Santa Maria do Suaçuí, Brazil
Santa Maria do Suaçuí, Brazil
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Gonzalez M.L.F.,Federal University of Rio Grande do Sul | Jahnke S.,Federal University of Rio Grande do Sul | Morais R.M.,FEPAGRO | da Silva G.S.,Federal University of Rio Grande do Sul
Revista Colombiana de Entomologia | Year: 2014

Predator’s appearance in eco-systems is fundamental to regulate phytophagous insect population. Knowledge about associate’s species in every system is very important to understand the dynamic events and to help the management of possible pests. The predator diversity of an irrigated rice organical production agroecosystem (AO) and a preserved area, Refúgio de Vida Silvestre Banhado dos Pachecos (RBP), both located in Viamão country, RS, Brazil, was studied and compared between out fauna index monthly catches were taken from May/2011 to April 2012, with Malaise, Moericke and Pitfall traps, for 24 hours every time. Were colected in AO 355 predators, identificated in 26 morphotypes and distributes in four orders and 11 families. The RBP group found 653 individuals of 50 morphotypes, belonged to six orders and 13 families. The richness estimators, Chao 1, Chao 2 and Bootstrap, indicate from 29 to 35 species richness in the AO and 59 to 71 in the RBP group. RBP present more diversity according diversity index (P = 0,01) than AO. Seasonal variation had influence in differences, to the richness and the abundance of species, in both areas. January was the month with more abundance of individuals in both areas. Considering the composition of the species, 18 morphotypes were shared in between two ambient, unless little structural complexity available in the rice area, which indicate that RBP can serve as a predators species reservoir. © 2014 The American Society for Cell Biology.

Radin B.,FEPAGRO | Lisboa B.B.,FEPAGRO | Witter S.,FEPAGRO | Barni V.,FEPAGRO | And 3 more authors.
Horticultura Brasileira | Year: 2011

The choice of cultivars has important significance in achieving success in strawberries cultivation. However, the experiments with cultivars are usually carried out in conventional systems of production and not in soilless growing systems. Due to this, the present research intended to assess the performance of some strawberry cultivars in soilless growing system, inside the greenhouse, in two regions with different ecoclimatic conditions, in Eldorado do Sul (Depressão Central) and Caxias do Sul (Serra do Nordeste), in Rio Grande do Sul State. Four strawberry cultivars were tested: Aromas, Camarosa, Oso Grande and Tudla. The planting was in May 2005, and the seedlings were placed in bags containing substrate composed of 50% of peat and 50% charred rice hulls. The fertilizer was supplied by fertirrigation. Fruits were harvested when 70% of them presented red color up to fully mature. The results showed that the cultivation of strawberries in this system led to lower yield per plant than in a traditional system, but provides better use of internal greenhouse, with positive consequences in yield per area, due to the high density of plants and the facility to manage the crop. The highest productivity was obtained in Caxias do Sul (235.8 g plant -1) compared to Eldorado do Sul (196.4 g plant -1) without interaction between locations and cultivars. In Caxias do Sul, the cultivars Aromas, Oso Grande and Camarosa presented highest yield when compared to Tudla, but there was no difference in Eldorado do Sul.

Stroschein M.R.D.,Campus Universitario | Eltz F.L.F.,Campus Universitario | Antoniolli Z.I.,Campus Universitario | Lupatini M.,Campus Universitario | And 3 more authors.
Scientia Agricola | Year: 2010

Legume species belonging to the genus Lupinus are annual herb plants. The majority of them are indigenous to the Americas. They are known for nitrogen-fixing symbioses with soil bacteria collectively called rhizobia. The aim of this study was to characterize a rhizobium strain isolated from Lupinus albescens using phenotypic, symbiotic and molecular approaches. Strain UFSM LA 1.3 was tested in vitro according to several parameters: colony size, color and growing rate; acid or alkaline reaction in yeast mannitol media supplemented with bromothymol blue; gum production. Molecular characterization was evaluated by PCR technique using primers BOX A1-R and sequence analysis of the 16S-23S rDNA intergenic region (ITS). ITS sequencing fragments showed genetic similarity with Bradyrhizobium sp. The polymorphism observed by BOX-PCR have shown that strain differs from the reference strain SEMIA 928 and SEMIA 938. The symbiotic efficiency under axenic conditions of UFSM LA 1.3 was 94.6%, without statistical differences compared to the mineral nitrogen fertilized control, to which was applied solution of 400 mg of ammonium nitrate.

Fermino M.H.,FEPAGRO | Goncalves R.S.,Federal University of Rio Grande do Sul | Battistin A.,FEPAGRO | Silveira J.R.P.,FEPAGRO | And 2 more authors.
Horticultura Brasileira | Year: 2010

A study was held to evaluate the physical and chemical characteristics of wastes from the extraction of the heart of the Australian real palm (Archontophoenix alexandrae), in order to use it as substrates for plants. Samples from inland and from seaside were subdivided into leaves, stipe and cartridge (sheaths) and analyzed in the in natura form and after acid hydrolysis. All samples were characterized by humid and dry density, total porosity, aeration space and availability of water, pH, electric conductivity and total content of soluble salts. There was no statistical difference among the samples for the studied physical characteristics. The samples from seaside did not differ from those from inland and the samples that have suffered acid hydrolysis did not differ from those in natura. Also, the parts of the plant (leaves, stipe and cartridge) showed no significant differences among themselves. The results of chemical characteristics showed the utilization of wastes from the production of palm heart canning as substrates for plants is not recommended. Additionally, the results evidenced the need for new studies with waste from controlled planting of Australian real palm.

The Butia genus (Arecaceae) is a small genus with subtropical species distributed in South America widely used as an ornamental plant. Besides, its fruits are appreciated for its unique flavor and aroma. But in some regions of the state of Rio Grande do Sul natural populations suffer with the progress of rural activities and development of buildings. The aim of this study, therefore, was characterizing eight populations of Butia capitata through AFLP markers. By analysis of molecular variance was possible to verify that 83.68% of the genetic variability is attributed to variation among populations and 13.67% is attributed to differences among populations within regions. In the pair-wise analysis, differences between 15 populations were significant, with an average of 14.72% of molecular variation attributed to differences between populations. This result indicates the presence of genetic variability distributed among all populations, without subdivision arising from geographical isolation.

PubMed | FEPAGRO, University of Northern Paraná, University of Brasilia and Federal University of Rio Grande do Sul
Type: Journal Article | Journal: International journal of biometeorology | Year: 2016

The aim of this study was to evaluate the bioclimatic thermal stress assessed by Equivalent Temperature Index (ETI) and Temperature Humidity Index (THI) on Braford and Nellore bulls sperm quality during the reproductive seasons at the tropical region in the Brazilian Pantanal. We used 20 bulls aged approximately 24months at the beginning of the study. Five ejaculates per animal were collected using an electroejaculator. Temperature, air humidity, and wind speed data were collected every hour from the automatic weather station at the National Institute of Meteorology. Infrared thermography images data were collected to assess the testicular temperature gradient in each animal. Data were analyzed with ANOVA using MIXED procedure of SAS and means were compared using Tukeys HSD test. The THI and ETI at 12days (epididymal transit) were higher in January (89.7 and 28.5, respectively) and February (90.0 and 29.0, respectively) compared to other months (P<0.01). Total seminal defects differ only in Bradford bulls between the months of November and February. Nellore bulls had lower major defects (MaD) and total defects (TD) compared to Braford. Nellore bulls showed correlation between minor defects (MiD) and THI for 30days (0.90) and 18days (0.88; P<0.05). Braford bulls showed correlation for MaD (0.89) in ETI for 12days (P<0.05). Infrared thermography showed no difference between animals. Reproductive response to environmental changes is a consequence of Nellore and Braford adaptation to climate stress conditions. Both THI and ETI environmental indexes can be used to evaluate the morphological changes in the seminal parameters in Nellore or Braford bulls; however, more experiments should be performed focusing on larger sample numbers and also in reproductive assessment during the consecutive years to assess fertility potential.

PubMed | FEPAGRO, University of Northern Paraná, University of Brasilia and Federal University of Rio Grande do Sul
Type: Journal Article | Journal: International journal of biometeorology | Year: 2016

The objective of this study was to evaluate the seasonal effects of the environment on sperm quality in subtropical region determined by temperature and humidity index (THI). We used 20 Brangus bulls (5/8 Angus3/8 Nellore) aged approximately 24 months at the beginning of the study. Semen evaluations were performed twice per season during 1 year. Climate THI data were collected from an automatic weather station from the National Institute of Meteorology. Infrared thermography images were used to determine the temperature of the proximal and distal poles of the testis to assess the testicular temperature gradient (TG). The seasonal effects on seminal and climatic variables were analyzed with ANOVA using MIXED procedure of SAS. Sperm motility in spring (60.1%), summer (57.6%), and autumn (64.5%) showed difference compared to winter (73.0%; P<0.01). TG was negatively correlated with THI at 18 days (spermiogenesis) (-0.76; P<0.05) and at 12 days (epididymal transit) (-0.85; P<0.01). Ocular temperature (OcT) had a positive correlation with THI at 18 days (0.78; P<0.05) and at 12 days (0.84; P<0.01). Motility showed a negative correlation with THI only at 18 days (-0.79; P<0.05). During spermiogenesis, the TG had higher negative correlation compared to OcT (-0.97; P<0.01) and rectal temperature (-0.72; P<0.05). Spermatozoa with distal midpiece reflex were correlated with THI during transit epididymis (0.72; P<0.05). Seminal parameters are not affected when THI reaches 93.0 (spermiogenesis) and 88.0 (epididymal transit). We concluded that infrared thermography can be adopted as an indirect method in order to assess the effect of environmental changes in TG and OcT of Brangus bulls.

Sanes F.S.M.,Federal University of Santa Maria | Strassburger A.S.,FEPAGRO | Araujo F.B.,Federal University of Pelotas | Medeiros C.A.B.,EMBRAPA - Empresa Brasileira de Pesquisa Agropecuária
Semina:Ciencias Agrarias | Year: 2015

The volumes of waste generated in the fishing activity are increasing due to the increase in demand for these products. This implies the need for fast processing and cycling of these materials. Thus, the aim of this study was to evaluate the use of waste generated in the fishing activity as a source of organic fertilizers in agricultural production systems familiar ecological basis. The experiment was conducted at the Experimental Station Cascade/Embrapa Temperate Climate was assessed throughout the composting process and the fermentation of fish waste, identifying the main points that enable the use of these fertilizers in farming systems ecological base. The composting process of rice husk revealed be incomplete during the experiment. The compound prepared with fish waste and exhausted bark of acacia presents itself as a good source of nutrients for crops, which may be suitable as organic fertilizer for production of ecologically-based systems. For liquid organic fertilizer, the conditions under which the experiment was conducted, it is concluded that the compound resulting from aerobic or anaerobic fermentation of fish waste, present themselves as a viable source of nutrients for productive systems of ecological base. However, further studies need to be conducted to better understanding and qualification of both processes.

The term "substrate for plants" refers to the growth medium used in cultivation in containers, often resulting from the mixture of materials. The final quality depends on the physical and chemical attributes of each component and the interaction among them, which need to be characterized. Although the reference works are unanimous including volumetric density for substrate characterization, the interpretation of reports from different laboratories is difficult, because they use different methods or variations of the same method. In addition to the differences between methods, there might be other causes of variation in the achievement of results from a single sample. This work aims to demonstrate two of the causes of variation in the determination of density by volume: 1) the method of analysis [method of double ring (CEN), the method used by the industry (IND) and method of auto compact (AUTO) of substrate dust] of coconut, washed sand of river, peat brown in natura and Plantmax® for horticulture; 2) and the initial level of humidity (0.62, 0.69 and 0.72 g/g) in in natura samples of peat brown. The density values, determined by the AUTO, represented about 20% more than the values determined by IND; relations between the AUTO and CEN methods as well as CEN and IND were not uniform, depending on the material. Initial moisture of the sample also represents the cause of variation in the results.

The objective of this study was to identify and to report the occurrence of one of the insects that feeds on the seeds of the pindo palm (Butia odorata). The material was collected in the city of Viamão, Rio Grande do Sul state, Brazil. The larvae obtained in mature fruit were developed in a gerboxe containing sterilized wet sand substrate and not under controlled conditions. The larvae found in the endocarps of Pindo palm originated insects Curculionidae identified as Revena plaumanni Bondar, 1943. Comments about it’s biology and behavior are based on the observations performed in the laboratory. © 2016, Sociedade Brasileira de Fruticultura. All rights reserved.

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