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Vallone H.S.,Instituto Federal Of Educacao | Guimaraes R.J.,Federal University of Lavras | Mendes A.N.G.,Federal University of Lavras | Souza C.A.S.,CEPLAC | And 2 more authors.
Ciencia e Agrotecnologia | Year: 2010

With the objective of evaluating the effects of different recipients and substrates on the production of coffee tree seedlings (Coffea arabica L.), an experiment was carried out at the Coffee Sector of the Universidade Federal de Lavras, MG - UFLA, in the period of September 2003 to January 2004. The experiment was arranged in a randomized block design using a 3×3 factorial scheme. The recipients used were rigid polyethylene tubettes /50 mL capacity; tubettes /120 mL; and 10×20cm polyethylene bags with approximate capacity of 700 mL. The substrates used were alternative substrate, composed of 65% charred rice hulls + 35% commercial substrate; Plantmax HT®; and standard substrate, composed of 70% soil + 30% (sieved) cattle manure. The results obtained brought us to the conclusion that the type of recipient and substrate, in fact, significantly influence the development of coffee tree seedlings; and the recipients of larger volume (polyethylene bags and 120mL tubettes) filled with alternative and commercial substrates provide seedlings with improved growth rate. Source


Pereira M.C.,State University of Mato Grosso do Sul | Delabie J.H.C.,CEPLAC | Delabie J.H.C.,State University of Santa Cruz | Suarez Y.R.,State University of Mato Grosso do Sul | Antonialli Jr. W.F.,State University of Mato Grosso do Sul
Sociobiology | Year: 2013

Despite the environmental and economic importance of Pantanal, there are few studies quantifying the influence of sazonality and spatial variation on biological diversity in this ecosystem. In this context, the present work aimed to study the assemblage of ants associated with macrophytes during the flood and dry period of Paraguay river, in marginal environments in the Pantanal of Porto Murtinho, Mato Grosso do Sul. We observed a wide variation in the temporal distribution of the diversity of the assemblages of ants, since from 37 species, 36 occurred in the dry and 20 in the flood period. Of the total of macrophyte species observed, only in 12.5% we found a more specific correlation with ants that were nesting in spaces provided by plants representing a total of 10.52% of the species analyzed. Source


Martins L.C.B.,Federal University of Vicosa | Delabie J.H.C.,CEPLAC | Delabie J.H.C.,University Estadual Of Santa Cruz | Zanuncio J.C.,Federal University of Vicosa | Serrao J.E.,Federal University of Vicosa
Sociobiology | Year: 2013

The current knowledge of intramandibular glands in Hymenoptera is focused on occurrence and morphology in adult insects. This is the first report regarding the post-embryonic development of intramandibular glands in a "primitive" ant, Pachycondyla verenae. In this study, we analyzed mandibles of prepupae, white-eyed, pink-eyed and black-eyed pupae, pupa of pigmented body pupae, and adults. Adult workers of P. verenae have intramandibular glands with epidermal secretory cells of class I and isolated glands of class III, and both glands have onset differentiation in pink-eyed pupae. Some histological sections were submitted to histochemical test for total proteins and neutral polysaccharides. Histochemical tests showed occurrence of polysaccharides and proteins in epidermal secretory cells of class I from the white-eyed pupae, polysaccharides and proteins in pink-eyed pupae to black-eyed pupae in both glands classes I and III and presence of polysaccharides in adult ants also in both gland classes I and III. Intramandibular glands of classes I and III in P. verenae workers differentiate during pupation, with onset occurring in pink-eyed pupae, and completion occurring in black-eyed pupae. Source


Macedo R.,Embrapa Arroz e Feijao | Tarre R.M.,UFRuralRJ | Ferreira E.,UFRuralRJ | Rezende C.P.,CEPLAC | And 6 more authors.
Scientia Agricola | Year: 2010

A key contribution to study the cycling of nutrients in soil/plant/animal systems is the evaluation of the consumption of forage and their nutrients by cattle. The objective of this study was to test techniques to evaluate faecal production, in vitro digestibility, forage consumption and the proportion of legume in the acquired diet. Five Zebu steer calves were confined and fed five diets of different combinations of Brachiaria dictyoneura and Desmodium ovalifolium. All quantities of faeces were collected per animal and these values were found to compare favourably with those derived from using the chromium oxide technique. In vitro digestibility ranged from 7 to 10% higher than the actual in vivo digestibility. Faecal samples from steers fed with diets with 25% or more of grass in the mixture were found to be depleted in δ13C between 1.7 and 2.1‰, but no depletion was observed when the diet was 100% D. ovalifolium. There was a positive linear regression (r2 = 0.97***) of the δ13C of the diet with the δ13C of faeces, but if the acquired diet contained a very high proportion of legume, the legume content could be underestimated by as much as 10%. None of the internal indicators, such as lignin or ash content of the diets, were useful to predict feed intake, but the chromium oxide external indicator performed satisfactorily. The 13C analysis of the faeces was an effective predictor of the proportion of the legume in the consumed diet. Source

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