Back A.J.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina
Acta Scientiarum - Agronomy | Year: 2011
A knowledge of rainfall time distribution is important for several types of hydrological studies related to surface runoff. This study aims to determine the time distribution pattern of heavy rain events in Urussanga, Santa Catarina State, Brazil. It employed recording rainfall charts from the meteorological station of Urussanga (latitude: 28.31° S, longitude: 49.19° W, altitude: 49 m) from 1980 to 2007. Rain events were classified into four types according to the duration quartile in which the greatest amount of precipitation occurred. It is found that type I rain events are more frequent, followed by type II, and these occur predominantly during the summer, while type III and IV rain events are distributed throughout the year. In the summer, rain events that last for less than 12 hours are more frequent, whereas during the rest of the year, rain events that last for more than 18 hours are most common.
Selection of potato clones for industrial processing under subtropical and temperate climate conditions [Seleção de clones de batata para processamento industrial em condições de clima subtropical e temperado]
Souza Z.S.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina |
Bisognin D.A.,Federal University of Santa Maria |
Morin Junior G.R.,Federal University of Santa Maria |
Gnocato F.S.,Federal University of Santa Maria
Pesquisa Agropecuaria Brasileira | Year: 2011
The objective of this work was to select potato clones for industrial processing, cultivated under subtropical and temperate conditions in Southern Brazil. Thirty advanced clones and three cultivars (control) were evaluated in the Spring of 2007 and 2008, and in the Autumn of 2008, in Júlio de Castilhos, RS (subtropical climate condition), and in the Summer of 2008 and 2009, in São Joaquim, SC (temperate climate condition). It was used a randomized complete block design in a factorial arrangement (33 clones in 5 environments), with two or three replicates of ten hill plots. Yield, appearance, chip color, dry matter and reducing sugar contents of tubers were evaluated. There was a significant interaction between clones and environments for all the evaluated traits, except for chip color. The yield and dry matter of tubers were higher in the summer crop. Environmental conditions affected all the evaluated traits. Growing conditions in Southern Brazil allow for the selection of potato clones with enough content of dry matter to meet the potato processing industry requirements.
Yield performance of 'Royal Gala' and 'Fuji' apple trees subjected to different planting densities and rootstocks [Desempenho produtivo de macieiras 'Royal Gala' e 'Fuji' submetidas a diferentes densidades de plantio e porta-enxertos]
Pereira A.J.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina |
Pasa M.S.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina
Pesquisa Agropecuaria Brasileira | Year: 2016
The objective of this work was to evaluate the effect of planting density and rootstocks on the yield performance of 'Royal Gala' and 'Fuji' apple trees. The experiment was carried out from 1996 to 2007 with the apple cultivars Royal Gala and Fuji, in the São Joaquim region, in the state of Santa Catarina, Brazil. Treatments consisted of two rootstocks (M9 and M26), and three planting densities (1,667, 2,500, and 5,000 plants per hectare), in a 2x3 factorial arrangement, with six treatments for each cultivar. A randomized complete block design was used, with four replicates. Increasing planting densities increases yield and decreases production and number of fruit per tree, regardless of the cultivar. Moreover, higher planting densities reduce tree vigor (expressed by trunk transverse section) and fruit weight. Induced yield by M26 is greather than that by M9, but the latter produces larger fruit, possibly due to the lower crop load of the trees on this rootstock.
Moreira R.R.,Federal University of Paraná |
Nesi C.N.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina |
May De Mio L.L.,Federal University of Paraná
Biological Control | Year: 2014
The control of Glomerella leaf spot (GLS) in Brazil is solely based on fungicide sprays and new alternatives are needed. In apple, few biological control methods have been evaluated, and most have focused on post-harvest pathogens. Therefore, the objectives of this work were to study the mode of action of three bacterial strains and the commercial product Serenade® (Bacillus subtilis) against the Colletotrichum acutatum group, the causal agents of GLS, and to evaluate the influence of bacterial isolates and Serenade® on the development of the first cycle of infection disease under controlled conditions. To assess the mode of action of the bacterial isolates against strains of the C. acutatum group, in vitro tests were performed. It was tested the effect of the bacteria on conidial germination and mycelial growth, using three methodologies, (i) fungal-bacterial co-cultivation, (ii) bacterial thermostable metabolites and (iii) bacterial volatile compounds. The influence of the bacterial isolates on the GLS development was assessed using apple seedlings. The seedlings were first sprayed weekly with bacterial suspension for 5weeks, and were then inoculated with conidia suspensions (104conidiamL-1) of C. acutatum group isolates. Seedlings were maintained in chambers (CONVIRON) at 25°C and a 12-h light regime. Disease severity of GLS was evaluated daily by counting typical lesions caused by C. acutatum group on all leaves during 12 consecutive days. The disease progress curve was fitted to nonlinear models for incidence and severity data. The treatments were compared by contrasting epidemiological parameters. Bacillus sp. isolated from the apple phylloplane inhibited more than 60% of the C. acutatum group conidial germination. The mode of action of Bacillus sp. and Bacillus alcalophilus on the C. acutatum group was through the production of fixed and volatile compounds, which inhibited mycelial growth. The primary mode of action of Serenade® on the C. acutatum group was the production of thermostable metabolites capable of completely inhibiting mycelial growth. In the GLS disease cycle, it was possible to adjust the monomolecular model for incidence and the number of lesions. There were significant differences between the epidemiological parameters of GLS in seedlings treated with apple phylloplane bacteria or with Serenade® as compared to the controls, indicating a potential for the use of biological control to manage GLS in apple orchards. © 2014.
Machado A.C.Z.,Instituto Agronomico Do Parana |
De Araujo Filho J.V.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina
Nematology | Year: 2014
Five pot trials were carried out under glasshouse conditions to assess the host response of some selected rice cultivars to Meloidogyne javanica, M. paranaensis and M. enterolobii, based on nematode reproductive factor (RF) and number of nematodes (g root)-1. We also determined the broad-sense heritability and variance component estimations associated with M. paranaensis and M. incognita resistance. In addition, cluster analysis of cultivars was conducted. All cultivars were rated as susceptible or highly susceptible to M. javanica and highly resistant to M. enterolobii. To M. paranaensis, only cvs IAPAR 177 and BRS Caravela were resistant. From the principal component analysis and Ward's cluster analysis, we obtained four conspicuous clusters of cultivars according to Meloidogyne species resistance, which demonstrates the variability of the genetic material studied. Higher broad-sense heritability values for RF and nematodes (g root)-1 were obtained. Taken together, our findings suggest that improvement of resistance of rice to Meloidogyne species resistance is possible. The implications for management programmes are also discussed. © 2014 Koninklijke Brill NV, Leiden.
Crop yield and nutrient balance influenced by shoot biomass management and pig slurry application [Rendimento de cultura e balanço de nutrients influenciados por manejos da fitomassa e dejetos suínos]
Pandolfo C.M.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina |
da Veiga M.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina
Revista Brasileira de Engenharia Agricola e Ambiental | Year: 2016
Crop systems that export large amounts of nutrients from the farm may require higher doses of animal manure than those needed for grain production. This study aimed to evaluate the yield of crops and to determine the simplified nutrient balance in three management systems of shoot biomass of crops (cover-grain, cover-silage and hay-silage) associated with five fertilization treatments (control, soluble fertilizer and three doses of pig slurry). The experimental design was a split plot, arranged in randomized blocks with four replicates. The management systems of shoot biomass did not affect the yield of the winter pasture, but there was an increase in yield with the application of pig slurry. The summer crops responded differently to fertilization, depending on the purpose for which they were grown, whether for grain or silage. In the three management systems of shoot biomass, there was an excess of Zn and Cu from the application of 25 m3 ha-1; N from 50 m3 ha-1; and P, K and Ca + Mg at the dose of 100 m3 ha-1. © 2016, Departamento de Engenharia Agricola - UFCG/Cnpq. All rights reserved.
Lima E.F.B.,University of Sao Paulo |
Milanez J.M.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina
Neotropical Entomology | Year: 2013
Elixothrips brevisetis (Bagnall), a species exotic to Brazil, is first recorded in the country. Individuals were collected on banana fruits (Musa sp.) (Musaceae) in July 2010 in the municipality of Luís Alves, state of Santa Catarina, causing rusting on the fruit peel in several bunches of bananas. © 2012 Sociedade Entomológica do Brasil.
Thermal and microscopic analysis of biodegradable laminates made from cassava flour, sorbitol and poly (butylene adipate-coterephthalate) PBAT [Análise térmica e microscópica de laminados biodegradáveis obtidos a partir de farinha de mandioca, sorbitol e poli (butileno adipato co-tereftalato) PBAT]
Rett H.T.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina
Acta Scientiarum - Technology | Year: 2013
Blends of biodegradable laminated materials were developed using cassava flour as starch and natural fibers source, sorbitol as a plasticizer and PBAT as a biodegradable polyester. After obtaining pellets from three different formulations, high temperature thermopressure was used to form laminates. The characterization was performed by scanning electron microscopy (SEM) and by differential scanning calorimetry (DSC). The amount of sorbitol for the best extrusion process was 15% (weight/weight) and the formulation of the best homogeneity observed by microscopy was 55:40:15 (flour/sorbitol/PBAT). Although fibers were dispersed throughout the surface in the three treatments, scattered areas of fibers could be found among them. As rates of flour increased, an increase in the melting point of the laminates occurred when compared to pure PBAT.
Giesel A.,Santa Catarina State University |
Boff M.I.C.,Santa Catarina State University |
Boff P.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina
Acta Scientiarum - Agronomy | Year: 2012
The effect of homeopathic preparations on the activities of the leaf-cutting ants Acromyrmex spp. was studied. A field experiment involving ant nests in six experimental areas was performed using a randomised complete block design. Within each block, every ant nest was considered to represent one repetition. The treatments consisted of the following: Belladonna homeopathic preparations of macerated or triturated Acromyrmex spp. adults, homeopathic preparations of macerated or triturated ant nest fungus (Leucoagaricus gongylophorus) collected from Acromyrmex laticeps and Acromyrmex heyeri nests, a homeopathy Belladonna, and dynamised water. All of the homeopathic treatments were tested at the 30 CH (thirtieth centesimal Hahnemannian) dynamisation. An untreated nest served as the control. The total number of ants from each trail was counted, including both those carrying or not-carrying green plant fragments, immediately before the daily homeopathic applications. All of the tested homeopathic preparations, except for the water, significantly reduced the activity level of Acromyrmex spp. The homeopathic preparations of Belladonna and the macerated nosodes of Acromyrmex spp. reduced the activity level of the ants beginning with the sixth day after the first treatment application; the activity level reduction effect lasted more than 20 days after the last application.
do Amarante C.V.T.,Santa Catarina State University |
Argenta L.C.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina |
Basso C.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina |
Suzuki A.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina
Pesquisa Agropecuaria Brasileira | Year: 2012
The objective of this work was to evaluate fruit mineral composition of 'Gala' and 'Fuji' apples from orchards of different growing regions of Southern Brazil. Orchards were evaluated during the period 1991-2007 in various municipalities of the states of Santa Catarina and Rio Grande do Sul, Brazil, grouped into macroregions called Fraiburgo, Vacaria, and São Joaquim. Fruit average contents (in fresh matter) of Ca, K, Mg, N, and P were respectively 47, 1,027, 52, 419, and 116 mg kg -1 for 'Gala', and 41, 1,043, 46, 373, and 116 mg kg -1, for 'Fuji'. The means of the (K+Mg)/Ca and N/Ca ratios were respectively 24 and 9.6 for 'Gala', and 28 and 9.7 for 'Fuji'. 'Gala' and 'Fuji' apples had mean contents of Ca and P above the minimum critical levels (40 and 100 mg kg -1, respectively), while the means of the (K+Mg)/Ca and N/Ca ratios were above the maximum critical levels (30 and 14), which are considered adequate for a better postharvest quality conservation (PQC). Apples from São Joaquim orchards had the highest Ca and P, and the lowest N contents and (K+Mg)/Ca and N/ Ca ratios, regardless of cultivar. The percentage of samples with fruit at high risk of poor PQC was higher for 'Fuji' than for 'Gala', regarding to Ca and P contents, and to (K+Mg)/Ca and N/Ca ratios.