RESUMOVários testes de vigor são utilizados atualmente pelas empresas produtoras de sementes para avaliar a qualidade dos lotes. Entretanto, nem sempre esses testes se relacionam com a emergência de plântulas no campo e possuem desvantagens, como a demora na obtenção de resultados. O trabalho teve o objetivo de avaliar a eficiência da atividade respiratória como teste de vigor em sementes de algodão. Os experimentos foram conduzidos no ano de 2012, em laboratório e em casa de vegetação. Foram utilizadas sementes da cultivar BRS 286. De um lote principal foram obtidos três lotes por meio de envelhecimento acelerado por zero, 48 e 96 h. Além da atividade respiratória foram realizados, também, testes de germinação, emergência em areia, índice de velocidade de emergência, comprimento da parte aérea e raiz, massa da matéria seca da parte aérea e de raiz e condutividade elétrica. A atividade respiratória diferenciou os três lotes em termos de vigor e apresentou correlação positiva com os testes de comprimento de parte aérea e comprimento de raiz. A avaliação da atividade respiratória é eficiente como teste de vigor em sementes de algodão. Palavras-chave: controle de qualidade, Gossypium hirsutum L., qualidade fisiológica, teste de Pettenkofer Respiratory activity as a vigor test for cotton seed ABSTRACTA high number of vigor tests are currently used by seed companies to evaluate the quality of seed lots. However, some of them do not always correlate with seedling performance in the field and in addition there is the disadvantage of long time interval to obtain the results. This study aimed to evaluate the efficiency of respiratory activity as a vigor test in cotton seeds. The experiments were conducted in 2012 in the laboratory and in a greenhouse. The seed of the cultivar BRS 286 was used. From the principal seed lot, three seed lots were obtained by accelerated aging for periods of zero, 48 and 96 hours. Besides the determination of respiratory activity, seed germination, seedling emergence in sand, emergence speed index, shoot and root length, dry mass of shoots and roots and electrical conductivity tests were performed. The respiratory activity classified the seed lots into three vigor levels, and was positively correlated with shoot and root length. The assessment of respiratory activity is effective as a vigor test for cotton seed.
The forage is all food consumed by animals (grasses and legumes), the most important component in the diet of ruminants, is through the ingestion of dry matter forage that essential nutrients, carbohydrates, proteins, lipids, vitamins and minerals, are metabolised in the gastric intestinal tract and absorbed into the bloodstream through chemical and physiological mechanisms at the level of the digestive system of ruminants. Thus, it is necessary to adopt the properties for animal production management of pasture, it is through dry matter intake pasture, the animals can maximize their productive and reproductive performance. Poorly managed pastures do not provide nutrients in quantity and quality throughout the year for the animals. The methods used for the grazing system are: intermittent grazing, strip grazing, deferred grazing and grazing limit. Therefore, aimed to address the different methods used at the level of research and extension, through production of dry matter measurements of tropical forages
The aim of this study was to evaluate the effect of different seed coatings consisting of various combinations of three nutrients (calcium, magnesium and silicon) on two soybean cultivars (BRS 243 RR and CD 233 RR
Maize is an important food staple in many countries, and is useful in animal feed and many industrial applications. Its productivity is highly sensitive to drought stress, which may occur at any period during its growth cycle. The objective of this work was to compare the water stress influence on the performance of different maize genotypes in critical vegetative stages. Four genotypes of maize (namely a single-cross hybrid (AG 9045), a double-cross hybrid (AG 9011), a triple-cross hybrid (AG 5011), and a variety (AL Bandeirante)) were subjected to a 10-day period without irrigation in the vegetative stages that determine the number of kernel rows and the plant’s ability to take up nutrients and water (V4, V6 and V8). The impact of low water availability was assessed by analyzing plant height, height of the first ear insertion, stem diameter, yield per plant, and number of rows per ear, evincing that the yield per plant was the most sensitive parameter in all the stages. With regard to the influence of the genotype, the single-cross hybrid was demonstrated to be the most resilient to water shortage.
RESUMO.Os ensaios sobre sistema de pastejo são necessários para o melhor entendimento das variáveis estudadas, mais são sem dúvidas, os mais complexos da experimentação zootécnica por envolver dados referentes ao solo-planta-animal, os quais contribuem para aumentar a possibilidade de obter erros nessa categoria de experimentação. Os princípios básicos da experimentação são adotados quando estabelecemos quais os delineamentos serão aplicados no experimento, estes são classificados como: repetição, casualização e controle local. Os experimentos com pastagens geralmente envolvem grandes áreas, o que diminui a precisão dos dados avaliados, sendo recomendo, muita atenção no planejamento prévio do experimento, o qual requer maior atenção e dedicação de raciocínio, tendo, que fazer uma análise aprofundada dos objetivos que pretendem alcançar e as hipóteses a serem testadas. Desta forma, objetivou-se demonstrar os procedimentos básicos para condução de ensaios experimentais sobre pastejo, enfatizando os desenhos e alocação dos mesmos, em função dos delineamentos experimentais pré-estabelecidos.Palavra chave: Delineamento, hipótese, unidades experimentais Experiment planning a pasture: Review Abstract. Tests on grazing system are necessary for better understanding of the variables studied, most are undoubtedly the most complex of zootechnical trial by involving data on the soil-plant-animal, which contribute to increase the possibility of getting errors in this category experimentation. The basic principles of experimentation are adopted when established which designs will be used in the experiment, which are classified as: repetition, randomization and local control. The experiments with pasture often involve large areas, which reduces the accuracy of data collected, and recommend, much attention in the prior planning of the experiment, which requires more attention and dedication of reasoning, having to do a thorough analysis of objectives that aim achieve and the hypotheses to be tested. Thus, it aimed to demonstrate the basic procedures for conducting experimental tests on grazing, emphasizing the design and allocation thereof, on the basis of pre-established experimental designs. Keywords: Design, hypothesis, experimental units IntroduçãoOs ensaios sobre sistema de pastejo são necessários para o melhor entendimento das variáveis estudadas, mas, são sem dúvidas, os mais complexos da experimentação zootécnica por envolver dados referentes ao solo-plantaanimal, os quais contribuem para aumentar a possibilidade de obterem erros nessa categoria de experimentação.
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