Relação cálcio:magnésio do corretivo da acidez do solo na nutrição e no desenvolvimento inicial de plantas de milho em um Cambissolo Húmico Álico

Medeiros, João Carlos; Albuquerque, Jackson Adriano; Mafra, Álvaro Luiz; Rosa, Jaqueline Dalla; Gatiboni, Luciano Colpo

doi:10.5433/1679-0359.2008v29n4p799

Cited by 44 publications

(51 citation statements)

References 4 publications

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“…Outra limitação relacionada ao uso do resíduo alcalino decorre da elevada relação molar entre Ca e Mg (Almeida et al, 2007a). O desbalanço entre esses dois nutrientes no solo pode reduzir o desenvolvimento das culturas, pois a presença de um elemento pode prejudicar a absorção do outro (Orlando Filho et al, 1996;Medeiros et al, 2008). Ademais, em solos com alta relação entre Ca e Mg, verifica-se redução da absorção de K, que ocorre pelo efeito antagônico entre K e Ca em função das altas quantidades de Ca adicionadas, como observado por Pintro et al (2005) Costa et al (2006).…”

Section: Introductionunclassified

Calagem superficial com resíduo alcalino da indústria de papel e celulose em um solo altamente tamponado

Medeiros

Albuquerque

Mafra

et al. 2009

Rev. Bras. Ciênc. Solo

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Section: Introductionunclassified

Calagem superficial com resíduo alcalino da indústria de papel e celulose em um solo altamente tamponado

Medeiros

Albuquerque

Mafra

et al. 2009

Rev. Bras. Ciênc. Solo

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“…ions to the soil solution, which is further transported to deeper soil layers as the water percolates through the profile (Medeiros et al, 2008). The formation of MgSO 0 4, which is mobilized easily in the soil, also occurs (Zambrosi et al, 2007).…”

Section: +mentioning

confidence: 99%

Do Rates and Splitting of Phosphogypsum Applications Influence the Soil and Annual Crops in a No-Tillage System?

Vicensi

Müller

Kawakami

et al. 2016

Rev. Bras. Ciênc. Solo

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ABSTRACT:Applications of phosphogypsum (PG) provide nutrients to the soil and reduce Al 3+ activity, favoring soil fertility and root growth, but allow Mg 2+ mobilization through the soil profile, resulting in variations in the PG rate required to achieve the optimum crop yield. This study evaluated the effect of application rates and splitting of PG on soil fertility of a Typic Hapludox, as well as the influence on annual crops under no-tillage. Using a (4 × 3) + 1 factorial structure, the treatments consisted of four PG rates (3, 6, 9, ) and three split applications (P1 = 100 % in 2009; P2 = 50+50 % in 2009 and 2010; P3 = 33+33+33 % in 2009, 2010 and 2011), plus a control without PG. The soil was sampled six months after the last PG application, in stratified layers to a depth of 0.8 m. Corn, wheat and soybean were sown between November 2011 and December 2012, and leaf samples were collected for analysis when at least 50 % of the plants showed reproductive structures. The application of PG increased Ca 2+ concentrations in all sampled soil layers and the soil pH between 0.2 and 0.8 m, and reduced the concentrations of Al 3+ in all layers and of Mg 2+ to a depth of 0.6 m, without any effect of splitting the applications. The soil Ca/Mg ratio increased linearly to a depth of 0.6 m with the rates and were found to be higher in the 0.0-0.1 m layer of the P2 and P3 treatments than without splitting (P1). Sulfur concentrations increased linearly by application rates to a depth of 0.8 m, decreasing in the order P3>P2>P1 to a depth of 0.4 m and were higher in the treatments P3 and P2 than P1 between 0.4-0.6 m, whereas no differences were observed in the 0.6-0.8 m layer. No effect was recorded for K, P and potential acidity (H+Al). The leaf Ca and S concentration increased, while Mg decreased for all crops treated with PG, and there was no effect of splitting the application. The yield response of corn to PG rates was quadratic, with the maximum technical efficiency achieved at 6.38 Mg ha -1 of PG, while wheat yield increased linearly in a growing season with a drought period. Soybean yield was not affected by the PG rate, and splitting had no effect on the yield of any of the crops. Phosphogypsum improved soil fertility in the profile, however, Mg 2+ migrated downwards, regardless of application splitting. Splitting the PG application induced a higher Ca/Mg ratio in the 0.0-0.1 m layer and less S leaching, but did not affect the crop yield. The application rates had no effect on soybean yield, but were beneficial for corn and, especially, for wheat, which was affected by a drought period during growth.

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“…This highlights the importance of the sampling grids density since soils from Brazilian 'Cerrado' have typically low cation exchange capacity (Sousa & Lobato, 2004). In addition, high calcium and magnesium contents could reduce potassium absorption due to antagonistic effect between K and Ca (Pinto et al, 2005;Medeiros et al, 2008), since high calcium amounts could be added in case of super estimation on lime requirement.…”

Section: Semivariancementioning

confidence: 99%

Sampling grid density and lime recommendation in an Oxisol

Bottega¹,

Queiroz²,

Pinto³

et al. 2014

Rev. bras. eng. agríc. ambient.

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A B S T R A C TThe objective of this study was to evaluate the influence of different sampling grids density in the lime requirements in an Oxisol. The experiment was conducted at a rural property located in Sidrolândia city, Mato Grosso do Sul state, in the Brazilian 'Cerrado' . In the soil attributes mapping, regular sampling grid was used consisting of 99 points, spread over an area of 90 ha. Other two grids (51 and 27 points) were derived by deleting lines or lines and points from the original one. Based on the results of soil analysis, the lime requirement at each sample point was calculated. Using geostatistical techniques the spatial variability of lime requirement was studied and grid configuration for each sample was tested. By kriging, maps were made. By reducing the number of sampling points, 11% of the experimental area showed an overestimation and 8% underestimation comparing with the lime requirement made using the highest sampling grid density.

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Relação cálcio:magnésio do corretivo da acidez do solo na nutrição e no desenvolvimento inicial de plantas de milho em um Cambissolo Húmico Álico

Cited by 44 publications

References 4 publications

Calagem superficial com resíduo alcalino da indústria de papel e celulose em um solo altamente tamponado

Calagem superficial com resíduo alcalino da indústria de papel e celulose em um solo altamente tamponado

Do Rates and Splitting of Phosphogypsum Applications Influence the Soil and Annual Crops in a No-Tillage System?

Sampling grid density and lime recommendation in an Oxisol

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