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Queiroz V.A.V.,Brazilian Agricultural Research Corporation Embrapa | da Silva C.S.,Centro Universitario Of Sete Lagoas Unifemm | de Menezes C.B.,Brazilian Agricultural Research Corporation Embrapa | Schaffert R.E.,Brazilian Agricultural Research Corporation Embrapa | And 4 more authors.
Journal of Cereal Science | Year: 2015

The carbohydrates, proteins, lipids, fibers (Neutral Detergent Fiber - NDF) and ash contents of 100 sorghum genotypes were evaluated and superior materials for each nutrient were identified. The genotypes were grown in environments without (WoWS) and with post-flowering water stress (WthWS). Tocher analysis grouped data into 9 clusters showing great variability for the nutritional characteristics, which were not influenced by race or place of origin. The carbohydrates, proteins, lipids, fibers and ash contents had, respectively, the following variations: 55.2-75.2%; 8.6-18.9%; 1.7-4.9%; 9.3-25.2% and 1.1-2.4%, in both environments. The best results were identified in the genotypes BR007B, SC59 and SC1033 for carbohydrates, SC325, SC320 and SC124 for proteins, SC35, N268B and Lian Tang Ai for lipids, SC673, SC467 and (SN142) REDBINE SA386-60 (ASA N98) for fiber and SC224, SC566, SC467 and SC1356 for ash. The carbohydrate, protein and ash contents were lower and the fiber was higher in samples grown in the environment with water stress. Lipids were not affected by the water stress. The genotypes listed above have great potential to develop cultivars with high nutritional value, especially to arid and semi-arid regions and may contribute to food security. © 2015 Elsevier Ltd. Source

de Matos A.T.,Federal University of Vicosa | Silva D.F.,Centro Universitario Of Sete Lagoas Unifemm | lo Monaco P.A.V.,Federal University of Santa Maria | Pereira O.G.,Federal University of Vicosa
Engenharia Agricola | Year: 2013

The issue of this study was to evaluate the effect of different rates of landfill leachate (LL) in productivity and chemical composition of Tifton 85 (Cynodon spp). The leachate was applied at rates of 0 (control), 250, 500, 750, 1,000 kg ha-1 d-1 of BOD5, for eight months. In the control treatment, not receiving the leachate, it was applied water from the public supply network being the water depth of application defined based on the Reference Evapotranspiration (ETo). The experiment was analyzed in a split plot, with five plots concentrations of BOD5 and the cuts the subplots in a randomized block design with four replications. The data were subjected to analysis of variance and regression. The dry matter yield, crude protein levels and concentrations of N, K, Na, Ca, Mg, Mn, Cd, Pb and Fe, in the aerial parts of the Tifton 85, increased with the application rates of the percolate. The concentration of N, P and Mn tended to decrease with the number of grass cuts; for Cd, Pb and Fe tended to stabilize after the 2nd or the 3rd cuts; and the Na increase after the 3rd cut. The K, Ca and Mg concentrations were unstable. Source

Calazans G.M.,Fundacao de Ensino Superior de Itabira FUNCESI | de Oliveira C.A.,Centro Universitario Of Sete Lagoas Unifemm | Cruz J.C.,Centro Universitario Of Sete Lagoas Unifemm | Matrangolo W.J.R.,Centro Universitario Of Sete Lagoas Unifemm | Marriel I.E.,Centro Universitario Of Sete Lagoas Unifemm
Ciencia Rural | Year: 2016

Cratylia argentea is a leguminous shrub native to the cerrado, which has great potential for forage production and recovery of degraded areas. This study aimed to isolate, characterize, and select efficient rhizobial strains in symbiosis with Cratylia argentea. Rhizobacteria were isolated from the nodules of 12-month-old plants and cultivated in pots containing cerrado soil. Twenty-five bacterial strains were obtained, which displayed extensive variability with respect to morphological and symbiotic characteristics. Cratylia argentea seeds were planted in pots containing 5kg of cerrado soil and maintained in the greenhouse. The treatments consisted of 25 rhizobial isolates, two controls (without nitrogen and without inoculation), with or without nitrogen fertilization (5mgN·plant−1·week−1), and four replications. Plants were cultivated for 150 days after planting seeds to evaluate nodule number, nodule dry weight, shoot and root dry weight, shoot and root N content, and relative and symbiotic efficiency. Thirteen isolates improved shoot dry weight (up to 65.8%) and shoot nitrogen concentration (up to 76%) compared with those of control treatments. Two isolates, 4 (CR42) and 22 (CR52), conferred higher symbiotic efficiency values of approximately 20%. Therefore, these two rhizobial isolates displayed the highest potential as beneficial inoculants to optimize the symbiotic efficiency for Cratylia and to increase the incorporation of nutrients and biomass into the productive system in the cerrado. © 2016, Universidade Federal de Santa Maria. All rights reserved. Source

Queiroz V.A.V.,Nucleo de Recursos Geneticos e Desenvolvimento de Cultivares | de Oliveira Guimaraes P.E.,Nucleo de Recursos Geneticos e Desenvolvimento de Cultivares | Queiroz L.R.,Centro Universitario Of Sete Lagoas Unifemm | Guedes E.O.,University of Jose do Rosario Vellano | And 4 more authors.
Ciencia e Tecnologia de Alimentos | Year: 2011

The aim of this study was to characterize the Zn and Fe availability by phytic acid/Zn and phytic acid/Fe molar ratios, in 22 tropical maize inbred lines with different genetic backgrounds. The Zn and Fe levels were determined by atomic absorption spectrophotometry and the P through colorimetry method. Three screening methods for phytic acid (Phy) analysis were tested and one, based on the 2,2'-bipyridine reaction, was select. There was significant variability in the contents of zinc (17.5 to 42 mg.kg-1), iron (12.2 to 36.7 mg.kg-1), phosphorus (230 to 400 mg.100 g-1), phytic acid (484 to 1056 mg.100 g-1), phytic acid P (140 to 293 mg.100 g-1) and available-P (43.5 to 199.5 mg.100 g-1), and in the available-P/total-P ratio (0.14 to 0.50), Phy/Zn (18.0 to 43.5) and Phy/Fe (16.3 to 45.5) molar ratios. Lines 560977, 560978 and 560982 had greater availability of Zn and lines 560975, 560977, 561010 and 5610111 showed better Fe availability. Lines 560975, 560977 and 560978 also showed better available-P/total-P ratio. Thus, the lines 560975, 560977 and 560978 were considered to have the potential for the development of cultivars of maize with high availability of Fe and/or Zn. Source

Queiroz V.A.V.,Brazilian Agricultural Research Corporation Embrapa | De Oliveira Alves G.L.,Centro Universitario Of Sete Lagoas Unifemm | Da Conceicao R.R.P.,Centro Universitario Of Sete Lagoas Unifemm | Guimaraes L.J.M.,Brazilian Agricultural Research Corporation Embrapa | And 3 more authors.
Food Control | Year: 2012

Fumonisins and zearalenone are mycotoxins produced by Fusarium spp. that commonly contaminate maize and its derivative products. Recent reports have shown that fumonisin B2 and B4 might also be produced by Aspergillus niger and Tolypocladum species, although their prevalence in maize is for sure connected to Fusarium species. The aim of this study was to evaluate the occurrence of fumonisins and zearalenone in maize, stored in 10 family farms located in the State of Minas Gerais, Brazil. Samples were collected in four periods, at intervals of two months, totalling 40 samples. Mycotoxins were isolated using commercial immunoaffinity columns and its concentrations were evaluated by fluorometric technique. Fumonisins were detected in all 40 samples, with values ranging from 230 to 6450 μg kg -1, and zearalenone was detected in 38 maize samples, with levels from 1.8 to 99 μg kg -1. Zearalenone levels were below the acceptable limit for human consumption but the fumonisins levels were above this limit in most samples, implying in risks to consumers' health. © 2012 Elsevier Ltd. Source

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