Navegando por Autor "Aquino, Priscila Maria de"
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Item Avaliação de fontes de boro e zinco na sucessão milho-soja-milheto(Universidade Federal de Viçosa, 2018-05-18) Aquino, Priscila Maria de; Mattiello, Edson Márcio; http://lattes.cnpq.br/3986455235005191A presente dissertação trata de estudos relacionados à solubilidade de fertilizantes que contenham B e Zn e suas respectivas performances agronômicas em cultivos em sucessão de milho-soja-milheto. No capítulo 1, conduziu-se ensaio em casa de vegetação no esquema fatorial 2 × (3 × 3 + 1). Foram utilizadas amostras de solo arenoso e argiloso, três fontes de B (H 3 BO 3 , Boráx e ES-B), três doses do nutriente (0,5, 1,0; e 2,0 mg dm -3 de B) e um tratamento controle, sem aplicação de B. Após cada cultivo, foi determinada a matéria seca da parte aérea (MS), o teor foliar de B, o conteúdo foliar de B, a taxa de recuperação de B e a eficiência relativa de absorção de B. O conteúdo de B na planta aumentou linearmente com aplicação do nutriente, para todas as fontes utilizadas. As fontes de B foram igualmente eficiente no suprimento de B para as plantas, não havendo diferenças estatísticas entre elas. A produção de MS foi maior no solo argiloso. No capítulo 2, conduziu-se ensaio em casa de vegetação no esquema fatorial 2 × (3 × 3 + 1). Foram utilizadas amostras de solo arenoso e argiloso, três fontes de Zn (ZnSO 4 , ZnO e ES-Zn), três doses do nutriente (1,5; 3 e 6 mg dm -3 de Zn) e um tratamento controle, sem aplicação de Zn. Não houve efeito das fontes na produção de matéria seca. Houve efeito no teor e conteúdo quando o fertilizante utilizado foi o ZnSO 4. A taxa de recuperação de Zn pelos cultivos foi afetada pelos diferentes fertilizantes, de forma diferenciada nos cultivos. O ZnSO 4 foi mais eficiente que demais fontes no fornecimento de Zn para os cultivos de soja e milho. O ZnO e ES-Zn nos dois primeiros cultivos não incrementaram o conteúdo de Zn com o aumento de suas doses, indicando não ter havido solubilização expressiva destes compostos no solo durante estes cultivos. Por outro lado, no milheto, houve resposta ao aumento da dose de Zn para todos os fertilizantes. Os valores de eficiência relativa de absorção (ERA), considerando a fonte solúvel ZnSO 4 como 100 %, mostram que ao longo do tempo, houve um aumento progressivo na ERA para o fertilizante ES-Zn, em ambos os solos. O uso de fontes de baixa solubulidade mostram-se potencial para o suprimento de Zn a médio e longo prazo, porém a fonte solúvel foi mais eficiente no periodo avaliado .Item Diagnosis of the nutritional status of garlic crops(Revista Brasileira de Ciência do Solo, 2015-11-06) Cunha, Mário Lúcio Pereira; Aquino, Leonardo Angelo; Novais, Roberto Ferreira; Clemente, Junia Maria; Aquino, Priscila Maria de; Oliveira, Thaisa FernandaUnivariate methods for diagnosing nutritional status such as the sufficiency range and the critical level for garlic crops are very susceptible to the effects of dilution and accumulation of nutrients. Therefore, this study aimed to establish bivariate and multivariate norms for this crop using the Diagnosis and Recommendation Integrated System (DRIS) and Nutritional Composition Diagnosis (CND), respectively. The criteria used were nutritional status and the sufficiency range, and then the diagnoses were compared. The study was performed in the region of Alto Paranaíba, MG, Brazil, during the crop seasons 2012 and 2013. Samples comprised 99 commercial fields of garlic, cultivated with the cultivar “Ito” and mostly established in Latossolo Vermelho-Amarelo Distrófico (Oxisol). Copper and K were the nutrients with the highest number of fields diagnosed as limiting by lack (LF) and limiting by excess (LE), respectively. The DRIS method presented greater tendency to diagnose LF, while the CND tended towards LE. The sufficiency range of both methods presented narrow ranges in relation to those suggested by the literature. Moreover, all ranges produced by the CND method provided narrower ranges than the DRIS method. The CND method showed better performance than DRIS in distinguishing crop yield covered by different diagnoses. Turning to the criterion of evaluation, the study found that nutritional status gave a better performance than sufficiency range in terms of distinguishing diagnoses regarding yield.Item Effects of growth regulator and nitrogen on yield and lodging of irrigated wheat(Semina: Ciências Agrárias, 2016-05-10) Nunes, Pedro Henrique Marques Paula; Aquino, Leonardo Angelo de; Xavier, Felipe Oliveira; Santos, Luiz Paulo Dornelas dos; Machado, Lucas Gonçalves; Aquino, Priscila Maria deHigh rates of nitrogen (N) increase plant growth, which can result in lodging. To avoid excessive growth of plants, plant growth regulators (PGRs), which cause internode length reduction, can be used. In this study, our objective was to evaluate the N nutritional status, growth, and yield of irrigated wheat as parameters using variable rates of nitrogen and growth regulator. Two experiments were conducted in Rio Paranaíba – MG in 2011 and 2012 using the BRS 264 cultivar. The treatments consisted of two concentrations of N (50 and 110 kg ha^ -1 as urea) and five concentrations of the growth regulator trinexapac-ethyl (0, 0.2, 0.4, 0.6, and 0.8 L ha^ -1 of Moddus ® containing 25% w/v of trinexapac-ethyl). Each plot consisted of 20 rows of wheat spaced 0.17 m, six meters in length. We evaluated plant height, shoot dry matter accumulation, thousand-grain weight, number of grains per spike, yield, leaf N content in the index leaf and grain, amount of N uptake and export, and lodging index. The PGR resulted in a linear decrease in plant height and shoot dry matter production. However, the rates of the growth regulator did not affect productivity. The rates of N influenced the yield only in 2011.Item Nutrient demand by the carrot crop is influenced by the cultivar(Revista Brasileira de Ciência do Solo, 2014-12-02) Aquino, Rosiane Filomena Batista Almeida; Assunção, Natália Silva; Aquino, Leonardo Angelo; Aquino, Priscila Maria de; Oliveira, Guilherme Anthony de; Carvalho, André Mundstock Xavier deFarmers must carefully choose the cultivar to be grown for a successful carrot crop. The yield potential of the cultivar may influence nutrient demand and should be known to plan for fertilization application. The aim of this study was to evaluate the cultivar effect on carrot yield and on the nutrient content and quantities allocated to leaves and roots. Three experiments were set up in two crop seasons in Rio Paranaíba, MG, Brazil. In the first season, typical summer, 10 summer cultivars were sown. In the second season, summer-winter (transition), two experiments were set up, one with summer cultivars and the other with winter cultivars. The treatments consisted of the carrot cultivars distributed in randomized blocks with four replications. Fresh and dry matter of the roots and leaves was quantified. Yield was calculated based on fresh matter of the roots. The nutrient content in leaves and roots was determined at the time of harvest. These contents and the dry matter production of roots and leaves were used to calculate nutrient uptake and export. The greatest average for total and commercial yield occurred in the crop under summer conditions. Extraction of N and K for most of the cultivars in the three experiments went beyond the amounts applied through fertilizers. Thus, there was contribution of nutrients from the soil to obtain the yields observed. However, the amount of P taken up was considerably less than that applied. This implies that soil P fertility will increase after cropping. The crop season and the cultivars influenced yield, nutrient content in the leaves and roots, and extraction and export of nutrients by the carrot crop.Item Nutrient recommendation model for carrot crop – ferticalc carrot(Revista Brasileira de Ciência do Solo, 2015-08-18) Dezordi, Luciel Rauni; Aquino, Leonardo Angelo de; Novais, Roberto Ferreira; Aquino, Priscila Maria de; Santos, Luiz Paulo Dornelas dosThe literature on fertilization for carrot growing usually recommends nutrient application rates for yield expectations lower than the yields currently obtained. Moreover, the recommendation only considers the results of soil chemical analysis and does not include effects such as crop residues or variations in yield levels. The aim of this study was to propose a fertilizer recommendation system for carrot cultivation (FERTICALC Carrot) which includes consideration of the nutrient supply by crop residues, variation in intended yield, soil chemical properties, and the growing season (winter or summer). To obtain the data necessary for modeling nutritional requirements, 210 carrot production stands were sampled in the region of Alto Paranaíba, State of Minas Gerais, Brazil. The dry matter content of the roots, the coefficient of biological utilization of nutrients in the roots, and the nutrient harvest index for summer and winter crops were determined for these samples. To model the nutrient supply by the soil, the literature was surveyed in regard to this theme. A modeling system was developed for recommendation of macronutrients and B. For cationic micronutrients, the system only reports crop nutrient export and extraction. The FERTICALC which was developed proved to be efficient for fertilizer recommendation for carrot cultivation. Advantages in relation to official fertilizer recommendation tables are continuous variation of nutrient application rates in accordance with soil properties and in accordance with data regarding the extraction efficiency of modern, higher yielding cultivars.