Calibração de métodos de extração de potássio em solos cultivados sob sistema plantio direto

Schlindwein, Jairo André; Bortolon, Leandro; Gianello, Clésio

doi:10.1590/s0100-06832011000500021

Cited by 5 publications

(5 citation statements)

References 8 publications

(7 reference statements)

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“…a 5,6 PVda 1998-1999 1998-1999 RB (4) P 0 90 UFSM (São Francisco de Assis) 5,6 RQ soil sampling, experimental design, and crop types. More details on the experiments can be found in [6] and in [8]. The soil samples from each plot contained a minimum of four subsamples and soils were sampled using a shovel from layers 0 -10 and 0 -20 cm deep over an area 10/5 cm wide/thick.…”

Section: Methodsmentioning

confidence: 99%

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Phosphorus and potassium fertilization in no till southern Brazilian soils

Schlindwein¹,

Bortolon²,

Fioreli-Pereira³

et al. 2013

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Phosphorus (P) and potassium (K) levels in southern Brazilian (Rio Grande do Sul, RS) soils are largely below the critical concentrations more than four decades after implementation of the officially recommended system. This study aims to evaluate the increase in P and K levels in 0-10 and 0-20 cm deep samples from no-till soils using the Mehlich-1 (M1) and Mehlich-3 (M3) extractants as well as resin methods and to estimate the amount of P 2 O 5 and K 2 O fertilizers necessary to increase the P and K soil levels by 1 mg•kg −1. The study was conducted in fields cultivated using a no-till system (direct planting) to grow soybeans, wheat, maize, pasture, and cover crops and fertilized with P 2 O 5 and K 2 O. Soil samples were collected from the 0-10 and 0-20 cm soil layers and analyzed by the M1, M3, and resin methods. The results demonstrated that the P and K levels increased in the 0-10 and 0-20 cm layers. However, the amount of these levels increased depending on the source of phosphate fertilization and on the P and K extraction methods used. The amount of P 2 O 5 fertilization needed to raise the P level by 1 mg•kg −1 was greater in the 0-20 cm layer than in the 0-10 cm layer, and the amount of K 2 O fertilization needed to raise the K level by 1 mg•kg −1 was higher in the 0-10 cm layer than in the 0-20 cm layer.

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Section: Methodsmentioning

confidence: 99%

“…These yields are partially due to low soil fertility [2][3][4][5]. However, when the supply of nutrients and other production factors are sufficient during the crop growth cycle, these yields are higher, reaching up to 3000, 3000, and 10,000 kg•ha −1 for soybeans, wheat, and maize, respectively [6][7][8].…”

Section: Introductionmentioning

confidence: 99%

Phosphorus and potassium fertilization in no till southern Brazilian soils

Schlindwein¹,

Bortolon²,

Fioreli-Pereira³

et al. 2013

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“…A equação utilizada para o ajuste dos dados foi a equação de Mitscherlich (Equação 2), que é uma equação exponencial forçada a alcançar o rendimento relativo de 100 % e que tem sido amplamente utilizada em estudos de calibração (Cubilla et al, 2007;Villalba, 2008;Wendling et al, 2008;Schlindwein et al, 2011):…”

Section: Amostragem Do Solo E Avaliações Realizadasunclassified

Adubação Fosfatada para Alta Produtividade de Soja, Milho e Cereais de Inverno Cultivados em Rotação em Latossolos em Plantio Direto no Centro-Sul do Paraná

Vieira

Fontoura

Bayer

et al. 2015

Rev. Bras. Ciênc. Solo

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reSUmOO estado do paraná não dispõe de um sistema de recomendação de adubação para rotação de culturas em plantio direto (pD). em razão disso, utiliza indicações geradas para culturas individuais há mais de 30 anos e em preparo convencional. este estudo teve como objetivo consolidar a calibração de p e avaliar a resposta das culturas à adubação fosfatada, visando à proposição de um sistema de indicações técnicas para a adubação fosfatada das culturas da soja, do milho, do trigo e da cevada cultivadas em sistema de rotação em latossolos com longo histórico de pD (>30 anos) na região centro-sul do paraná, que se caracteriza por possuir alto potencial produtivo. três experimentos de calibração foram conduzidos de 2008 a 2013 e consistiram na criação de níveis de p pela aplicação de doses a lanço de até 640 kg ha -1 de p 2 O 5 . Quarenta e quatro experimentos de resposta a p foram conduzidos entre as safras de 2011 a 2012/13, tendo como foco avaliar a resposta das culturas a p em solos com distinta disponibilidade do nutriente. Os rendimentos relativos [rr = (rendimento sem p/rendimento máximo) × 100] das culturas e os teores de p no solo (mehlich-1) foram relacionados, obtendo-se os teores críticos e as classes de disponibilidade de p no solo. para a estimativa das doses nas classes de disponibilidade baixa e Média, foram utilizadas as curvas de resposta à adubação de P, seguindo a filosofia de suficiência Recebido para publicação em 29 de julho de 2014 e aprovado em 12 de janeiro de 2015.

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“…Data were fitted by using the Mitscherlich equation, an exponential expression used to reach a relative yield of 100 %, which is widely used for calibration (Cubilla et al, 2007;Villalba, 2008;Wendling et al, 2008;Schlindwein et al, 2011):…”

Section: Fitting Calibration Curves and Determination Of Critical Soimentioning

confidence: 99%

“…It increases K accumulation in the surface layer (0.00-0.05 m) (Silveira et al, 2000;Almeida et al, 2005;Pauletti et al, 2009), which may influence K supply to crops and result in differences in K availability between soil layers (Schlindwein et al, 2011). The cation exchange capacity (CEC) of NT soils also increases in a stratum-dependent manner through an increase in organic C content (Bayer and Mielniczuk, 1997).…”

Section: Introductionmentioning

confidence: 99%

Potassium Fertilization for Long Term No-Till Crop Rotation in the Central-Southern Region of Paraná, Brazil

Vieira

Fontoura

Bayer

et al. 2016

Rev. Bras. Ciênc. Solo

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Fertilization programs for annual crops in the state of Paraná, southern Brazil, are based on studies that focused on conventional tillage and were established more than 30 years ago. The primary purpose of this study was to assess potassium (K) fertilization on long-term (>30 years) no-tillage soybean, corn, wheat, and barley crops grown in rotation on Oxisols in the central-southern region of Paraná. A total of 47 experiments were carried out from 2008 to 2013, three of which addressed K calibration and the other 44, crop response to K fertilization. Critical K soil-test value and interpretation classes were established from the ratio between relative crop yield [RY = (yield without K/max yield) × 100] and soil K levels. Winter cereals were found to be more demanding of K than were soybean and corn; also, the former governed critical K soil-test value for crop rotation: 0.23 cmol c dm -3 in the 0.00-0.20 m soil layer. Recommended fertilization rates for soils in the low and medium soil K levels were established by using the build-up approach for soil correction; and those for the high and very high soil K levels were established by removing K at harvest and assessing economic return in crop response experiments. The K rates calculated for the high yield classes exceeded those currently recommended for use in Paraná.

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Calibração de métodos de extração de potássio em solos cultivados sob sistema plantio direto

Cited by 5 publications

References 8 publications

Phosphorus and potassium fertilization in no till southern Brazilian soils

Phosphorus and potassium fertilization in no till southern Brazilian soils

Adubação Fosfatada para Alta Produtividade de Soja, Milho e Cereais de Inverno Cultivados em Rotação em Latossolos em Plantio Direto no Centro-Sul do Paraná

Potassium Fertilization for Long Term No-Till Crop Rotation in the Central-Southern Region of Paraná, Brazil

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