Gizele Ingrid Gadotti

Qualidade de sementes de couve brócolis beneficiadas em mesa densimétrica

The results of developed research demonstrate the efficiency of the densimetric table in the improvement of the quality of seed lots of diverse species, evidencing superior physiological and sanitary quality of the seeds in the upper positions in relation to the lower positions of the discharge zone. Considering the few reports on the improvement of vegetable seeds, especially borecole broccolis and, moreover the desuniformity of maturation of this species, that is reflected in the specific weight of the seeds, is important to study the influence of the use of the densimetric table on the performance of borecole broccolis seeds. The present study was carried out to verify the physiological and sanitary quality of borecole broccolis seeds, benefited by the densimetric table. The seeds had initially been cleaned in an air machine and sieved and then benefited on the densimetric table. The terminal axle of discharge of the 1.00m wide densimetric table was divided into four parts. The treatments consisted of the fractions obtained in the feed deposit and the high, intermediate high, intermediate decrease and low parts of the discharge zone of the densimetric table. The borecole broccolis seeds unloaded in the high part of the discharge zone of the densimetric table presented significantly superior physiological quality to the seeds unloaded in the lower part, and the intermediate fraction decrease, and the removal of the fraction directed for the part low is recommended to improve the physiological and sanitary attributes of the lot.

An Architectural Model for Situation Awareness in Ubiquitous Computing

One of the major research challenges of Ubiquitous Computing (UbiComp) is related to the need of the applications being aware of the situational context awareness, and when appropriate, respond to it. This paper presents an architecture for situation awareness, called EXEHDA-SA (Execution Environment for Highly Distributed Applications-Situation Awareness). We consider that the main contribution of this work is the architecture that supports acquisition, processing, and dissemination of contextual information, in a distributed way, independently of the application, in an autonomic perspective and rule-based. To assess the functionality of the EXEHDA-SA, we present a case study implemented in Didactic Laboratory of Seed Analysis (LDAS), at Faculty of Agronomy (FAEM), Federal University of Pelotas (UFPel).

Influência da mesa densimétrica na qualidade de sementes de cultivares de tabaco

There is little information available on the cleaning of small seeds, especially in tobacco, where they show significant differences in specific gravity due to maturation differences. The objective of this study was to evaluate the physiological attributes and health of tobacco seeds separated on a densimetric table with independent experiments using the seeds of seven cultivars. The seeds were air cleaned and then separated on the table. The end of the outlet of the 50cm wide table was divided into four sections plus an exit for any stones. The treatments consisted of six fractions: one from the input hopper and four from the top, medium high, medium low and low sections and also one from the outlet for stones. The physiological quality of the tobacco seeds collected from the upper discharging zone of the densimetric table was significantly higher than that of seeds collected from the lower sections. Discarding seeds discharged from the lower part of the table contributes to the improvement of the physiological quality of tobacco seed lots.

Accelerated aging to assess parsley seed vigor

There are many gaps for the assessment of seed vigor in vegetable crops, among these the parsley. In this context, the accelerated aging test is recognized as one of the most widely used to evaluate seed physiological potential of various crop species, being able to provide information with a high degree of consistency. Thus, the objective of the present study was to evaluate the methodology of accelerated aging test to check parsley seed vigor, as well as verify the possibility of using NaCl solutions as an alternative to control seed water uptake during the aging period without reducing test sensitivity. Four lots of parsley seeds were tested for germination, seedling emergence, and accelerated aging for 48, 72 and 96 h (traditional and NaCl solutions). The use of NaCl solutions reduces water uptake by parsley seeds during the accelerated aging test, resulting in less pronounced and drastic deterioration rates and more uniform results. The exposure of the P. sativum seeds for a period of 48 h is a promising option for the evaluation of parsley seed vigor by the accelerated aging test.

Diferentes regulagens da mesa densimétrica na qualidade de sementes de tabaco

O uso da mesa densimetrica pode resultar no aprimoramento da qualidade de sementes de diversas especies, evidenciando superioridade dos atributos de qualidade das sementes coletadas nas posicoes superiores em relacao as posicoes inferiores da zona de descarga da mesa densimetrica. A disponibilidade de informacoes sobre sementes de tabaco, particularmente sobre a acao da mesa densimetrica, nao tem sido contemplada na literatura. O presente trabalho foi realizado com o objetivo de avaliar a influencia de diferentes regulagens na mesa densimetrica sobre a qualidade de sementes de tabaco. O eixo terminal de descarga da mesa densimetrica, com largura de 50 cm, foi dividido em quatro partes mais a bica de saida de pedra. Os tratamentos constituiram-se nas fracoes semente original (obtida no deposito da alimentacao) e sementes pesadas, (parte alta), intermediaria alta, intermediaria baixa e semente leve (baixa) e bica de saida de pedras da zona de descarga da mesa densimetrica. Cada combinacao de regulagens constitui-se em um ajuste independente, totalizando sete ajustes. A mesa densimetrica, nos ajustes com mais alta oscilacao, apresenta eficiencia no aprimoramento da qualidade fisiologica de lotes de sementes de tabaco, pela remocao da fracao descarregada na parte baixa da zona de descarga.

Spatial distribution of the chemical properties of the soil and of soybean yield in the field

The aim of this study was to evaluate the spatial dependence between chemical properties of the soil and yield components in the soybean using precision farming techniques. Samples of the soil and plants were taken from georeferenced points to determine the chemical properties of the soil and the yield components. The results were submitted to Pearson correlation analysis, descriptive statistics and geostatistics. The coefficient of variation showed a wide range of distribution for the chemical attributes of the soil, with the highest indices being found for the levels of available phosphorus (102%) and potassium (72.65%). Soil pH and organic matter showed a coefficient of variation of 5.96 and 15.93% respectively. Semivariogram analysis of the yield components (productivity, 1,000-seed weight and number of seeds) and the chemical properties of the soil (organic matter, pH, phosphorus, potassium, calcium, magnesium, boron, manganese and zinc) fitted the spherical model with moderate spatial dependence, with values ranging from 200 to 700 m. Spatial distribution by means of map interpolation was efficient in evaluating spatial variability, allowing the identification and quantification of regions of low and high productivity in the production area, together with the distribution of soil attributes and their respective levels of availability to the soybean plants.

A distributed model of coordination with dynamic management and support for mobile applications

In Ubiquitous Computing the systems must provide mechanisms to promote the cooperation among users through interoperability of their applications. With this motivation, this paper presents the EXEHDA-TS, which is a distributed mechanism for coordination of applications in Ubiquitous Computing. The proposed software architecture has proactive behavior and allows a dynamic control of communication costs, promoting scalability. The EXEHDA-TS was modeled as an integrated service to the EXEHDA middleware. The prototype was evaluated through case studies in the medical field, considering the challenges inherent in the PERTMED design, satisfactorily fulfilling the requirements of the focused scenarios.

A Contribution to the Sensor Network Management for Context Awareness in Ubicomp

One of the central aspects of Ubiquitous Computing (Ubicomp) is associated with tight integration between computer systems and the environment. In this sense, one of the main research challenges in the area is to provide mechanisms for context awareness that promote the development of applications that respond itself according to the dynamics of the physical environment of users interest. This paper presents the EXEHDA-SN, a software architecture managed by rules that provides the interaction of UbiComp systems with the physical environment by sensors networks and actuators. This work is being developed as part of research efforts related to EXEHDA Middleware. To assess the functionality of the EXEHDA-SN, we present a case study in agricultural area, highlighting the prototypes and tests performed.

CONCEPÇÃO E ANÁLISE ECONÔMICA DE UMA ESTAÇÃO DE EMBALAGEM DE MAÇÃS IN NATURA

O estudo de caso refere-se a uma propriedade rural com 35 ha de pomares, sendo 50% da area plantada com macieiras do grupo Gala e 50% Fuji. O objetivo do presente trabalho foi estudar a viabilidade tecnico-economica da instalacao de uma estacao de beneficiamento e embalagem de maca “in natura, prevendo uma ampliacao, a partir do quarto ano, totalizando 3.000 t.ano -1 . Para o dimensionamento dos equipamentos foi calculado o balanco de massa. Alem disso, foi realizado o planejamento do numero de funcionarios necessarios e de suas funcoes. Para analise de mercado foi realizada uma pesquisa de opiniao, por meios digitais, para pessoas de diferentes cidades do Rio Grande do Sul, de diferentes idades, classes sociais e escolaridade. Quanto ao estudo economico, realizou-se uma analise estrategica para a determinacao da unidade de negocio. Os investimentos foram planejados para ser realizados no ano zero e tres do horizonte de planejamento de 10 anos. Uma vez obtidos todos os valores, elaborou-se o fluxo de caixa. Foram construidos cenarios economicos para simular diferentes situacoes baseadas em acontecimentos de risco, para qualquer producao agricola, neste caso, os fatores climaticos. Conclui-se que em qualquer cenario economico estudado o projeto e viavel e atrativo, ate na pior condicao climatica, pois ainda tem-se um payback pequeno (4 anos) e um alto valor da VPL. A TIR em todos os cenarios e maior que a TMA, indicando que mais vale investir no projeto, a deixar o dinheiro em alguma aplicacao financeira.

Effect of acetic acid on rice seeds coated with rice husk ash

O alagamento do solo para o cultivo do arroz irrigado promove condicoes anaerobias que favorecem a producao de acidos orgânicos de cadeia curta, como o acido acetico, os quais podem ser toxicos para a cultura. O objetivo foi avaliar o efeito do acido acetico em sementes de arroz recobertas com cinzas de casca de arroz. Foi utilizado o delineamento inteiramente casualizado, usando-se o esquema fatorial 2 x 5 x 5, sendo dois cultivares (IRGA 424 e BRS Querencia), cinco doses de recobrimento com cinzas de casca de arroz (0, 2, 3, 4 e 5 g.kg-1 de semente) e cinco concentracoes de acido acetico (0, 3, 6, 9 e 12 mM), totalizando 50 tratamentos com quatro repeticoes. Os testes realizados foram: primeira contagem da germinacao, germinacao, comprimento da parte aerea, comprimento da raiz, fitomassas secas da parte aerea e da raiz. Conclui-se que o recobrimento de sementes de arroz com cinzas de casca de arroz ate 5 g.kg-1 de semente nao influencia o desempenho de sementes de arroz dos cultivares IRGA 424 e BRS Querencia, quando submetidas a concentracoes de acido acetico ate 12 mM. A presenca do acido acetico, em substratos para germinacao de sementes, reduz o vigor e a viabilidade de sementes de arroz dos cultivares IRGA 424 e BRS Querencia, alem de reduzir o desenvolvimento de plântulas, afetando, principalmente, as raizes da BRS Querencia.