Biomassa microbiana do solo em sistema de plantio direto na região de Campos Gerais - Tibagi, PR

Filho, Solismar de Paiva Venzke; Feigl, Brigitte Josefine; Píccolo, Marisa de Cássia; Neto, Marcos Siqueira; Cerri, Carlos Clemente

doi:10.1590/s0100-06832008000200015

Cited by 16 publications

(10 citation statements)

References 41 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Since in Brazil and other South American countries NT is used uninterruptedly, there is no periodic soil tillage, the accumulation of crop residues in the topsoil and the addition of lime and fertilizers to the surface intensifies soil stratification over time, leading to the accumulation of organic C and N (Ebeling et al, 2008;Venzke Filho et al, 2008), as well as P, K + , Ca 2+ and Mg 2+ to depths of 0.0-0.10 m (Klein et al, 2007;Spera et al, 2011;Acqua et al, 2013;Kramer et al, 2014). Since the vertical mobility of lime is reduced in NT, the subsurface soil changes to a more acidic environment with higher concentrations of exchangeable aluminum (Al 3+ ) (Raij et al, 1998;Ernani et al, 2001), creating a chemical limitation to root growth.…”

Section: Introductionmentioning

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

View full text Add to dashboard Cite

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.

show abstract

Section: Introductionmentioning

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

View full text Add to dashboard Cite

show abstract

“…O teor de matéria orgânica no solo, a qualidade e a quantidade de resíduos agrícolas adicionados e somados às práticas de manejo, são fatores que influenciam na concentração e na atividade da microbiota do solo (Gama-Rodrigues et al, 2005;Venzke Filho et al, 2008). Porém a atividade microbiana pode ser limitada pela escassez de nutrientes encontrados no solo embora a adição de resíduos contendo C ou N possa aumentar a biomassa desses micro-organismos, conforme Graham et al (2002).…”

Section: Introductionunclassified

Atividade microbiana em solos, influenciada por resíduos de algodão e torta de mamona

Capuani

Rigon

Beltrão

et al. 2012

Rev. bras. eng. agríc. ambient.

View full text Add to dashboard Cite

R ESU M OA atividade microbiana não se constitui apenas como bom indicador da qualidade do solo, mas é influenciada pela adição de carbono no sistema, o qual serve como substrato aos micro-organismos que aumentam sua atividade e a liberação de CO 2 , compreendendo a respiração edáfica do solo. Objetivouse, neste trabalho, avaliar a atividade microbiana em diferentes tipos de solo com a adição de torta de mamona e resíduo têxtil de algodão. O trabalho foi conduzido em casa de vegetação na sede da Embrapa Algodão, em delineamento de blocos casualisados em esquema fatorial 4 x 3, com quatro repetições. A intervalos predeterminados de 4 dias os recipientes foram abertos e a solução de NaOH foi titulada com HCl 2 N na presença de indicador ácido/base fenolftaleína. Após a leitura a mesma quantidade de NaOH foi reposta e os recipientes novamente fechados. A diferença entre a quantidade de ácido necessária para neutralizar o hidróxido de sódio no recipiente testemunha e nos tratamentos equivale à quantidade de gás carbônico produzido pelos micro-organismos do solo. Constatou-se que os resíduos influenciaram significativamente a atividade microbiana nos diferentes tipos de solo, sobretudo nas primeiras determinações, apresentando-se como boas fontes para mineralização e fornecimento de nutrientes, tendo a torta de mamona proporcionado maior liberação acumulada de CO 2 pelos microorganismos.Palavras-chave: respiração edáfica, coprodutos, fertilização orgânica Microbial activity in soils influenced by residues of cotton and castor bean presscake A B ST R A C T Microbial activity constitutes a good indicator of soil quality, and is influenced by the addition of carbon in the system serving as a substrate for microorganisms that increase their activity and release of CO 2 , comprising the edaphic respiration of the soil. The objective of this study was to evaluate the microbial activity in different soil types with the addition of cake press of castor bean and cotton textile residue. The study was conducted in a greenhouse at the headquarters of Embrapa Cotton in randomized block design in 4 x 3 factorial arrangement with four replications. At predetermined intervals of 4 days, the containers were opened and the solution of NaOH titrated with HCl 2N in the presence of acid/base indicator phenolphthalein. After reading, the same amount of NaOH was added and the containers were closed again. The difference between the amounts of acid needed to neutralize the sodium hydroxide in a control container and the treatments was equivalent to the amount of carbon dioxide produced by soil microorganisms. It was found that the residues influenced the microbial activity in different soil types, especially in the initial determinations, presenting themselves as good sources for mineralization and nutrient supply, the castor bean proportionating higher cumulative release of CO 2 by microorganisms.

show abstract

“…A biomassa microbiana e sua atividade têm sido apontadas como as características mais sensí-veis às alterações na qualidade do solo, causadas por mudanças de uso e por práticas de manejo. Estudos elaborados por Venzke Filho et al (2008) mostraram que a quantidade e a composição da biomassa microbiana podem ser influenciadas por diversos fatores, entre eles o sistema de cultivo, a rotação de cultura e a textura do solo.…”

Section: Introductionunclassified

Biomassa microbiana e matéria orgânica em solo de Caatinga, cultivado com melão na Chapada do Apodi, Ceará

Lopes¹,

Medeiros²,

Silva³

et al. 2012

Rev. Ceres

View full text Add to dashboard Cite

Microbial biomass and organic matter in soil of Caatinga, cultivated with melon in Chapada do Apodi, Ceará StateThe intensive use of the conventional system over the years of soil preparation may change the soil microbial attributes, causing a reduction of biomass and microbial activity. As so, the present study aimed to analyze, under melon (Cucumis melo L.) cultivation, the microbiological changes as well as soil organic matter content in the depth of 0-0.10, 0.10-0.20, 0.20-0.30 and 0.30-0.40 O uso contínuo, ao longo dos anos, do sistema convencional de preparo do solo pode alterar os atributos microbiológicos do solo, causando a redução da biomassa e da atividade microbiana. Diante do exposto, o objetivo deste trabalho foi avaliar, sob cultivo do melão (Cucumis melo L.), as alterações microbiológicas do solo, assim como as do teor de matéria orgânica, nas profundidades de 0 a 0,10, 0,10 a 0,20, 0,20 a 0,30 e 0,30 a 0,40 m, ao longo dos anos sob cultivo do melão, durante três, cinco e dez anos, em Cambissolo Háplico eutrófico, a fim de compará-los com os do solo da mata natural (Caatinga). As amostras foram coletadas, aleatoriamente, na Fazenda Melão Doçura, localizada no município de Quixeré, Ceará, e encaminhadas para o Laboratório de Análise de Solos, Água e Planta da UFERSA, Mossoró, Rio Grande do Norte. Determinaram-se os teores de matéria orgânica (MO), o de carbono da biomassa microbiana (CBM) e o quociente microbiano (qMIC). O delineamento experimental foi o inteiramente casualizado (DIC), disposto em esquema fatorial 4 x 4 (Fator I, anos de cultivo; Fator II, causa de variação na profundidade), com três repetições. Os resultados mostraram que a matéria orgânica aumentou a partir dos cinco anos de cultivo do melão. O carbono da biomassa microbiana foi elevado nas camadas superficiais, independentemente do tempo de cultivo, por causa da maior disponibilidade da matéria orgânica, água e nutrientes, e o quociente microbiano diminuiu com o tempo, apresentando menor concentração no cultivo de dez anos do melão, discriminando as possíveis alterações decorrentes do uso agrícola do solo.Palavras-chave: carbono microbiano, manejo do solo, carbono orgânico.

show abstract

Biomassa microbiana do solo em sistema de plantio direto na região de Campos Gerais - Tibagi, PR

Abstract: RESUMO

Cited by 16 publications

References 41 publications

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

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

Atividade microbiana em solos, influenciada por resíduos de algodão e torta de mamona

Biomassa microbiana e matéria orgânica em solo de Caatinga, cultivado com melão na Chapada do Apodi, Ceará

Contact Info

Product

Resources

About