Academicos do Curso de Agronomia

Rio de Janeiro, Brazil

Academicos do Curso de Agronomia

Rio de Janeiro, Brazil
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Maciel C.D.G.,State University of Maringá | Poletine J.P.,State University of Maringá | Raimondi M.A.,State University of Maringá | Rodrigues M.,Academicos do Curso de Agronomia | And 3 more authors.
Planta Daninha | Year: 2011

In order to evaluate the development of the grass species Bermuda (Cynodon dactylon), Emerald (Zoysia japonica) and Broadleaf Carpetgrass (Axonopus compressus) submitted to herbicide sub doses and growth regulators under two light conditions, three experiments were conducted in a greenhouse at Paraguaçu Paulista from September to December, 2006. For each grass species, the experimental design used was completely randomized, in a factorial scheme 6 x 2, with four replications, using two growth regulators (trinexapac-ethyl and ethephon), three herbicides applied in sub doses (clethodim, imazethapyr and metsulfuron-methyl), and a check without application. All treatments were evaluated under two light conditions, represented by plastic greenhouse (total light) and plastic greenhouse + shading 50% (partial light).The results obtained at 63 days after application showed that trinexapac-ethyl (250 g ha -1), clethodim (12 g ha -1) and imazethapyr (12 g ha -1) were the best growth regulators for the vegetative development of C. dactylon (65.8, 29.6 and 18.7%), Z. japonica (66.2, 40.7 and 49.7%) and A. compressus (56.5, 10.3 and 17.2%) grasses and for inflorescence emission of C. dactylon (100.0, 95.9 and 89.6%), under high and low luminosity. Ethephon (300 g ha 1) and metsulfuron-methyl (3.6 g ha -1) treatments were found to be the best options for reducing vegetative development (15.5 and 26.7%) and root dry matter (34.7 and 33.9%) of São Carlos grass (A. compressus), compared to trinexapac-ethyl. For C. dactylon and Z. japonica turf grass, under conditions where aesthetics preservation is fundamental, clethodim and imazethapyr may substitute trinexapac-ethyl growth regulator on account of the smaller visual damage in the grass. Further studies with growth regulators and herbicide sub doses must be conducted with other cultivated grasses to enable efficient and safe recommendations, based on scientific information generated from Brazilian conditions.

Trevisani N.,UDESC CAV | Schmit R.,Academicos do Curso de Agronomia | Beck M.,Academicos do Curso de Agronomia | Guidolin A.F.,UDESC CAV | Coimbra J.L.M.,Brazilian National Council for Scientific and Technological Development
Revista Brasileira de Fruticultura | Year: 2016

The objective of this study was to characterize the genetic variability in fisális populations and select promising parents based on fruit traits. The experimental design consisted of randomized blocks, with six populations. Five plants per treatment were sampled. The evaluated traits were fruit weight, capsule weight, 1000- seed weight and fruit diameter. The data were subjected to multivariate analysis of variance with error specification between and within (p <0.05). Mahalanobis’ distance was used as a measure of genetic dissimilarity. Significant differences for the assessed traits were detected between fisális populations. The ratio error among by within indicated no need for sampling within the experimental unit. Dissimilarity was greatest between Lages and Vacaria. The most discriminating traits were capsule weight, fruit weight and fruit diameter. The multivariate contrasts indicated differences between the populations of Vacaria and from Caçador, Lages and Peru, selected for hybridizations. © 2016, Sociedade Brasileira de Fruticultura. All rights reserved.

Muniz J.,Brazilian National Council for Scientific and Technological Development | Kretzschmar A.A.,Dra. Fruticultura | Rufato L.,Brazilian National Council for Scientific and Technological Development | Pelizza T.R.,Pos doutoranda | And 4 more authors.
Revista Brasileira de Fruticultura | Year: 2011

The culture of Physalis peruviana, the Solanaceae family, is still little explored in Brazil, but is a new option for diversification for small farmers, with good prospects for the domestic and international markets. It is an exotic fruit, belonging to the nightshade family and is known as 'camapum' and 'joá-de-capote', and can be confused with other species. It is a plant that can reach two meters in height when it is used an appropriate system, influencing plant development and quality of fruit produced. The objective was to evaluate the influence of four conduction systems in plants of Physalis in fruit production in two production cycles, during the years 2006-2007 and 2007-2008, in Lages, SC. It was evaluated the following conduction systems in "V", "X", simple and free espalier system. The experimental design was randomized blocks with four replicates and each experimental unit consisted of ten plants. It was observed that in two consecutive cycles, the "X" system showed the best results in most of the physico-chemical analysis, when compared with other conduction systems. It was conclude that the Physalis fits well the plateau region of Santa Catarina and that regardless of the conduction system used, the tutored plant under a conduction system had greater fruit weight, diameter and quality, thereby generating a result with higher commercial value.

da Silva A.B.,University of José do Rosário Vellano | da Silva J.M.S.F.,Federal University of Alfenas | da Silva J.A.S.,Academicos do Curso de Agronomia | Togoro A.H.,Academicos do Curso de Agronomia
Bioscience Journal | Year: 2011

Kefir is a probiotic used for human nutrition because of medicinal and nourishing properties. The purpose of this paper was to evaluate the foliar anatomy and in vitro growth of orchids cultivated at different concentrations of Knudson medium, kefir and sucrose. The treatment consisted of different culture media: 25% of Knudson (KD) salts + 75% of kefir (KF); 50% of KD + 50% of KF; 75% of KD + 25% of KF, volume per volume (v/v) at every possible combination with either 10 g.L-1 or 20 g.L-1 of sucrose. Two other treatments were done: one with 100% of Knudson salts added with 20 g.L-1 of sucrose, and the other with kefir alone. The culture medium had the pH adjusted to 5.8 and was solidified with agar 7 g.L-1. Forty mL of culture medium were distributed into 250 mL-vessels, which were then autoclaved at 120 °C for 20 minutes. The best results for the in vitro growth were obtained with 50% KD + 50% KF with 20 g.L-1 of sucrose. The anatomical studies revealed that the 25% KD + 75% KF culture medium with 10 g.L-1 and 20 g.L-1 elicited a thicker foliar mesophile, being followed by 50% KD + 50% KF with 10 g.L-1 of sucrose, and 75% KD + 25% KF with 20 g.L-1 of sucrose.

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