Comparison of simplified methods for estimating reference crop evapotranspiration (ETO) for brazilian coffee growing regions [Comparação entre métodos simplificados de estimativa da evapotranspiração de referência (ETo) para regiões produtoras de café brasileiras]
de Franca Neto A.C.,Engineering Agronomo |
Mantovani E.C.,Federal University of Viçosa |
Vicente M.R.,Engineering Agronomo |
Vieira G.H.S.,Engineering Agronomo |
And 2 more authors.
Coffee Science | Year: 2011
The present study aimed to estimate and compare the reference evapotranspiration - ETo of two simplified methods, Hargreaves-Samani (HS) and FAO Blaney-Criddle (BC), with the FAO Penman-Monteith (PM) method. The results of the estimates were obtained on the basis of weather data available at each location under study, with the help of Irriplus software. Cities of interest for the study were selected according to the representativeness of the characteristics of the region between the main Brazilian producing centers of Arabica coffee (Coffea arabica L.): Cerrado, East, South and Zona da Mata of Minas Gerais, West and Southwest Bahia, with the selected cities being: Araguari, Patrocinio, Caratinga, Lavras, Varginha and Viçosa, in Minas Gerais; and Vitória da Conquista and Barreiras in Bahia. In all locations, the HS equation adjusted better to the PM equation, which is recommended for the management of irrigation in conditions of limited availability of climate data.
Modolo A.J.,Federal Technological University of Paraná |
Franchin M.F.,Instrutora SENAR PR |
Trogello E.,Federal University of Viçosa |
Adami P.F.,Federal Technological University of Paraná |
And 2 more authors.
Engenharia Agricola | Year: 2013
Crop-livestock integration can be defined as a system that integrates both activities in order to maximize rational land use and minimize production costs. The work aimed to evaluate the sowing of maize with two furrowers mechanisms in a grazing area under different managements on integrated crop-livestock system. The experiment was carried out in a randomized block design with four replicates. The treatments consisted by four combination of grazing intensities (0.25-0.05; 0.30-0.10; 0.35-0.15 m and ungrazed, respectively to the pasture height at the entry and exit of animals from the paddocks) and two furrowers mechanisms (shoe and double disc). Bulk density and soil macroporosity were evaluated post graze, as well as sowing depth, area of mobilized soil, plant stand and corn yield. Areas with highest grazing intensity provided a significant increase in bulk density. The area of mobilized soil was 0.0071 and 0.0103 m2 for the double disc and rod, respectively, having the rod presented greater sowing depth. For the furrower mechanism of double disc type, the yield decreased linearly with the increase of grazing intensity, and the same was mitigated when the rod was used.
Agroecological cultivation of eggplant under different doses of organic fertilization using perennial species as cover crops [Cultivo agroecológico de berinjeleira sob doses de adubação orgânica em coberturas vivas perenes]
dos Santos C.A.B.,Federal Rural University of Rio de Janeiro |
Rocha M.V.C.,Engineering Agronomo |
Espindola J.A.A.,Embrapa Agrobiologia |
Guerra J.G.M.,Embrapa Agrobiologia |
And 2 more authors.
Horticultura Brasileira | Year: 2013
Agronomic performance of eggplant was evaluated under organic management, comparing perennial grass and legume species as cover crops. The trial was carried out in Seropédica, Rio de Janeiro state, Brazil, using a randomized block design with a split plot arrangement and three replications. The evaluated treatments in the plots were forage peanut (Arachis pintoi) as cover crop, Bahia grass (Paspalum notatum) as cover crop, and conventional soil tillage (control). Split plot treatments were represented by increasing dosages of poultry litter, corresponding to 120, 240, 480, and 720 g plant-1, which were partitioned through the eggplant cycle. The viability of forage peanut used as living mulch for eggplants was evidenced by the fact that its results did not differ statistically from conventional soil tillage for yield, number of fruits per hectare and average fruit weight of eggplant. The only exception is related to the use of forage peanut associated to the greatest dosis of organic fertilizer (720 g plant-1), which has shown superior results when compared to conventional soil tillage. Maximum values were obtained with poultry litter dosage of 600 g plant-1 (60.63 t ha-1) and 480 g plant-1 (55.80 t ha-1) for forage peanut and soil tillage treatments, respectively. On the other hand, Bahia grass did not allow to reach maximum eggplant yield, even at the highest dosage of poultry litter, indicating competition imposed by the cover crop. The results indicate agronomic feasibility of eggplant grown under agroecological management, with forage peanut as soil cover crop. The highest yield of eggplant was obtained with the use of 600 g plant-1 of poultry litter.