Simulador de chuva tipo empuxo com braços movidos hidraulicamente: fabricação e calibração

Kaufmann

et al. 2018

Pesq. agropec. bras.

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The objective of this work was to determine adjustment parameters for the revised universal soil loss equation (Rusle) of a soil subjected to pig slurry application. Treatments consisted of 0, 50, 100, and 200 m3 ha-1 pig slurry (PS), after the cultivation of black oat (Avena strigosa), besides the application of 50 m3 ha-1 PS for six times onto the soil surface in a temporal sequence, and a control treatment of soil without cultivation and without pig slurry application. The evaluations were performed for black oat shoot dry mass, root mass and crop residues semi-incorporated into the soil (RMR), soil losses by means of simulated rain, and the parameters for water erosion modeling. The pig slurry application onto soil surface caused a reduction in the values of the soil consolidation parameter (Cf), an increase in the mass of living and dead roots and cultural residues incorporated in the upper layer (0.0-0.1 m) of the soil (Bu), and a reduction in the subfactor prior land use (PLU) of the Rusle.

Section: Methodsmentioning

confidence: 99%

Rusle parameters for modeling the loss of a soil subjected to pig slurry application

Santos

Kaufmann

et al. 2018

Pesq. agropec. bras.

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“…On the Nitossolo, a Swansontype simulator was used, in which the arms are driven by an engine (Swanson, 1965). A buoyancy-type simulator, developed by Bertol et al (2012), where the movement of the arms occurs due to the water pressure, was used in the experiment conducted on the Cambissolo.…”

Section: Simulated Rain Tests and Rain Simulatorsmentioning

confidence: 99%

Impacts of Pig Slurry Applied to Two Different Soils on Nutrient Transport by Runoff

Kaufmann

Santos

et al. 2019

Rev. Bras. Ciênc. Solo

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Runoff in agricultural areas with intensive application of pig slurry can transport significant amounts of nutrients. This study evaluates the effects of different pig slurry (PS) application rates (0, 50, 100, and 200 m 3 ha-1) on nutrient loss through runoff during soybean cultivation under no-tillage. It was conducted at two sites in southern Brazil, one on an Alfisol (27° 43' south and 50° 3' west) and one on an Inceptisol (27° 47' south and 50° 18' west). The PS was applied to the soil once at the beginning of the soybean cycle. Each plot was 11 m long in the direction of the slope and 3.5 m wide. To induce runoff, artificial rainfall was applied in four different tests (T1, T2, T3, T4), with an intensity of 65 mm h-1 for 90 minutes. The first test was performed one day after PS application, while the other tests were performed throughout the soybean cycle. During each test, runoff samples were collected at 10-min intervals after the beginning of runoff. The runoff amount and the NO 3-, NH 4 + , P, and K + concentrations in the runoff were measured. In T1, nutrient transport from the Alfisol and the Inceptisol increased with increasing PS doses. In some cases, this effect was still noticeable in T2 and T3, but not in the last test (T4). The transported amounts of NO 3-, NH 4 + , P, and K + decreased as the period between PS application and simulated rainfall increased. Regardless of the soil and the treatment, NO 3 was transported in the greatest quantities, followed by K + , NH 4 + , and P.

“…To simulate rain, a simulator with rotating arms was used, which was installed between two plots, 3.5 m apart from each other, covering both. In the experiments on the Nitisol we used the Swanson type simulator (Swanson, 1965), while on the Cambisol, a pressurized rainfall simulator (Bertol et al, 2012).…”

Section: Experimental Plots and Rainfall Simulatorsmentioning

confidence: 99%

Water Infiltration in Two Cultivated Soils in Southern Brazil

Barbosa

Bertól

et al. 2015

Rev. Bras. Ciênc. Solo

Self Cite

Infiltration is the passage of water through the soil surface, influenced by the soil type and cultivation and by the soil roughness, surface cover and water content. Infiltration absorbs most of the rainwater and is therefore crucial for planning mechanical conservation practices to manage runoff. This study determined water infiltration in two soil types under different types of management and cultivation, with simulated rainfall of varying intensity and duration applied at different times, and to adjust the empirical model of Horton to the infiltration data.