Retenção e dessorção competitivas de ânions inorgânicos em gibbsita natural de solo

Pozza, Adélia Aziz Alexandre; Curi, Nilton; Costa, Enio Tarso de Souza; Guilherme, Luiz Roberto Guimarães; Marques, João José; Motta, P. E. F. da

doi:10.1590/s0100-204x2007001100015

Cited by 27 publications

(20 citation statements)

References 16 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…In the West region, in turn, although the higher clay and silt content could have offered more surface sites for chemical adsorption of cations and anions (Pozza et al, 2007), and thus minimize the dependence of N fertilization on soil C dynamics, our findings did not show higher N-fertilizer recovery ( Figure 5). For this region, the higher N availability reduced the positive effects on soil C due to maintenance of harvest residues (Figure 1).…”

Section: Discussionmentioning

confidence: 51%

Contribution of Eucalyptus Harvest Residues and Nitrogen Fertilization to Carbon Stabilization in Ultisols of Southern Bahia

Oliveira

Silva

Ferreira

et al. 2018

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

Eucalyptus forests in southern Bahia (BA) are planted in soils with a sandy surface layer and humid tropical climate, conditions that lead to soil carbon (C) decomposition. Recent studies have shown that nitrogen (N) may be important for soil C stabilization. The aim of this study was to evaluate the contribution of Eucalyptus harvest residues and nitrogen fertilization to C stabilization in Ultisols of southern BA. The experiment was conducted in Eucalyptus clonal plantations cultivated in two regions of Eunápolis, BA, Brazil, with different clay content: southern region (140 g kg -1 of clay) and western region (310 g kg -1 of clay). Five treatments were evaluated: one control (CTR), without Eucalyptus harvest residues and N fertilization, and four treatments with harvest residues combined with four rates of N fertilization: 0, 25, 50, and 100 kg ha N) of particulate organic matter (POM) and mineral-associated organic matter (MAOM) were determined. In the southern region after 36 months, the C-MAOM stocks in the 0.00-0.10 m layer of the CTR decreased by 33 %. The addition of harvest residue followed by 100 kg ha -1 N increased C-POM and N-POM stocks (0.00-0.10 m) compared to the CTR, and the final N-POM stocks and residue-C recovery in the surface soil layer were positively correlated with the increase in N fertilization rates. In the western region, residue maintenance resulted in increased C-MAOM stocks (0.00-0.10 m) compared to the CTR, but an increase in N availability reduced this increment. The increase in N fertilization rates did not alter C stocks, but reduced N stocks of POM and MAOM in the upper soil layer. At the end of the experiment, N fertilizer recovery (0.00-0.60 m) was similar among the regions evaluated. In soil with lower clay content, higher N availability led to higher C and N stocks in the particulate fraction. In soils with high clay content, physical and chemical protections are more important than N fertilization for soil C stabilization, and just maintaining harvest residues may suffice to increase C and N in the more stable SOM fraction.

show abstract

Section: Discussionmentioning

confidence: 51%

Contribution of Eucalyptus Harvest Residues and Nitrogen Fertilization to Carbon Stabilization in Ultisols of Southern Bahia

Oliveira

Silva

Ferreira

et al. 2018

Rev. Bras. Ciênc. Solo

View full text Add to dashboard Cite

show abstract

“…The explanation for this is that most of the catchment area is under pasture (Figure 2D), managed without fertilizer addition, in soils that are naturally poor in P ( Figure 5A), and with high capacity to adsorb P (mainly the PVA and CX - Figure 2C). Several authors highlight the low availability of P in tropical soils, as well as the high adsorption capacity of Fe and Al oxides (Fink et al, 2014;Pozza et al, 2007;Ribeiro et al, 2011).…”

Section: P Index For Current Land Usementioning

confidence: 99%

Phosphorus transfer at a small catchment in southeastern Brazil: distributed modelling in different land use scenarios

et al. 2017

Self Cite

View full text Add to dashboard Cite

Identifying and ranking nutrient loss risk areas are important steps towards integrated catchment management. This study aimed to apply the P index model at the Posses catchment, south of the state of Minas Gerais, Brazil. We applied the P index for the current land use at the Posses catchment and for two hypothetical scenarios: scenario 1, in which P fertilizer was applied to all land uses, except for native forests; and scenario 2, which considered the use of P fertilizer as in scenario 1, and that the Environmental Protection Areas referring to the riparian forests and springs were totally restored. Considering current land use, almost the whole catchment area (91.4%) displayed a low P loss risk. The highest P index was associated to croplands and eucalyptus plantations. Regarding scenario 1, areas under pasture fell into the low (15.1%), medium (45.5%), high (27.1%) and very high (12.3%) P index categories. Environmental Protection Areas on scenario 2 decreased the P loss risk from the scenario 1 in 37.6%. Hence, the model outputs indicate that the reforestation of buffer zones can decrease P loss risk in the case increasing use of P fertilizer. The P index model is a potential support tool to promote judicious use of fertilizers and conservation practices at the Posses catchment.Index terms: P index; nutrient loss; water erosion; land use management; environmental services. RESUMOIdentificar e classificar áreas quanto ao risco de perda de nutrientes são passos importantes para o manejo integrado de bacia hidrográfica. O objetivo deste estudo foi aplicar o modelo Índice P na bacia hidrográfica das Posses, Extrema-MG. O Índice P foi empregado sobre as condições atuais de uso da terra na bacia hidrográfica das Posses e na simulação de dois cenários: cenário 1, o fertilizante P foi aplicado para todos os usos, exceto para florestas nativas e, cenário 2, além do fertilizante P ser aplicado da mesma forma que no cenário 1, considerou-se que as Áreas de Proteção Ambiental referentes as matas ciliares e nascentes fossem totalmente restituídas. Considerando o uso atual, quase toda a bacia hidrográfica (91,4%) apresentou baixo risco de perda de P. O maior Índice de P foi associado a lavouras e plantações de eucalipto. No cenário 1, as pastagem apresentaram Índice P baixo (15,1%), médio (45,5%), alto (27,1%) e muito alto (12,3%). No cenário 2, as Áreas de Proteção Ambiental promoveram uma redução de 37,6% no risco de perda de P do cenário 1. Dessa forma, os resultados do modelo indicam que o reflorestamento de matas ciliares pode reduzir o risco de perdas de P no caso do aumento do uso de fertilizantes. O Índice P é uma potencial ferramenta para promoção do uso criterioso de fertilizantes e de práticas conservacionistas na bacia hidrográfica das Posses.Termos para indexação: Índice P; perda de nutrientes; erosão hídrica; gestão do uso da terra; serviços ambientais.

show abstract

“…Além do mais, a adubação do solo de cada unidade experimental foi feita com a aplicação de todos os fertilizantes simultaneamente. Segundo Pozza et al (2008), a prévia aplicação de silicato diminuiu em 40% a adsorção de fosfato aplicado posteriormente, já que o fosfato é o ânion preferencialmente adsorvido. No entanto, os autores relatam que o ânion silicato também foi capaz de deslocar o ânion fosfato previamente adsorvido.…”

Section: Doses De Si P X S (P) (S)unclassified

Desenvolvimento da aveia branca e disponibilidade de fósforo em razão da aplicação de silicato de potássio

et al. 2011

View full text Add to dashboard Cite

White oat development and phosphorus availability affected by potassium silicate applicationPotassium silicate application in soil can increase phosphorus availability and influence white oat growth. This work had the objective of evaluating the effects of silicate doses applied to the soil on the white oat growth and on soil P availability. The experimental design was completely randomized, with six replications, analyzed as a 2 x 4 factorial. Treatments consisted of two P doses (20 and 200 mg dm -3 of P 2 O 5 ) combined with four Si doses (0, 150, 300 and 450 mg dm -3 ), applied at sowing. Dry matter of leaves+stems, panicles and total shoot were evaluated right after harvest. P and Si contents were evaluated in grains and panicle straw, previously separated, as well as in leaves+stems. Concentrations of Si and P in soil after harvest were also determined. Fertilization with potassium silicate increases Si levels in soil and increases P availability. Dry matter of leaves+stems is increased by silicate whenever initial P levels are low. Even considering the highest P dose, silicate application increases P availability in soil, and the plant P uptake. Si contents in panicle straw, leaves+stems and grains are influenced by the higher availability of this element in soil. Desenvolvimento da aveia branca e disponibilidade de fósforo em razão da aplicação de silicato de potássio A aplicação de silicato de potássio pode aumentar a disponibilidade de fósforo no solo, além de influenciar no crescimento da aveia branca. Objetivou-se neste trabalho avaliar o efeito da aplicação de doses de silicato de potássio no solo no desenvolvimento da aveia branca e na disponibilidade de fósforo. O delineamento experimental foi inteiramente ao acaso, em esquema fatorial 2 x 4, com seis repetições. Os tratamentos foram 20 e 200 mg dm -3 de P 2 O 5 combinados com 0, 150, 300 e 450 mg dm -3 de Si, aplicados por ocasião da semeadura. Após a colheita, determinaramse a matéria seca de folhas + colmos, das panículas e o total da parte aérea. A palha das panículas foi separada para avaliação dos teores de P e Si nas folhas + colmos, grãos e palha das panículas. As concentrações de Si e P no solo foram avaliadas após colheita das plantas. A aplicação de silicato aumenta os teores de Si no solo e influencia na maior disponibilidade de fósforo. A matéria seca de folhas + colmos é incrementada pelo silicato quando os teores iniciais de P são baixos. Mesmo com a dose elevada de P, a aplicação de silicato aumenta a disponibilidade de P no solo e a absorção pelas plantas. Os teores de Si na palha das panículas, folhas + colmos e grãos são influenciados pela maior disponibilidade do elemento no solo. Palavras-chave:Avena sativa, silício, fosfato.

show abstract

Retenção e dessorção competitivas de ânions inorgânicos em gibbsita natural de solo

Cited by 27 publications

References 16 publications

Contribution of Eucalyptus Harvest Residues and Nitrogen Fertilization to Carbon Stabilization in Ultisols of Southern Bahia

Contribution of Eucalyptus Harvest Residues and Nitrogen Fertilization to Carbon Stabilization in Ultisols of Southern Bahia

Phosphorus transfer at a small catchment in southeastern Brazil: distributed modelling in different land use scenarios

Desenvolvimento da aveia branca e disponibilidade de fósforo em razão da aplicação de silicato de potássio

Contact Info

Product

Resources

About