Instituto de Ciências Agrárias – CRP

URI permanente desta comunidadehttps://locus.ufv.br/handle/123456789/11787

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Resultados da Pesquisa

Agora exibindo 1 - 6 de 6
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    Foliar indices for carrot crop using the compositional nutrient diagnosis method
    (Pesquisa Agropecuária Tropical, 2017-10) Reis, Marcelo Rodrigues dos; Aquino, Leonardo Angelo de; Silva, Frederico Dellano Souza; Silva, Natalia Oliveira; Oliveira, Thaísa Fernanda
    Carrot has a high yield potential, which requires an adequate and adaptable nutritional management, according to the needs and demands of each crop. Foliar diagnosis is a tool for adjustment and constant improvement of crop fertilization programs. This study aimed to determine leaf indices and reference values using the compositional nutrient diagnosis (CND) method, at three phenological stages of carrot crops [40 and 70 days after sowing (DAS) and at harvest]. In order to calculate the CND method, a database was created with leaf contents of the nutrients N, P, K, Ca, Mg, S, B, Cu, Mn and Zn and root yields, in commercial carrot crops. The nutrient limitation order was generated according to the fertilization response potential. At 70 DAS and at harvest, Mg and Mn were the most limiting nutrients by deficiency, while Zn was the most limiting by excess at 70 DAS, and P and Ca were the most limiting by excess at harvest. The results indicate that the foliar diagnosis performed with the CND method is only effective for the correction of nutritional disturbances in subsequent crops.
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    Efeito do tipo de embalagem e do tempo de armazenamento nas qualidades físico-químicas de cenoura minimamente processada
    (The Journal of Engineering and Exact Sciences, 2017-09-20) Miranda, Ana Luiza de Souza; Marques, David Roger Paixão; Passos, Louise Paiva; Oliveira, Isadora Rebouças Nolasco de
    Os minimamente processados são oferecidos aos consumidores de forma a trazer vantagens, pois reduz o tempo de preparação dos alimentos, é uma oferta de produto saudável agregado a qualidade e vem crescendo nos últimos anos em consequência do estilo de vida dos consumidores que tem sofrido transformações. As cenouras foram processadas para obtenção de mini-cenouras, assim este trabalho, teve como objetivo avaliar o efeito da embalagem sob armazenamento de cenoura minimamente processadas. Os produtos foram armazenados nas diferentes embalagens (bandeja de poliestireno com cobertura de policloreto de polivinila (PVC) ou potes de polipropeno) e armazenados sob refrigeração (7oC) por 10 dias. As análises de pH, acidez, sólidos solúveis totais (SST), umidade, perda de massa e carotenoides totais foram realizadas durante o armazenamento. Os resultados mostraram que a acidez inicial foi maior quando comparada com os demais dias e o pH teve uma diminuição ao longo da armazenagem, para ambas as embalagens. A umidade manteve-se próxima a inicial, não tendo diferença entre as embalagens e o tempo. A perda de massa foi similar nas embalagens utilizadas. Os teores de carotenoides e sólidos solúveis obtiveram interação significativa entre o tempo de armazenamento e as embalagens, onde os teores foram maiores ao longo do tempo na embalagem com filme de PVC. Concluiu-se que a embalagem mais apropriada para mini-cenouras foi a bandeja de poliestireno com filme PVC, pois aumentou o teor de carotenoides e sólidos solúveis totais durante o armazenamento e manteve a umidade do produto.
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    DRIS indices in three phenological stages of the carrot crop
    (Pesquisa Agropecuária Tropical, 2017-02) Gonçalves, Felipe Augusto Reis; Aquino, Leonardo Angelo de; Dezordi, Luciel Rauni; Clemente, Junia Maria; Novais, Roberto Ferreira
    Carrot is one of the most consumed vegetables in Brazil, where the cultivars currently grown present a high yield potential and nutritional demand, which require constant adjustments in fertilization programs for the crop. This study aimed at determining reference values ​​and diagnostic indices by using the DRIS method in three phenological stages of the carrot crop (around 40 and 70 days after sowing and at harvest), as well as evaluating the possibility of early diagnosis for nutritional limitations. For determining the DRIS norms, a database was obtained from leaf samplings, root yields and leaf contents of N, P, K, Ca, Mg, S, B, Cu, Mn and Zn, in carrot commercial fields. The nutritional limitation order was generated as a function of the fertilization response and optimum range of leaf contents. The reference values​​ for K, Ca, Mg, S and Mn were similar in all sampling times. N, P, B, Cu and Zn varied with the stages sampled, indicating the need to standardize the sampling times for these nutrients. Mn, K and Mg were the most limiting nutrients for the crop growth, while Zn and B were the least limiting. There was a correlation between the diagnoses performed at early stages and those performed at harvest for K, Ca, Mg, S and Mn, indicating the possibility of early diagnosis for the deficiency of these nutrients.
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    Diagnostic methods to assess the nutritional status of the carrot crop
    (Revista Brasileira de Ciência do Solo, 2015-09-25) Dezordi, Luciel Rauni; Aquino, Leonardo Angelo de; Aquino, Rosiane Filomena Batista de Almeida; Clemente, Junia Maria; Assunção, Natália Silva
    Leaf analysis may identify nutrient deficiency or excess in plant tissue. The aim of this study was to determine reference values and generate nutritional diagnosis from the results of leaf analysis of the carrot crop (Daucus carota L.) by the methods of Critical Level, Sufficiency Range, Diagnosis and Recommendation Integrated System, and Compositional Nutrient Diagnosis. Contents of N, P, K, Ca, Mg, S, B, Cu, Fe, Mn, and Zn were determined in 210 carrot fields in the 2012 and 2013 crop seasons in the Alto Paranaíba region, MG, Brazil. The whole plant shoot was sampled at harvest time to generate reference values for diagnosis. The high yielding subpopulation showed yield higher than 87.8 Mg ha-1. The four diagnostic methods generated similar reference values of nutrients, but different from those found in the literature. Leaf diagnosis through nutrient content in the shoot at harvest time indicated Mn as the most limiting nutrient for growing carrot, followed by Mg, K, and Ca.
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    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 dos
    The 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.
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    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 de
    Farmers 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.