Poaceae cespitosa e decumbente adubadas com NPK: efeitos na agregação do solo

Almeida, Dácio Jerônimo de; Silva, Ivandro de França da; Silveira, Flávio Pereira da Mota; Santiago, R.; Costa, José Ronaldo Calado da

doi:10.1590/s1983-40632014000100002

Cited by 4 publications

(5 citation statements)

References 10 publications

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“…Aggregate stability index (ASI) values shown in table 5 were higher than those verified by Almeida et al (2014), in a work done on the same experimental area, where it was evaluated the effect of fertilization on caespitosa and decumbens Poaceae over soil aggregation. They found ASI values of 0.790 in 2010 for the Brachiaria brizantha treatment.…”

Section: Discussionmentioning

confidence: 74%

“…According to Köppen classification, the predominant climate in the municipality is As'-tropical, hot and humid, with rains during autumn and winter and mean annual precipitation of 1400 mm (Almeida et al, 2014), with 62.0% occuring between April and July. The annual mean temperature is 24.5 ºC (75.2 °F) and the relative humidity of the air ranges in average of RH = 80.0% (Carmo et al, 2012).…”

Section: Characterization Of the Experimental Areamentioning

confidence: 99%

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Physical Quality Indicators of an Oxisol Under Grass in the Agreste Region of Paraiba, Brazil

Silva¹,

Oliveira²,

Nóbrega³

et al. 2019

JAS

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The aim of this study was to evaluate the influence of different grass cultivars on physical attributes of an Oxisol in the Agreste region of Paraíba. The experiment was set up in 2005 in experimental areas of the Center of Agricultural Sciences of the Federal University of Paraíba, Areia-PB. The experimental design adopted was that of randomized complete blocks (RCB) with 5 treatments and 4 replications, in experimental plots of 50 m 2 . The treatments were the following: I. Brachiaria decumbens Stapf., II. Brachiaria brizantha, III. Brachiaria humidicola (Rendle) Schweickvr., IV. Brachiaria brizantha cv. MG5-Vitória and V. Brachiaria ruziziensis. In October 2018 samples of soil with disturbed and undisturbed structure were collected at the center of each experimental plot in the depth of 0.0-0.10 m for the determination of the following variables: soil porosity (total, macro and micro), bulk density, compaction degree, saturated hydraulic conductivity, field capacity, permanent wilting point, available water content, soil aeration capacity, clay dispersed in water, flocculation degree and aggregate stability index. The analysis of variance was performed and the means were compared by Tukey's tests, principal component analysis and Pearson's correlation analysis (p < 0.05). It is concluded that after the 13-year period, Brachiaria brizantha promoted improvements to the field capacity of the Oxisol. The other attributes were not physically altered. Main component analysis showed that the correlation values were more significant for the Brachiaria brizantha component. Pearson's correlation was significant between field capacity and soil aeration capacity.

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Section: Discussionmentioning

confidence: 74%

Section: Characterization Of the Experimental Areamentioning

confidence: 99%

Physical Quality Indicators of an Oxisol Under Grass in the Agreste Region of Paraiba, Brazil

Silva¹,

Oliveira²,

Nóbrega³

et al. 2019

JAS

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“…Consequently, the AD micro‐aggregates increased from 6 to 28%, depending on moisture conditions. Low proportion of clays dispersed in water show greater aggregate stability in areas with grasses (de Almeida et al, 2014). Argissoil typically presents low clay dispersed in water (Bronick and Lal, 2005).…”

Section: Resultsmentioning

confidence: 99%

“…Several factors are related to stability of aggregates in soil. Iron and aluminum oxides, fine roots, fungal hyphae, bacterial cells, clay and carbonate content, enzymatic activity, liming management, C and N availability, and the effect of SOM play important roles in this process (Silva and Mielniczuk, 1998; Bronick and Lal, 2005; Abiven et al, 2009; de Almeida et al, 2014; Cui and Holden, 2015).…”

Section: Resultsmentioning

confidence: 99%

Soil and Root Attributes in Pastures Managed under Different Stocking Rates and Nitrogen Fertilization Levels

Silva

Dubeux

Silveira

et al. 2019

Agrosystems Geosci & Env

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Core Ideas Grassland is a widespread agroecosystem in the globe; however, not enough attention has been given to link grazing management to soil health. Grazing management practices greatly impact soil quality. Moderate stocking rate are more adequate to keep grassland stability. Pasture management affects soil physical–chemical properties and root depth distribution. Adjusting grazing pressure and N fertilization are key management tools affecting these responses. This study evaluated the effect of N fertilization and stocking rate (SR) on soil physical and chemical attributes and root depth distribution in grazed elephantgrass (Pennisetum purpureum Schum. cv. 381) pastures (2009 and 2010). Treatments consisted of three SR (2.0, 3.9, and 5.8 AU ha−1; 1 AU = animal unit = 450 kg body weight) and three N doses (0, 150, and 300 kg N ha−1 yr−1) on elephantgrass pastures. Response variables included soil bulk density (BD), particle density (PD), total porosity (TP), aggregate stability (AS), water infiltration rate (WIR), light fraction of soil organic matter (LF‐SOM), soil fertility, root length density (RLD), and root biomass. Increased SR resulted in greater BD. Soil bulk density ranged from 1.42 to 1.58 g cm−3 for SR ranging from 2.0 to 5.8 AU ha−1, respectively. The C concentration of the LF‐SOM decreased with increasing SR, ranging from 383 to 174 mg C kg−1 soil. Soil fertility, RLD, and the stock of C and N in the root system varied among soil layers. At the end of 2 yr, SR and N fertilization did not affect TP, WIR, and AS nor influenced soil fertility and root system distribution. Overgrazing led to soil compaction and reduced LF‐SOM, indicating a trend of pasture degradation. Moderate SR resulted in greater LF‐SOM, indicating a positive trend for C accumulation in the long term.

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“…O município está inserido na microrregião do Brejo e mesorregião do Agreste da Paraíba (6°58'12''S; 35°41'15''W). Conforme a classificação de Köppen, o clima que predomina no município é do tipo As'tropical, quente e úmido, com chuvas no período de outono e inverno e precipitação média anual de 1.400 mm (ALMEIDA et al, 2014). Apresenta altitude média de 620 m.…”

Section: Methodsunclassified

Estoques De Carbono E Retenção Hídrica Em Biomassa De Gramíneas No Agreste Da Paraíba

Silva

Oliveira

Pereira

et al. 2019

Revista Brasileira De Engenharia De Biossistemas

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RESUMO O sistema de manejo, quando adotado de forma incorreta pode ocasionar à degradação física, química e biológica do solo, principalmente na ausência de cobertura vegetal. A escolha da gramínea é parte fundamental nos sitemas de produção, principalmente quanto a produção de matéria seca e a deposição de carbono ao solo, favorecendo a recuperação de ambientes degradados. Sendo assim, objetivou-se com este trabalho avaliar o estoque de carbono e a retenção hídrica em biomassa de gramíneas cultivadas no agreste da Paraíba. O experimento foi instalado em área experimental do Centro de Ciências Agrárias da Universidade Federal da Paraíba, Areia (PB) (6°58'12''S; 35°41'15''W). O delineamento foi de blocos casualisados composto pelos seguintes tratamentos T1-Brachiaria decumbens Stapf., T2-Brachiaria brizantha, T3-Brachiaria humidicola (Rendle) Schweick vr., T4-Brachiaria brizantha cv. MG5-Vitória e T5-Sem cobertura vegetal. As variáveis analisadas foram: carbono orgânico total, estoque de carbono, produção de matéria seca e reteção hídrica na matéria seca. De acordo com os resultados, a Brachiaria brizantha foi superior na produção de matéria seca e na capacidade de retenção hídrica. O carbono orgânico total e o estoque de carbono não variaram entre os tratamentos avaliados. Palavras-chave: Brachiaria brizantha, cobertura do solo, retenção hídrica, matéria orgânica.

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Poaceae cespitosa e decumbente adubadas com NPK: efeitos na agregação do solo

Cited by 4 publications

References 10 publications

Physical Quality Indicators of an Oxisol Under Grass in the Agreste Region of Paraiba, Brazil

Physical Quality Indicators of an Oxisol Under Grass in the Agreste Region of Paraiba, Brazil

Soil and Root Attributes in Pastures Managed under Different Stocking Rates and Nitrogen Fertilization Levels

Estoques De Carbono E Retenção Hídrica Em Biomassa De Gramíneas No Agreste Da Paraíba

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