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| Zwirtes,Anderson Luiz; Reinert,Dalvan José; Gubiani,Paulo Ivonir; Silva,Vanderlei Rodrigues Da; Mulazzani,Rodrigo Pivoto; Somavilla,André. |
| Abstract: The objective of this work was to evaluate the effect of different amounts of black oat (Avena strigosa) straw covering soil surface on soil temperature at different depths. The treatments consisted of 0, 3, 6, and 9 Mg ha-1 straw. Soil temperature was measured hourly by a thermocouple inserted at different depths (0, 5, 15, 30, and 50 cm) and was used to adjust an equation correlating the temperature of covered soil with that of bare soil. With the correlations, it was possible to observe a point value of temperature (inversion temperature of straw effect), below which the presence of straw acts positively on the maintenance of soil temperature and above which the presence of straw acts negatively on soil heating. |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Avena strigosa; Inversion temperature; Mulch effect; No-tillage; Plant residue; Soil thermal regime. |
| Ano: 2017 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-204X2017001101127 |
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| Somavilla,André; Gubiani,Paulo Ivonir; Zwirtz,Anderson Luiz. |
| ABSTRACT: Quantification of runoff rate is an onerous task with non-automated devices; it requires a lot of manual labor to perform measurements. In this study, an automatic device to quantify the surface runoff rate from plots with a small area was developed and tested. The prototype was based on the tipping bucket technique and built with reused materials. Its performance was tested in the laboratory and a calibration curve was developed to improve measurement accuracy. The device can be used for automatic quantification of surface runoff in small plots, with a flow rate of less than 750 × 103 mm3 min-1. The device can be built with different dimensions to measure different flow rates. In that case, the error measurements and calibration curve must be... |
| Tipo: Info:eu-repo/semantics/report |
Palavras-chave: Tipping bucket; Gauge; Flow rate; Watershed. |
| Ano: 2019 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832019000100504 |
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| Gubiani,Paulo Ivonir; Müller,Eduardo Augusto; Somavilla,André; Zwirtes,Anderson Luiz; Mulazzani,Rodrigo Pivoto; Marchesan,Enio. |
| ABSTRACT Water and oxygen deficiencies in the soybean crop cultivated on lowland soils are an important topic of research. The objective of this study was to investigate changes in water and oxygen supply and soybean yield caused by soil management in lowland soils. A soybean crop was grown under four soil conditions: no-tillage (NT), chiseling (CH), ridge tillage on no-tillage (NTR), and ridge tillage on chiseling (CHR). Soil bulk density, total porosity, macro- and microporosity, air permeability, and saturated hydraulic conductivity were measured at 0.05, 0.15, 0.25, and 0.35 m depths. Soil volumetric water content was monitored at the same depths every 30 min during the soybean cycle. The transpiration coefficient was calculated from volumetric water... |
| Tipo: Info:eu-repo/semantics/article |
Palavras-chave: Water stress; Oxygen deficiency; Water table. |
| Ano: 2018 |
URL: http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-06832018000100414 |
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