Produtividade de um solo litólico associada ao controle da erosão por cordões de pedra em contorno

Silva, F.J. da; Silva, J.R.C.

doi:10.1590/s0100-06831997000300012

Cited by 6 publications

(4 citation statements)

References 1 publication

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“…In general, regardless of the evaluated layer, in PAST environments (29.90 g kg -1 ) the lowest mean SOM levels were found. Although several studies (Silva & Mielniczuk, 1997;Costa et al, 2000;El-Husny, 2010) show that pasture areas, especially with Brachiaria brizantha Cerri, 2008) tends to stock C in the soil, due to the great part of the root system of the grasses to be concentrated in the first meters of the soil (approximately 0.4 m), which guarantees an SOM greater contribution, in this study this behavior was not observed. Thus, one must consider the quality of the organic material deposited particularities in the soil, such as lignin contents and C/N ratio (Coleman et al, 1989).…”

Section: Soil Organic Matter (Som) and Total-ncontrasting

confidence: 61%

Inorganic Nitrogen Fractions in Soil Under Different Uses and Management Systems in the Brazilian Eastern Amazon

Torres

Pinheiro

Hungria

et al. 2020

JAS

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Land use and management systems are factors that control availability and nitrogen (N) forms in soil environment. The aim was to evaluate the inorganic N fractions dynamics in soil under different use and management systems in Brazilian Eastern Amazon conditions. Soils were sampled at depths of 0.0-0.1 and 0.1-0.2 m in areas under pasture (PAST), no-tillage (NT), conventional tillage (CT) and a reference area under fallow vegetation (FV). In the samples, soil organic matter (SOM), total-N, ammonium (N-NH4+) and nitrate (N-NO3-) contents were determined and the urease enzyme activity was measured. In CT and NT the SOM contents were similar to those found in FV, with an average of 36.7 g kg-1, while under PAST there was a 16.6% reduction when compared to the reference area. The total-N levels followed the same dynamics found for SOM. The ammonium concentration was 2.4 times higher in soils under FV (14 mg kg-1) when compared to other systems and nitrate followed the order NT> CT> FV=PAST. The pasture (44 µg N-NH4+ g-1 soil h-1), among soils for agricultural use, induced the highest ureolytic activity. The preserved soil conversion from native forest to pasture caused a 16.6% reduction in the SOM contents and 55.5% and 46% for ammonium and nitrate, respectively. On the other hand, the NT system has the capacity to accumulate SOM in a similar way to the area of native vegetation studied, as well as a high capacity to retain N in the soil, preferentially in the nitrate form.

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Section: Soil Organic Matter (Som) and Total-ncontrasting

confidence: 61%

Inorganic Nitrogen Fractions in Soil Under Different Uses and Management Systems in the Brazilian Eastern Amazon

Torres

Pinheiro

Hungria

et al. 2020

JAS

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“…The determination of the mean weighted diameter of wet aggregates (Wet MWD) and mean weighted diameter of dry aggregates (Dry MWD) were performed according to methodology proposed by Kemper & Chepil (1965), with variations proposed by Carpenedo & Mielniczuk (1990) and Silva & Mielniczuk (1997), where the principle is to evaluate the resistance offered by the aggregates when submitted to oscillations in both wet and dry sieves. The aggregate stability index (ASI) was calculated through the Wet/Dry MWD ratio.…”

Section: Journal Of Agricultural Studiesmentioning

confidence: 99%

The Influence of Oxisol Physics Parameters on Dry Matter Production in Grasses of Brachiaria Genus

Silva

Oliveira

Pereira

et al. 2020

JAS

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The aim of this study was to assess the correlation between physical attributes of a Yellow Oxisol and the shoot dry matter production in grasses from the Brachiaria genus in the Brejo region, in Paraíba. The experiment has been conducted since 2005 in an experimental area of the Center of Agricultural Sciences of the Federal University of Paraíba, Areia-PB (6°58’12’’ S; 35°41’15’’ W and 573 m altitude). The experimental design adopted was that of randomized complete blocks (RCB) with 4 treatments and 4 replications. T1- Brachiaria decumbens Stapf.; T2- Brachiaria brizantha (Hochst) Stapf.; T3- Brachiaria humidicola (Rendle) Schwnickerdt Vr.; T4- Brachiaria brizantha MG5 cv. Vitória. The soil in the experimental area was characterized as Dystrophic Yellow Oxisol with clay-sandy texture. Soil samples with disturbed and undisturbed structure were collected within the 0.0-0.10 m layer. The shoot dry matter of grasses was collected in october of 2018. The analyzed variables were: bulk density (BD), compaction degree (CD), total porosity (TP), macroporosity (Ma), microporosity (Mi), field capacity (θFC), permanent wilting point (θPWP), available water content (θAWC), soil aeration capacity (SAC), mean weighted diameter of wet and dry aggregates (Wet and Dry MWD), aggregate stability index (ASI) and saturated hydraulic conductivity (Kθ). The Student’s t-test and Pearson's correlation analysis (p <0.05) were performed. It was concluded that dry matter production was positively influenced by θFC and θPWP. And the increase of the average values of BD, CD, Wet and Dry MWD favored the increase of shoot dry matter production by grasses.

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“…The determination of the weighted meansdiameter of soil wet aggregates (WMDwa) and weighted meansdiameter of soil dry aggregates (WMDwa) followed the methodology proposed by Kemper and Chepil (1965), with changes proposed by Carpenedo and Mielniczuk (1990) and Silva and Mielniczuk (1997), where the principle is to evaluate the resistance that the aggregates offer when submitted to oscillations in sieves in water. The aggregate stability index (ASI) was estimated by the ratio between the WMDwa/WMDda.…”

Section: Physicmentioning

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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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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Produtividade de um solo litólico associada ao controle da erosão por cordões de pedra em contorno

Cited by 6 publications

References 1 publication

Inorganic Nitrogen Fractions in Soil Under Different Uses and Management Systems in the Brazilian Eastern Amazon

Inorganic Nitrogen Fractions in Soil Under Different Uses and Management Systems in the Brazilian Eastern Amazon

The Influence of Oxisol Physics Parameters on Dry Matter Production in Grasses of Brachiaria Genus

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

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