Disponibilidade de fósforo em solos cultivados com arroz irrigado por alagamento no Rio Grande do Sul

Gonçalves, Gustavo Krüger; Meurer, Egon José

doi:10.1590/s0100-06832008000700018

Cited by 3 publications

(5 citation statements)

References 10 publications

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“…However, the implementation of M3 could increase analytical efficiency in routine laboratory work. As was the case with the present study, Kroth (1998), Gonçalves & Meurer (2008), and Bortolon et al (2009) reported no significant differences between M1 and M3. It should be noted that, whereas this current study used triple superphosphate as the source of P for plants, Kroth (1998), Gonçalves et al (2012), and Oliveira et al (2015) tested natural phosphates.…”

Section: Resultssupporting

confidence: 82%

“…According to most of the literature, M3 extracts more P than M1 (Schlindwein & Gianello, 2008;Bortolon et al, 2009Bortolon et al, , 2011. However, some studies detected either no differences between the methods (Oliveira et al, 2015) or higher P extraction with M1 than M3 (Gonçalves & Meurer, 2008). Although it has often been claimed, the alleged superiority of M3 over M1 is not always shown, as was the case in the present study for soils with clay content > 200 g kg -1…”

Section: Resultscontrasting

confidence: 49%

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Remaining phosphorus content to determine phosphorus availability of the soils in Rio Grande do Sul

Rogeri¹,

Bortolon²,

Gianello

et al. 2017

Pesq. agropec. bras.

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-The objective of this work was to evaluate remaining P compared with soil clay content as a P buffer index to classify P extracted by the Mehlich-1 (M1) and Mehlich-3 (M3) methods in soils from the state of Rio Grande do Sul, Brazil. The experiment was carried out in a completely randomized design with five P 2 O 5 rates (0, 50, 100, 200, and 400 mg kg -1 ) and two sucessive corn crops, and three replicates, in 20 representative soils of the state. P extracted by M1 and M3 before crop planting was adjusted to P contents in biomass, considering soil buffer capacity. The division of soils into different buffering classes, based on soil clay or remaining P, improved the capacity of estimating soil available P of both methods. However, there was no difference among the correlation coefficients obtained by classifying soils according to the evaluated indexes (remaining P or soil clay) for both M1 and M3 methods. Remaining P is a viable alternative to replace soil clay content to classify soil P extracted with the M1 and M3 methods.Index terms: clay content, phosphate buffer capacity, phosphate fertilization, phosphorus adsorption, soil test. Fósforo remanescente para determinar a disponibilidade de fósforo em solos do Rio Grande do SulResumo -O objetivo deste trabalho foi avaliar o P remanescente comparado ao teor de argila como índice tampão para classificar o P extraído pelos métodos de Mehlich-1 (M1) e Mehlich-3 (M3), em solos do Rio Grande do Sul. O experimento foi realizado em delineamento inteiramente casualisado, com cinco doses de P 2 O 5 (0, 50, 100, 200 e 400 mg kg -1 ), dois cultivos sucessivos de milho, e três repetições, em 20 solos representativos do Estado. O P extraído pelos métodos M1 e M3, antes dos cultivos, foi ajustado aos conteúdos de P na biomassa, tendo-se considerado a capacidade tampão do solo. A divisão dos solos em classes de tamponamento, de acordo com o teor de argila ou com o P remanescente, melhorou a capacidade preditiva do P disponível para ambos os métodos. Todavia, não houve diferença entre os coeficientes de correlação obtidos pela classificação dos solos de acordo com os índices avaliados (P remanescente ou teor de argila), tanto para o método M1 como para o M3. A análise do P-rem é uma alternativa viável para substituir o teor de argila na classificação do P extraído pelos métodos M1 e M3.Termos de indexação: teor de argila, fator capacidade de fósforo, adubação fosfatada, adsorção de fósforo, análise de solo.

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Section: Resultssupporting

confidence: 82%

Section: Resultscontrasting

confidence: 49%

Remaining phosphorus content to determine phosphorus availability of the soils in Rio Grande do Sul

Rogeri¹,

Bortolon²,

Gianello

et al. 2017

Pesq. agropec. bras.

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“…In our study citric acid failed to solubilize soil residual P in the high P retention soils affected by weathering of basaltic rocks. Our results are confirmed by other studies conducted in soils derived from basaltic and granitic rocks from Brazil that indicated better correlations between soil P extracted by different soil P methods and P absorbed by rice plants when the two groups of soils were considered separately (Gonçalves and Meurer 2008).…”

Section: Soil and Crop Historysupporting

confidence: 90%

“…Numerous studies around the world have evaluated the different soil P tests for their capacity to estimate soil P availability for flooded rice production (Ekpete 1976;Rojas 1976;Perumal and Velayutham 1977;Chang 1978;Bado et al 2008;da Silva et al 2008;Gonçalves and Meurer 2008). The three major conclusions of these studies were as follows: (i) when P-Fe predominates in flooded soils (generally with pH lower than 5.5), most of the tests gave good correlations with soil P availability; (ii) when the dominant fraction is P-calcium (Ca), alkaline extractants as the Olsen method gave the best correlations with available P; and (iii) when there was not a clear predominance of iron (Fe)-or Ca-P fractions, the Olsen or Bray 1 methods were the most suitable P tests.…”

Section: Introductionmentioning

confidence: 99%

Soil Phosphorus Tests for Flooded Rice Grown in Contrasting Soils and Cropping History

Hernández

Berger

Deambrosi

et al. 2013

Communications in Soil Science and Plant Analysis

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Soil phosphorus (P) tests for flooded rice (Oryza sativa L.) generally present uncertainties for estimating P availability. Bray 1, 1% citric acid, Mehlich 3, Olsen extractants (dry samples), and Bray 1 extractant after 3 days (BI3) and 7 days (BI7) of anaerobic incubations were evaluated to estimate P availability for rice in 43 Uruguayan soils. Field trials were conduced at each site (0, 13, 26, and 39 kg P applied ha −1 ). Relative yield and absolute and relative yield increases were determined. Extracted P was variable for the different tests. For silty soils, P availability was better estimated by citric acid, Mehlich 3, and Bray 1, with similar soil P critical concentrations (6−8 mg P kg −1 ). The BI3 and BI7 tests showed greater soil P critical concentration but poorer correlations with yield indexes. This study contributes to the scientific basis of P fertilization for flooded rice, promoting more effective fertilizer use and minimizing environmental P losses.

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“…On another report evaluating three lowland soils (Typic Albaqualf, Vertic Albaqualf and Typic Endoaqualf), where different TSP and Daoui phosphate rock doses were applied, correlation levels of 0.58 and 0.61 were observed for Mehlich-1 and AER, respectively (Cardoso, 2007). Higher values based on determination coefficients (R 2 = 0.88 for resin and R 2 = 0.83 for Mehlich-1) were also observed (Gonçalves & Meurer, 2008).…”

Section: --------------------------------------P Content In Shoot (G mentioning

confidence: 78%

Phosphorus Availability for Irrigated Rice Cultivated Under No-Tillage and Different Phosphate Sources

Fortes¹,

Sousa²,

Gomes³

et al. 2018

JAS

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The objective of this work was to evaluate the response of irrigated rice to phosphate fertilization using triple superphosphate (TSP) and Arad phosphate rock (APR), and the phosphate residual effects of upland crops in no-tillage system on the following rice crop. Also, it aimed to evaluate the efficiency of Mehlich-1 and anion exchange resin as soil P extractors. Two experiments were conducted in Albaqualf soil under irrigated conditions in the southern region of Rio Grande do Sul State. The experiments were designed as random blocks with four replications and the treatments were displayed as a 2 × 2 factorial (TSP and APR, with and without annual P application as TSP). No yield responses to phosphate were observed. Phosphate fertilization performed on upland crops (maize and soybeans) presented a residual effect on the rice crop even after four years of consecutive cropping under no-tillage. The extractors Mehlich-1 and AER were equally efficient in the evaluation of P availability for the rice crop. P content values obtained by both methods did show a significant correlation with accumulated plant P. The APR presents a similar performance as the TSP in regard to phosphate nutrition in irrigated rice when rotated with upland crops under no-tillage system.

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Disponibilidade de fósforo em solos cultivados com arroz irrigado por alagamento no Rio Grande do Sul

Cited by 3 publications

References 10 publications

Remaining phosphorus content to determine phosphorus availability of the soils in Rio Grande do Sul

Remaining phosphorus content to determine phosphorus availability of the soils in Rio Grande do Sul

Soil Phosphorus Tests for Flooded Rice Grown in Contrasting Soils and Cropping History

Phosphorus Availability for Irrigated Rice Cultivated Under No-Tillage and Different Phosphate Sources

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