Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina
Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina
Morales R.A.V.,Conselho Nacional de Desenvolvimento Cientifico e Tecnologico |
de Araujo C.E.S.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina
Revista Brasileira de Meteorologia | Year: 2017
Daily rainfall data from a meteorological network in Southern Brazil is used to assess the performance of two different outliers detection algorithms. Both methods use a statistical and spatial consistency approach based in distance and elevation difference between two rain gauge measurements. A variation of the Multiple Interval Gamma Distribution method of You, Hubbard, Nadarajah e Kunkel (2007) is considered in this study. Neighboring stations data is gathered to get the local average rainfall distribution. The precipitation range of values is partitioned so one makes the assumption that every interval can be modeled by a Gamma distribution. The second method assumes no prior distribution characteristic, and instead uses point spatial and cumulated temporal information from neighboring rain gauge stations to consist daily rainfall data. In order to assess the reliability of the detected outliers, as well the accuracy, seeded errors are introduced in the historical rainfall series. A two dimensional probability model of introduced/detected error (yes-no) is used to compute metrics related to the correct detection and false alarm probabilities made by the algorithm. We verify that the new proposed method overcomes the Multiple Interval Gamma Distribution method. © 2017, Sociedade Brasileira de Meteorologia. All rights reserved.
Pasa M.S.,Empresa de Pesquisa Agropecuaria e Extensao Rural de Santa Catarina |
Einhorn T.,Michigan State University
Pesquisa Agropecuaria Brasileira | Year: 2017
The objective of this work was to evaluate the fruiting and vegetative growth of 'Starkrimson' pear in response to the application of prohexadione calcium (P-Ca). P-Ca (250 mg L-1) was sprayed to scaffold limbs and to whole trees in commercial orchards. A randomized complete block design was used to minimize declivity effects. Vegetative growth (length and number of shoots, increment in limb and trunk cross-sectional area, number of nodes, and internode length), production (fruit number, yield, yield efficiency, and fruit size), and return bloom were evaluated from 2010 to 2013. P-Ca efficiently controlled shoot growth in all growing seasons, when applied early in the season, due to the reduction in internode length. Production was not negatively affected by the application of P-Ca in all years and at both sites, and fruit size and return bloom were not reduced. Fruit quality attributes were also little affected by P-Ca, except for total soluble solids content, which was lower than that of the control. This shows that P-Ca is efficient to manage tree vigor in high-density 'Starkrimson' pear orchards.
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.
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.
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.
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.