diâmetro do caule aos 6, 9, 12 e 24 meses após plantio. Também aos 12 meses, foi determinada a densidade básica da madeira, estimado o volume de madeira e a produção de biomassa de madeira por hectare. Até aos 12 meses de idade, o crescimento e a produção de biomassa de C. citriodora foram favorecidos com a fertilização potássica, sendo que a aplicação de 62 kg ha -1 de K 2 O promoveu maior crescimento em diâmetro e a de 85 kg ha -1 de K 2 O promoveu maior produção de biomassa de madeira. Aos 24 meses de idade, não houve resposta à adubação potássica, sugerindo maior exigência do nutriente na fase inicial de crescimento. Palavras-chave: eucalipto, nutrição florestal, argissolo. AbstractPotassium fertilization can generate increases in tree growth and maximize forest productivity. The aim of this study was to verify the effects of application of potassium doses on the growth and wood biomass production of Corymbia citriodora. Doses of 0, 30, 60, 90, 120 and 150 kg ha -1 K 2 O were applied in Ultisol, sandy texture. The potassium doses were split in equal amounts at planting, at 6 and 9 months. Seedlings were planted at 3 x 2 m spacing and the experimental design was a randomized block design with six treatments and four replications. Evaluations were made in height and stem diameter at 06, 09, 12 and 24 months after planting. Also, at 12 months, the basic density of wood, the wood volume per hectare, and wood biomass production per hectare were determined. Until age 12 months, growth and biomass production of C. citriodora increased by potassium fertilization; the application of de 62 kg ha -1 de K 2 O promoted greatest growth in diameter and 85 kg ha -1 de K 2 O promoted greatest production of wood biomass. At 24 months there was no response to potassium fertilization, suggesting greater demand of the nutrient at the early stages of growth.

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Section: Resultsunclassified

Fertilização potássica na implantação de Corymbia citriodora (Hook.) K.D. Hill & L.A.S. Jonhson

Biagiotti¹,

Valeri²,

Cruz³

et al. 2017

Sci. For.

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“…This increase in the non-exchangeable K concentration may be because the frequent application of K fertilizers results in changes in soil K minerals (BORTOLUZZI et al, 2005). In a clay soil of the Jaboticabal, São Paulo, Chiba et al (2008) found that the application of 900 kg ha -1 yr -1 of K 2 O increased the non-exchangeable K concentration of 40%. In a study conducted for 11 years in an Arenic Hapludult of Santa Maria (RS), Bortoluzzi et al (2005) found increased of non-exchangeable K with the addition of K, reflecting in the increased of micaceous minerals (i.e., illite and illite-smectite interstratified clay), compared to the soil without K fertilization.…”

Section: Soil Potassium Poolsmentioning

confidence: 99%

Potassium supplying capacity of some lowland soils under potassium fertilization and successive croppings

et al. 2020

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The effects of intense cropping and potassium fertilization on potassium (K) dynamics and non-exchangeable K release from three lowland soils of Paraná State, Brazil, were investigated in this study. Samples of three lowland soils were fertilized or not with K and subjected to six successive croppings (soybeans, pearl millet, wheat, common beans, soybeans, and maize). The crops were grown in 8-L pots for 45 days, and at the end of the sixth cropping, the soil from each pot was sampled to the determination of soil K pools. The lowland soils differ in the ability to K supply to the plants in the short to medium term due to the wide range of origin material and the concentration of K in solution, exchangeable K, non-exchangeable K, and structural K. When the soils were not fertilized with K, the successive cropping resulted in continuous depletion process of non-exchangeable and exchangeable K; however, this depletion was less pronounced in soils with a higher potential buffer capacity of K. Non-exchangeable and exchangeable K concentrations were increased with the addition of K fertilizer, indicating the occurrence of K fixation in soil. The non-exchangeable K contribution to K nutrition of plants ranged from 44 to 69% in the treatments without the addition of K fertilizer, reporting the importance of non-exchangeable K pools in the supply of this nutrient to plants in agricultural production systems.

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“…Available K at both depths and after the first and second sugarcane harvests is considered low and very low (as classified by Raij, 2011) for the KCl treatment, respectively, while they are considered adequate for TK47, thereby demonstrating the residual effect of the Thermopotash. According to Chiba, Natale, Cruz, Teixeira, and Centurion (2008), the amount of K absorbed by the plants was often greater than the variation of exchangeable K content, suggesting that non ex changeable forms are being taken up.…”

Section: -----------------------------------Mg (Cmol C Dm -3 ) ------mentioning

confidence: 99%

<b>Sugarcane cultivation with source potassium low water-soluble

et al. 2018

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ABSTRACT. Thermopotash is a fertilizer with low solubility but has a release level compatible with plant demands. This study aimed to compare the effect of Thermopotash to that of KCl in sugarcane. Field work was conducted during two crop seasons, in a randomised block design. Treatments were applied to the bases of the furrows before planting the sugarcane, arranged in a 2 x 5 factorial design to evaluate two K sources (TK47 -Thermopotash, KCl -potassium chloride) at five levels of K (0, 50, 100, 150, and 200 kg ha -1 K 2 O). The variables analysed included leaf and soil K, Ca, Mg and Si, soil pH and productivity. The effects of the TK47 fertilizer on sugarcane stalk production were not initially superior to that of the soluble source, but over time, differences between the soluble and insoluble sources increased. The maximum expected sugarcane productivity for both sources was 133 Mg ha -1 , which was achieved at an application level of 121 kg ha -1 K 2 O. TK47 fertilizer provided K, Si, Ca and Mg to the sugarcane in both the first and second harvests. Thus, TK47 may be a viable source of K for sugarcane.Keywords: thermopotash; potassium chloride; soil; Saccharum spp.Cultivo da cana-de-açúcar com fonte de potássio pouco solúvel em água RESUMO. Termopotássio é um fertilizante com baixa solubilidade em água mas possui uma taxa de liberação compatível com a demanda da planta. Esse estudo objetivou avaliar os efeitos do termopotássio em relação ao cloreto de potássio no cultivo da cana. O trabalho foi realizado no campo durante duas safras agrícolas, em delineamento de blocos casualizados. Os tratamentos foram aplicados no sulco antes do plantio da cana, organizados em esquema fatorial 2x5, sendo duas fontes K (TK47-Termopotássio e KClcloreto de potássio) e cinco doses de K (0, 50, 100, 150 e 200 kg ha -1 de K 2 O). As variáveis analisadas foram: teores de K, Ca, Mg e Si nas folhas e solo, pH do solo e produtividade. Os efeitos do adubo TK47 sobre a produção foram similares aos da fonte solúvel na cana planta, e ao longo do tempo, as diferenças entre fontes solúveis e insolúveis aumentaram. A produtividade máxima esperada da cana planta para ambas as fontes foi de 133 Mg ha -1 , com a aplicação de 121 kg ha -1 de K 2 O. O adubo TK47 forneceu K, Si, Ca e Mg para a cana planta e para a cana soca. Assim, o TK47 pode ser uma fonte viável de K para a cana-de-açúcar.Palavras-chave: termopotássio; cloreto de potássio; solo; Saccharum spp.

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Potássio nas frações texturais de um Latossolo

Cited by 6 publications

References 3 publications

Fertilização potássica na implantação de Corymbia citriodora (Hook.) K.D. Hill & L.A.S. Jonhson

Fertilização potássica na implantação de Corymbia citriodora (Hook.) K.D. Hill & L.A.S. Jonhson

Potassium supplying capacity of some lowland soils under potassium fertilization and successive croppings

<b>Sugarcane cultivation with source potassium low water-soluble

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