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Details van artikel 120 van 185 gevonden artikelen
| Titel: |
Minilysimeter with constant groundwater table operating with Irrigâmetro® to calculate the reference evapotranspiration |
| Auteur: |
Franklin José VALBUENA MATERÁN Rubens ALVES DE OLIVEIRA Gilberto CHOHAKU SEDIYAMA Paulo Roberto CECON Hugo Alberto RUIZ Cristiano TAGLIAFERRE |
| Verschenen in: |
Revista científica UDO agrícola |
| Paginering: | Jaargang 9 (2009) nr. 1 pagina's 243-258 |
| Jaar: |
2009 |
| Inhoud: |
This investigation was carried out in the unit of research of the Irrigâmetro®, belonging to the Federal University of Viçosa, in Viçosa, state of Minas Gerais, Brazil. The experiments was conducted with the grass-batatais (Paspalum notatum Flugge), using 16 minilysimeters with Irrigâmetro® and constant groundwater. In the experiments the research design was entirely randomized. The Irrigâmetro® was development in the UFV for the Management of irrigation. The treatments comprised of four constant groundwater tables (15, 20, 25 and 30 cm of dept), established in the minilysimeters (M15, M20, M25 and M30), with four repetitions. The purposes of this investigation were: to determine the reference evapotranspiration (ETo), by means of the minilysimeters, with constant groundwater table and operating with Irrigametro®, as well as to evaluate their performance in relation to the modified Penman, Radiation, Hargreaves-Samani, pan and draining lysimeter methods. With the Penman-Monteith FAO 56 method being considered the standard method. The methods of M30, modified Penman, Radiation, draining lysimeter and Pan exhibited a good performance in the determination of the ETo. The methods that exhibited the worst performance were the Hargreaves-Samani and the minilysimeters M15, M20, M25, not being recommended their use for the estimate of the ETo, under conditions similar to those studied in this investigation, due to their low precision and accuracy. The highest consumption of water occurred in the 15 cm groundwater table, decreasing with depth. The external cylinder used as borders in the minilysimeters as buffer-area were not sufficient to avoid the clothesline effect. |
| Uitgever: |
Universidad de Oriente Press (provided by DOAJ) |
| Bronbestand: |
Elektronische Wetenschappelijke Tijdschriften |
Details van artikel 120 van 185 gevonden artikelen
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