Mobilidade de potássio em solos decorrente da adição de doses de cloreto de potássio

Neves, Lisiane Silva das; Ernani, Paulo Roberto; Simonete, Marcia Aparecida

doi:10.1590/s0100-06832009000100003

Cited by 33 publications

(27 citation statements)

References 18 publications

(17 reference statements)

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“…The changes in potassium (K) concentrations in soil and percolated profiles, as observed in the present study, were influenced by the variations in the existing concentrations of SSW and DPW, 12.6 and 16.3 mg L -1 respectively (Table 2), according to Neves et al (2009) and Rosolem & Calonego (2013) also vary according to soil type, texture, cation exchange capacity (CEC) and nutrient source solubility. Mielniczuk (2005) points out that although the presence of high soil moisture provides nutrient movement conditions in the profile, the plants and soil CEC present an important role in reducing losses of K in percolates, especially in soils that have or are supplied of organic matter and under crops with high extraction potential, such as Tifton-grass 85 (Fia et al, 2014).…”

Section: Resultssupporting

confidence: 61%

Percolate Quality in Soil Cultivated With Application of Wastewater From Swine Slaughterhouse and Dairy Products

et al. 2017

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ABSTRACT:The objective of this study was to evaluate the quality of the percolate in soil columns cultivated with Tiffon-grass 85 under different wastewater rates from swine slaughterhouse and dairy. The experiment was conducted at the Department of Engineering at the Federal University of Lavras, in PVC columns with 0.30 m of diameter and 1.2 m deep, filled with Dark Red Latosol cultivated with Tifton-grass 85. The treatments consisted of a (AQT0) control with recommended chemical fertilization for Tifton-grass 85 (300 kg ha -1 year -1 of N), and four doses of SSW and DPW (100, 200, 300 and 400% of the recommendation) in a CRD with 3 replications. The samples of percolated were collected and characterized weekly. The treatments of highest dosage have obtained COD, after 120 days, of 47.7 mg L -1 (AAT3) and 38.6 mg L -1 (AAT4). Although nitrate concentrations were elevated on the earlier months, the greater assimilation of nutrients by the Tifton-grass 85 and the reduction of the mineralization of organic material resulted in lower nitrate concentrations of 10 mg L -1 .

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Section: Resultssupporting

confidence: 61%

Percolate Quality in Soil Cultivated With Application of Wastewater From Swine Slaughterhouse and Dairy Products

et al. 2017

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“…The movement of K in the soil profile depends mainly on soil texture (Neves et al, 2009), cation exchange capacity (CEC), water regime and on the dose and solubility of the fertilizer (Rosolem et al, 2006). Therefore, a better management of the nutrients that are essential to the plants is necessary to promote sustainable agriculture (Goulding et al, 2008).…”

Section: Introductionmentioning

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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“…A disponibilidade de K para as plantas depende muito de sua difusão no solo (Prado, 2008;Neves et al, 2009) uma vez que a quantidade que chega às raízes por fluxo de massa é muito menor que a taxa de absorção. O efeito positivo do K sobre o número de vagens deve estar condicionado às várias funções que este cátion exerce no metabolismo vegetal, sendo ativador Figura 2.…”

Section: Methodsunclassified

Adubação potássica aplicada por fertirrigação e pelo método convencional na cultura do amendoim

Sousa

Azevedo

Oliveira

et al. 2013

Rev. bras. eng. agríc. ambient.

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RESUMOCom este trabalho objetivou-se avaliar doses de potássio aplicadas via fertirrigação por gotejamento e de forma convencional sobre a produtividade do amendoim. O experimento foi conduzido em campo, em Argissolo Vermelho Amarelo, em Fortaleza, Ceará. O delineamento experimental utilizado foi o de blocos ao acaso em esquema fatorial com tratamento adicional [(3 x 2) + 1] e quatro repetições, sendo estudados os fatores doses de K (D1 -25, D2 -50 e D3 -100 kg ha -1 ) e duas formas de aplicação (F1 -Fertirrigada e F2 -Convencional) e um tratamento adicional (controle). Aos 90 dias após a semeadura foi realizada a colheita retirando-se, ao acaso, 5 plantas úteis da linha central de cada tratamento, em cada bloco. As plantas foram separadas por tratamento e acondicionadas em estufa telada por cinco dias para a secagem das vagens. As variáveis avaliadas foram: número de frutos por planta, massa de vagem, produtividade, massa de 100 sementes e tamanho de vargem. A dose de potássio aplicada de forma fertirrigada, que maximizou a produtividade (1.530,68 kg ha Potassium fertilization applied by fertigation and conventionally in peanut crop ABSTRACT The objective of this study was to evaluate the influence of potassium doses on peanut yield, when applied by drip fertigation or conventionally. The experiment was conducted in the field, in an Alfissol in Fortaleza, Ceará. The experimental design consisted of randomized blocks in a factorial arrangement plus one additional treatment [(3 x 2) + 1] and four replications, being studied three K doses (D1 -25, D2 -50 and D3 -100 kg ha -1 ) and two application methods (F1 -Fertigation, F2 -Conventional fertilizer application), plus one additional treatment (control). At 90 days after sowing, harvesting was performed, with 5 plants being taken at random from the central line of each treatment, in each block. These plants were separated by treatment and placed in a screened greenhouse for five days, for the pods to dry. The evaluated variables were: number of fruits per plant, pod weight, yield, 100 seed weight and pod size. The fertigated potassium dose corresponding to the maximum peanut crop yield (1530.68 kg ha -1 ) was estimated at 69.39 kg ha -1 of K 2 O. As to the conventionally applied potassium dose that maximized yield was estimated at 65.80 kg ha

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Mobilidade de potássio em solos decorrente da adição de doses de cloreto de potássio

Cited by 33 publications

References 18 publications

Percolate Quality in Soil Cultivated With Application of Wastewater From Swine Slaughterhouse and Dairy Products

Percolate Quality in Soil Cultivated With Application of Wastewater From Swine Slaughterhouse and Dairy Products

Potassium leaching in different soils as a function of irrigation depths

Adubação potássica aplicada por fertirrigação e pelo método convencional na cultura do amendoim

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