Umidade do solo e doses de potássio na cultura da soja

Serafim, Milson Evaldo; Ono, Fábio Benedito; Zeviani, Walmes Marques; Novelino, José Oscar; Silva, Joil Vilhalva

doi:10.1590/s1806-66902012000200003

Cited by 20 publications

(20 citation statements)

References 11 publications

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“…All doses provided a greater seed weight if compared to control, especially the 90 kg ha -1 K 2 O dose. These data differ from those experienced by Gonçalves et al (2010), however, corroborate those obtained by Serafim et al (2012). It is possible to observe that the equation describing the behavior of the variable thousand seeds weight to K application follows the same trend of the equations that describe the accumulation of biomass and index of grain harvest (IGH), since the last one expresses the crop efficiency of converting biomass into grain productivity.…”

Section: Resultssupporting

confidence: 79%

“…The number of grains per pod is influenced by a genetic characteristic of this cultivar and by the nutritional status of the plant, thus explaining the lack of effect of K doses in this study, since the levels of K in soil were found within the range considered as high for the Savannah region. The effect of the absence of K application could, probably, manifest at low availability in the soil, being able in a K deficiency situation, to cause an increase in the number of empty lobes, as verified (Serafim et al, 2012).…”

Section: Resultsmentioning

confidence: 66%

“…An increase in K content in soybean was also verified by Serafim et al (2012) with the application of increasing doses of potassium chloride. Already the internal efficiency in the use of nutrient-potassium (IENU-K) showed a quadratic behavior ( Figure 3B).…”

Section: Resultsmentioning

confidence: 75%

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Productivity and Yield Components of Soybeans under Dose and Potassium Application Period in Piaui Savannah

Petter¹,

Silva²,

Neto³

et al. 2012

JAS

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The objective of this study was to evaluate the efficiency of rates and application periods of K on soybeans in the Savannah in Piauí. The work was carried out in a dystrophic oxisol. The experimental design was randomized blocks with four replications in a factorial design, the treatments consisted of combinations of five potassium doses 30, 60, 90, 120 and 150 kg ha -1 (K 2 O) + witness (0 kg ha -1 ), applied at four different times: 100% at soybean sowing, 50% at sowing and 50% at 30 days after sowing (DAS), 100% at 30 DAS, 50% at 20 DAS and 50% to 40 DAS. Evaluated the following variables: height soybean plants, dry biomass, internal efficiency in the use of nutrient-K (IENU-K), number of pods per plant -1 , number of grains per pod -1 , a thousand seeds weight, grain harvest index and productivity. There was no effect concerning the period of application of K in the variables analyzed. Exceptions done for dry biomass and the number of pods per plant -1 , the other variables were significantly influenced by K rates. All variables significantly influenced by the application of K rates showed quadratic response, in which, exception of IENU-K, the curves showed the highest values by applying 83 to 93 kg ha -1 K 2 O.

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Section: Resultssupporting

confidence: 79%

Section: Resultsmentioning

confidence: 66%

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Productivity and Yield Components of Soybeans under Dose and Potassium Application Period in Piaui Savannah

Petter¹,

Silva²,

Neto³

et al. 2012

JAS

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“…, resultando em maior produtividade. O mesmo fato foi verificado por Petter et al (2012) e Serafim et al (2012), que, testando adubação potássica na soja, obtiveram respostas positivas para a massa de grãos e rendimento de grãos em função da utilização de K.…”

Section: Resultsunclassified

Potássio em cobertura no milho e efeito residual na soja em sucessão

Parente

Lazarini

Caioni

et al. 2016

AGRO@MBIENTE ON-LINE

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Resumo: O potássio (K) é o segundo nutriente mais extraído pela maioria das culturas agrícolas, podendo influenciar na frutificação, peso de grãos e em outros processos fisiológicos. No entanto, ainda há questionamentos quanto ao seu possível efeito residual em áreas de plantio direto. Assim, objetivou-se com esse trabalho avaliar a eficiência imediata do K no milho, segunda safra, e o possível efeito residual na cultura da soja cultivada em sucessão no sistema plantio direto. O delineamento experimental foi em blocos casualizados com nove doses de K 2 O em cobertura (0, 15, 30, 45, 60, 75, 90, 120 e 150 kg ha -1 na forma de KCl), aplicadas no estádio vegetativo V6 no milho, com quatro repetições. O estudo foi desenvolvido em área de Cerrado. Foram avaliados os caracteres morfológicos e produtivos nas duas culturas. Houve aumento na produtividade de milho até a dose de máxima eficiência técnica de 89 kg ha -1 de K 2 O e na soja até 80 kg ha -1 , além do aumento no número de vagens por planta e na massa de mil grãos. Os resultados evidenciam, assim, o efeito residual do K no cultivo da soja em sucessão. Palavras-chave: Adubação potássica. Doses. Glycine max. Zea mays.Abstract: Potassium (K) is the second most-extracted nutrient by the majority of agricultural crops, and can influence fruiting, grain weight and other physiological processes. However, there are still questions regarding possible residual effects in areas of direct seeding. The aim of this study therefore, was to evaluate the immediate effects of K on second-crop maize, and the possible residual effect on soybean crops grown in succession under a no-tillage system. The experimental design was of randomised blocks with nine doses of K 2 O as topdressing (0, 15, 30, 45, 60, 75, 90, 120 and 150 kg ha -1 ), in the form of KCl applied in the V6 vegetative growth stage of the maize, with four replications. The study was carried out in an area of Cerrado, with soybean grown in succession. Morphological and production characteristics were evaluated in the two crops. There was an increase in maize productivity up to the dose of maximum technical efficiency, 89 kg ha -1 K 2 O, and in the soybean, up to 80 kg ha -1 , in addition to the increase in the number of pods per plant and thousand grain weight. The results therefore, demonstrate the residual effect of K in soybean crops grown in succession.

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“…Serafim et al (2012) observaram aumento no rendimento e no peso específico das sementes, em resposta à adubação com esse nutriente.…”

Section: Methodsunclassified

Adubação com fósforo e potássio para produção e qualidade de sementes de soja

Filho

Ferreira

Vieira

et al. 2013

Pesq. agropec. bras.

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Resumo -O objetivo deste trabalho foi avaliar os efeitos da adubação com fósforo e potássio na produção e na qualidade de sementes de soja. Foram realizados experimentos em dois anos agrícolas, em delineamento de blocos ao acaso, em arranjo fatorial 5x3, com cinco doses de fósforo (0, 40, 80, 120 e 160 kg ha -1 de P 2 O 5 como superfosfato triplo), três de potássio (0, 50 e 100 kg ha -1 de K 2 O como cloreto de potássio) e quatro repetições. Foram avaliados: produtividade, número de sementes por planta, número de vagens por planta, peso de mil sementes, germinação, vigor (envelhecimento acelerado, condutividade elétrica e lixiviação de potássio), e teores de P e K na folha e na semente. A produtividade, o peso de mil sementes e a produção de vagens e de grãos por planta aumentaram linearmente com a adubação fosfatada. O aumento na produtividade foi de 17,6%, no primeiro ano, e de 39,7% no segundo. As doses de P, no entanto, não interferiram na germinação e no vigor das sementes. A adubação potássica não altera a produtividade nem a concentração de K nas sementes, mas pode melhorar a germinação, sem interferir no vigor.Termos para indexação: Glycine max, adubação fosfatada, adubação potássica, germinação, nutrição mineral, vigor. Phosphorus and potassium fertilization for yield and quality of soybean seedsAbstract -The objective of this work was to evaluate the effects of phosphorus and potassium fertilization on the yield and quality of soybean seeds. Experiments were carried out in two growing seasons, in a randomized complete block design, in a 5x3 factorial arrangement with five levels of phosphorus (0, 40, 80, 120, and 160 kg ha -1 P 2 O 5 as triple superphosphate), three of potassium (0, 50, and 100 kg ha -1 K 2 O as potassium chloride), and four replicates. The following were evaluated: yield, number of seeds per plant, number of pods per plant, weight of a thousand seeds, germination, vigor (accelerated ageing, electrical conductivity, and potassium leaching), and P and K contents in leaf and seed. Yield, weight of a thousand seeds, and pod and seed yield per plant increased linearly with P fertilization. The increase in yield was 17.6% in the first year and 39.7% in the second. However, P levels did not affect seed germination and vigor. Potassium fertilization do not influence yield or K concentration in the seeds, but may improve germination, without interfering in vigor.

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Umidade do solo e doses de potássio na cultura da soja

Cited by 20 publications

References 11 publications

Productivity and Yield Components of Soybeans under Dose and Potassium Application Period in Piaui Savannah

Productivity and Yield Components of Soybeans under Dose and Potassium Application Period in Piaui Savannah

Potássio em cobertura no milho e efeito residual na soja em sucessão

Adubação com fósforo e potássio para produção e qualidade de sementes de soja

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