Picoli E.A.T.,Federal University of Viçosa |
Isaias R.M.S.,Federal University of Minas Gerais |
Ventrella M.C.,Vicosa MG
Bioscience Journal | Year: 2013
In the present work the anatomical, histochemical and micromorphological features of S. granuloso-leprosum leaves were approached in order to evaluate its characteristics associated with its pioneer role. Glandular and non-glandular trichomes were observed on both epidermal surfaces, although in greater number on the ab axial surface. Stellate trichomes presented a thick lignified cell wall. Leaves were amphiestomatic with a single palisade layer and a slightly smaller spongy parenchyma. The epidermal cells of the abaxial surface were shorter than the adaxial ones, both with stomata paracytic. Vascular bundles were bicolateral and idioblasts with conspicuous crystalliferous inclusions were observed in the mesophyll. Lipid drops were evidenced in the spongy parenchyma by Sudan III, Nile Blue, Nadi reagent and Sudan Black histochemical tests. Negative results for alkaloids and phenol compounds were observed. The evaluated anatomical and hystochemical data highlights mesophytic characteristics in accordance with S. granuloso-leprosum pioneer plant role.
Characterization and genetic divergence of corn populations rescued from the region southeastern of Minas Gerais [Caracterização e divergência genética de populações de milho resgatadas do Sudeste de Minas Gerais]
Coimbra R.R.,Biologicas UFT |
Miranda G.V.,Vicosa MG |
Cruz C.D.,Vicosa MG |
de Melo A.V.,Federal University of Viçosa |
Eckert F.R.,Federal University of Viçosa
Revista Ciencia Agronomica | Year: 2010
The objective of this work was to characterize and evaluate corn populations rescued from the southeastern of Minas Gerais, concerning potential yield and genetic divergence. Were used quantitative and qualitative descriptors of corncob and caryopsis to discrimination of populations. The experiment was installed in a randomized complete block design with two replications. Were evaluated four commercial hybrids, five landraces populations and seven farmers' field populations. Sixteen descriptors were applied to the germoplasm, being nine quantitative and seven qualitative. For quantitative descriptors genetic divergence was estimated based on canonical variables. For qualitative descriptors, cluster analysis was applied based on the method of optimization of Tocher, where the distance to multicategory data was the measure of dissimilarity between genotypes. There is genetic variability between the populations evaluated considering the descriptors in question. The quantitative descriptors that contributed most to the genetic divergence between the genotypes were number of grain rows, grain width and cob diameter. Some populations may have been crossed with commercial hybrids in rural properties and some populations have potential to be used in breeding programs, therefore this information on similarity should be used altogether.
Neto M.C.,SEBRAE |
Campos J.M.S.,University of Pernambuco |
de Oliveira A.S.,Institute Ciencias Agrarias e Ambientais |
Gomes S.T.,Vicosa MG
Revista Brasileira de Zootecnia | Year: 2012
The objective of this study was to identify and quantify benchmarks of milk production systems. The technological profile and size, livestock and economic indicators of sixteen farms in the region of Triângulo Mineiro were analyzed. Indicators correlated with rate of return on capital (RRC) were identified and quantified in four scenarios of RRC (6, 8, 10 and 12% per year). The correlated indicators and their respective values in the four scenarios were: land (99, 90, 81 and 73 ha); relation of total cows in lactation (74, 77, 79 and 82%); lactating cows per area (0.89; 0.99; 1.11 and 1.22 cows/ha); milk production per lactating cow (12.04; 13.00; 13.96 and 14.92 liters/cow/day); milk production per total cows (9.19; 10.23; 11.27 and 12.31 liters/cow/day); labor productivity (322, 349, 375 and 402 liters/day/man); land productivity (4351, 5236, 6120 and 7004 liters/ha/year); participation of total effective operational cost of activity in the gross revenue of the activity (69, 66, 63 and 60%); participation of total operational cost of activity in the gross revenue of the activity (80, 76, 72 and 69%); participation of total cost of activity in the gross revenue of the activity (93, 88, 82 and 77%); labor cost in relation to milk gross revenue (15, 13, 11 and 9%); profitability (15, 19, 23 and 28%); and capital investment in the activity in relation to daily milk production (922, 829, 736 and 644 R$/liter-day). The productivity of the factors land and animals present more correlation with profitability than labor productivity, regardless of the production size. ©2012 Sociedade Brasileira de Zootecnia.
Valente D.S.M.,Vicosa MG |
de Queiroz D.M.,Vicosa MG |
Pinto F.A.C.,Vicosa MG |
Santos F.L.,Vicosa MG |
Santos N.T.,Vicosa MG
Engenharia Agricola | Year: 2014
Precision agriculture based on the physical and chemical properties of soil requires dense sampling to determine the spatial variability of these properties. This dense sampling is often expensive and time-consuming. One technique used to reduce sample numbers involves defining management zones based on information collected in the field. Some researchers have demonstrated the importance of soil electrical variables in defining management zones. The objective of this study was to evaluate the relationship between the spatial variability of the apparent electrical conductivity and the soil properties in the coffee production of mountain regions. Spatial variability maps were generated using a geostatistical method. Based on the spatial variability results, a correlation analysis, using bivariate Moran's index, was done to evaluate the relationship between the apparent electrical conductivity and soil properties. The maps of potassium (K) and remaining phosphorus (P-rem) were the closest to the spatial variability pattern of the apparent electrical conductivity.
Pinto P.S.,Vicosa MG |
Rubinger M.M.M.,Vicosa MG |
Guilardi S.,Institute Quimica UFU |
Paixao D.A.,Institute Quimica UFU |
Oliveira M.R.L.,Vicosa MG
Acta Crystallographica Section E: Structure Reports Online | Year: 2012
The title salt, (C 24H 20P) 2[Zn(C 2F 3NO 2S 3) 2], consists of a complex dianion and two tetraphenylphosphonium cations. The Zn II ion displays a distorted tetrahedral coordination environment with four S atoms from two S,S'-chelated N-(trifluoromethylsulfonyl)dithiocarbimate anions. In the crystal, besides the ionic interaction of the oppositely charged ions, intermolecular C-H···O interactions between cations and anions are observed. One of the cations interacts with an inversion-related equivalent by π-π stacking between phenyl rings, with a centroid-centroid distance of 3.932(4) Å.
Ribeiro C.L.N.,Vicosa MG |
Barreto S.L.T.,Vicosa MG |
Reis R.S.,Vicosa MG |
Muniz J.C.,Vicosa MG |
And 4 more authors.
Revista Brasileira de Zootecnia | Year: 2013
The objective of this study was to estimate the digestible lysine requirement of Japanese quails in the egg-laying phase. A total of 336 female Japanese quails (Coturnix coturnix japonica) of average initial age of 207 days were distributed in a completely randomized experimental design, composed of 6 treatments (lysine levels) with 7 replicates and 8 birds per experimental unit, with duration of 84 days. Experimental diets were formulated from a basal diet, with corn and soybean meal, with 2.800 kcal ME/kg and 203.70 g/kg crude protein, showing levels of 9.50; 10.00; 10.50; 11.00; 11.50; and 12.00 g/kg digestible lysine; diets remained isoprotein and isocaloric. The following variables were studied: feed intake (FI); lysine intake (LI); egg production per bird per day (EPBD); egg production per bird housed (EPBH); production of marketable eggs (PME); egg weight (EW); egg mass (EM); utilization efficiency of lysine for egg mass production(UELEM);feed conversion per mass (FCEM); feed conversion per dozen eggs (FCDZ); bird availability (BA); percentages of yolk (Y), albumen (A) and shell (S); specific egg weight(SW); nitrogen ingested(NI); nitrogen excreted(NE); and nitrogen balance(NB). Significant effect was only observed for LI, EW, EM, UELEM, FCEM, Y, A and SW. The digestible lysine level estimated in diets for laying Japanese quails is 11.20 g digestible lysine/kg diet, corresponding to an average daily intake of 272.23 mg lysine. © 2013 Sociedade Brasileira de Zootecnia.