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  • 1
    Online Resource
    Online Resource
    Nutrient content affecting Spodoptera frugiperda and Dalbulus maidis occurrence in corn
    Wiley ; 2007
    In:  Insect Science Vol. 14, No. 2 ( 2007-04), p. 117-123
    Details
    In: Insect Science, Wiley, Vol. 14, No. 2 ( 2007-04), p. 117-123
    Abstract: This work aims to study the effect of the nutrient contents in the leaves of corn on the incidence of Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae) and Dalbulus maidis (Delong & Wolcott) (Homoptera: Cicadellidae). The treatments were represented by unfertilized corn plants and corn plants fertilized with 250 kg of the formulation 4‐14‐8 (N‐P‐K) +100 kg of ammonium sulfate (AS)/ha and 500 kg of the formulation 4‐14‐8 (N‐P‐K) +200 kg of AS/ha, arranged in randomized blocks with four replicates. Attacks by S. frugiperda and D. maidis were higher as the nitrogen, sulfur, calcium and copper content in the leaves of corn increased. The effects of calcium and copper found in this study were not consistent with that of lower susceptibility associated with higher levels of these nutrients mentioned in the literature. We believe that there was a cumulative effect of the nutrients altogether, building up a nutritiously better vegetable which in turn had less reserve for defense, or that the content of both nutrients in the leaves were not high enough to induce such effects.
    Type of Medium: Online Resource
    ISSN: 1672-9609 , 1744-7917
    URL: Issue
    URL: Article
    DOI: 10.1111/ins.2007.14.issue-2
    DOI: 10.1111/j.1744-7917.2007.00133.x
    Language: English
    Publisher: Wiley
    Publication Date: 2007
    detail.hit.zdb_id: 2179775-4
    SSG: 12
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  • 2
    Online Resource
    Online Resource
    Produtividade e qualidade do melão cantaloupe, cultivado em ambiente protegido, variando o número e a posição dos frutos na planta
    FapUNIFESP (SciELO) ; 2008
    In:  Bragantia Vol. 67, No. 4 ( 2008-12), p. 911-920
    Details
    In: Bragantia, FapUNIFESP (SciELO), Vol. 67, No. 4 ( 2008-12), p. 911-920
    Abstract: Muskmelon fruits are strong sink affecting assimilate distribution among the plant organs. This experiment aimed at to determine yield and quality of 'Torreon' cultivar in greenhouse conditions as affected by fruit number and position in the plant. A 2 x 2 factorial was set in randomized block design, with five replications. Treatments combined fruit number per plant (1 and 2) and position in the vine (among 5th - 8th node and among 15th - 18th node), planted in 11, 5 dm3 pot with coconut fiber fertilized with macro and micronutrients. Compared to plants with two fruits, in plants with only one fruit there were the highest values of fruits mass (MF), netted rind (RC), fruit length, format index, flesh thickness, maturation index (IM), soluble solids (SS), total soluble sugars and no reducing sugars. Compared to plants with two fruits in plants with one fruit there was a reduction in the commercial productivity (PC) of 21.4% in fruits between 5th and 8th nodes had 24.9% in fruits of 15th and 18th nodes. Fruits of the 15th and 18th nodes presented higher MF, IM, PC and culture cycle, as well as lower RC and total titratable acidity. Positive and significant correlations were obtained for leaf area per fruit (AF) x MF of 0.81, AF x SS of 0.79, MF x SS of 0.68, MF x RC of 0.72 and RC x SS of 0.51.
    Type of Medium: Online Resource
    ISSN: 0006-8705
    URL: Article
    DOI: 10.1590/S0006-87052008000400013
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2008
    detail.hit.zdb_id: 2016147-5
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  • 3
    Online Resource
    Online Resource
    Influência de doses de nitrogênio na produtividade e qualidade do melão Cantalupensis sob ambiente protegido
    FapUNIFESP (SciELO) ; 2007
    In:  Horticultura Brasileira Vol. 25, No. 4 ( 2007-12), p. 550-556
    Details
    In: Horticultura Brasileira, FapUNIFESP (SciELO), Vol. 25, No. 4 ( 2007-12), p. 550-556
    Abstract: Nitrogen promotes morfo-physiologic changes modifying plant growth and development. So, the appropriate management of this nutrient is important, especially under protected environment. The fruit yield and quality of two melon cultivars of the Cantalupensis group (Fleuron and Torreon) were evaluated using five N doses (0; 90; 180; 360 and 540 kg ha-1). A split splot scheme, in randomized blocks design, with four replications was used. The number and foliar area, fruit yield and quality were determined. 'Torreon', compared to 'Fleuron', presented higher leaf number, leaf area, fruit weight, total and commercial yield, fruit length and format index and also presented smaller fruit diameter. Increasing N rates promoted linear increment in the mesocarp thickness, total soluble solids and titratable acidity and lineal decrease in maturation index. The maximum estimated values were 46.6 leaves plant-1, 9364 cm² plant-1 leaf area, 1.3 fruits plant-1, 1083 g fruit-1, 46.50 and 43.73 t ha-1 of total and commercial yield; 15.2 cm of length, 13.3 cm of diameter, 6.1 cm of cavity diameter and 1.15 in the index of fruits format. These values were obtained, respectively, with N rates of: 337, 337, 305, 339, 287, 310, 364, 373, 322 and 359 kg ha-1.
    Type of Medium: Online Resource
    ISSN: 0102-0536
    URL: Article
    DOI: 10.1590/S0102-05362007000400011
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2007
    detail.hit.zdb_id: 2125666-4
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  • 4
    Online Resource
    Online Resource
    Body Fat Equations and Electrical Bioimpedance Values in Prediction of Cardiovascular Risk Factors in Eutrophic and Overweight Adolescents
    Hindawi Limited ; 2013
    In:  International Journal of Endocrinology Vol. 2013 ( 2013), p. 1-10
    Details
    In: International Journal of Endocrinology, Hindawi Limited, Vol. 2013 ( 2013), p. 1-10
    Abstract: The aim of this study was to analyze body fat anthropometric equations and electrical bioimpedance analysis (BIA) in the prediction of cardiovascular risk factors in eutrophic and overweight adolescents. 210 adolescents were divided into eutrophic group (G1) and overweight group (G2). The percentage of body fat (% BF) was estimated using 10 body fat anthropometric equations and 2 BIA. We measured lipid profiles, uric acid, insulin, fasting glucose, homeostasis model assessment-insulin resistance (HOMA-IR), and blood pressure. We found that 76.7% of the adolescents exhibited inadequacy of at least one biochemical parameter or clinical cardiovascular risk. Higher values of triglycerides (TG) ( P = 0.001 ), insulin, and HOMA-IR ( P 〈 0.001 ) were observed in the G2 adolescents. In multivariate linear regression analysis, the % BF from equation (5) was associated with TG, diastolic blood pressure, and insulin in G1. Among the G2 adolescents, the % BF estimated by (5) and (9) was associated with LDL, TG, insulin, and the HOMA-IR. Body fat anthropometric equations were associated with cardiovascular risk factors and should be used to assess the nutritional status of adolescents. In this study, equation (5) was associated with a higher number of cardiovascular risk factors independent of the nutritional status of adolescents.
    Type of Medium: Online Resource
    ISSN: 1687-8337 , 1687-8345
    URL: Article
    DOI: 10.1155/2013/501638
    Language: English
    Publisher: Hindawi Limited
    Publication Date: 2013
    detail.hit.zdb_id: 2502951-4
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  • 5
    Online Resource
    Online Resource
    Aspectos morfofisiológicos das cultivares de cafeeiro Catuaí-Vermelho e Conilon
    FapUNIFESP (SciELO) ; 2001
    In:  Pesquisa Agropecuária Brasileira Vol. 36, No. 3 ( 2001-03), p. 411-416
    Details
    In: Pesquisa Agropecuária Brasileira, FapUNIFESP (SciELO), Vol. 36, No. 3 ( 2001-03), p. 411-416
    Abstract: The objective of this work was to compare plants of the Coffea arabica L. cv. Catuaí-Vermelho and C. canephora Pierre cv. Conilon species in relation to the net photosynthesis rate and aspects of leaf anatomy. Coffea canephora plants presented higher net photosynthetic rate, transpiratory rate and leaf conductance rate than C. arabica plants, which presented smaller photochemical capacity of photosystem I, and shorter and thicker leaves than C. canephora. Both species differed also in relationship to the type, number and dimensions of stomata in the leaf epiderm: they are paracytics in C. arabica and actinocytics in C. canephora, and they are larger, but in smaller number in C. arabica.
    Type of Medium: Online Resource
    ISSN: 0100-204X
    URL: Article
    DOI: 10.1590/S0100-204X2001000300003
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2001
    detail.hit.zdb_id: 2053197-7
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  • 6
    Online Resource
    Online Resource
    Incidência de insetos fitófagos e de predadores no milho e no feijão cultivados em sistema exclusivo e consorciado
    FapUNIFESP (SciELO) ; 2003
    In:  Ciência Rural Vol. 33, No. 3 ( 2003-06), p. 391-397
    Details
    In: Ciência Rural, FapUNIFESP (SciELO), Vol. 33, No. 3 ( 2003-06), p. 391-397
    Abstract: This work was carried out in Coimbra, MG,Brazil, during the agricultural year of 1996/97 and it had the objective of evaluating the phytophagous insects and predators occurrence in maize and bean cultivated in exclusive and policultive systems. One cultivation of maize (from 10/25/1996 to 03/24/1997) and two cultivation of bean were conducted [the first one from 10/25/1996 to 01/20/1997 (rainy period cultivation) and the second one from 03/25/1997 a 07/21/1997 (drought period cultivation)]. The population of phytophagous insects and predators incident in the cultures were counted directly. Lower herbivores population density, which attacks preferentially maize [Dalbulus maidis (Delong & Wolcott) (Homoptera: Cicadellidae) and Spodoptera frugiperda (Smith) (Lepidoptera: Noctuidae)] and bean [Diabrotica speciosa (Germ.), Cerotoma arcuata (Oliv.) (Coleoptera: Chrysomelidae) and Empoasca kraemeri (Ross & Moore) (Homoptera: Cicadellidae)] were associated to the intercropped system. The generalists-insect densities as Thrips tabaci Lind. (Thysanoptera: Thripidae) and Pseudoplusia includens (Walk.) (Lepidoptera: Noctuidae) were higher in the bean intercropped with maize. The phytophagous-insect total number was higher in the bean intercropped with maize in the rainy period cultivation than in the bean cultivated exclusively. The opposite happened in the drought period cultivation. The predators Anthicus sp. (Coleoptera: Anthicidae) and Hymenoptera: Formicidae were more abundant in the maize and bean cultivated exclusively than when the cultures were cultivated intercropped.
    Type of Medium: Online Resource
    ISSN: 0103-8478
    URL: Article
    DOI: 10.1590/S0103-84782003000300001
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2003
    detail.hit.zdb_id: 2025834-3
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  • 7
    Online Resource
    Online Resource
    Índices para avaliar o estado de nitrogênio da batata multiplicada por distintos materiais propagativos
    FapUNIFESP (SciELO) ; 2011
    In:  Revista Ceres Vol. 58, No. 3 ( 2011-06), p. 384-392
    Details
    In: Revista Ceres, FapUNIFESP (SciELO), Vol. 58, No. 3 ( 2011-06), p. 384-392
    Abstract: Improvement in the efficiency of N application can be achieved by synchronizing the plant demand with N supply during the potato cycle. The objective of this study was to determine the optimum values of nitrogen indexes over the cycle of potato grown in a greenhouse, using different propagative materials such as seed tuber, minituber, and sprout tuber, common in the pre-basic seed tuber production. The indexes, determined in the fourth (FL) and the oldest (OL) leaf, were green color intensity, measured by chlorophyll meter and color chart, and agronomic characteristics as leaflet length, width, area and number. Three experiments were carried out in pots in a greenhouse at the University Federal of Viçosa. In each experiment, arranged in a randomized block design with four replications, there was evaluated six nitrogen rates (0, 25, 50, 100, 200 and 400 mg dm-3). The indexes were determined every 10 days, starting 20 days after plant emergence (DAE). With each propagating material, the SPAD index measured in both the FL and the OL responded differently to the increase in N and reached the optimal values of 41.3, 40.5, 37.0, 35.8, 36.0, 31.9 and 29.8 g.kg-1 from 20 to 80 DAE, respectively when seed tuber was used. In all the propagating material, plant age significantly affected all variables except number of stems or the number of leaves, when it is used sprout tuber or minitubers, respectively. Optimum values of variables over the potato cycle depended upon propagation material and time of evaluation.
    Type of Medium: Online Resource
    ISSN: 0034-737X
    URL: Article
    DOI: 10.1590/S0034-737X2011000300020
    Language: Unknown
    Publisher: FapUNIFESP (SciELO)
    Publication Date: 2011
    detail.hit.zdb_id: 2519385-5
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  • 8
    Online Resource
    Online Resource
    Crop growth and macronutrient extraction and export curves for two arrowroot cultivars
    Universidade Estadual de Maringa ; 2023
    In:  Acta Scientiarum. Agronomy Vol. 45 ( 2023-03-20), p. e58132-
    Details
    In: Acta Scientiarum. Agronomy, Universidade Estadual de Maringa, Vol. 45 ( 2023-03-20), p. e58132-
    Abstract: Curves of crop growth and nutrient extraction and export are essential to develop fertilization strategies and management plans to maximize yield and reduce environmental impacts. Our study aimed to evaluate dry matter production and both extraction and export of macronutrients by arrowroots (Maranta arundinacea L.) to be used in further crop fertilization plans. To this purpose, two experiments were carried out in field conditions using the varieties Viçosa and Seta. The experimental design was randomized with four replications and nine periods of analysis, which were defined as days after planting (105, 135, 165, 195, 225, 255, 285, 315, and 345 DAP). Dry matter, extraction, and export of macronutrients by arrowroot seed-rhizomes, aerial parts, roots, and storage roots (rhizomes) were determined. The exports of N, P, K, Ca, Mg, and S of storage rhizomes of the variety Viçosa were 104.6, 51.83, 412.24, 15.85, 36.14, and 64.36 kg ha-1, while those of the seta variety were 160.6, 71.62, 521.31, 17.57, 60.09, and 160.41 kg ha-1, respectively. Both varieties proved to be efficient soil macronutrient extractors, mainly for K. The variety Seta had higher shoot, root, seed-rhizome dry matter contents, as well as greater macronutrient extractions and exports.
    Type of Medium: Online Resource
    ISSN: 1807-8621 , 1679-9275
    URL: Article
    DOI: 10.4025/actasciagron.v45i1.58132
    Language: Unknown
    Publisher: Universidade Estadual de Maringa
    Publication Date: 2023
    detail.hit.zdb_id: 2257087-1
    SSG: 7,36
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  • 9
    Online Resource
    Online Resource
    Seleção de índices para o diagnóstico do estado de nitrogênio de batata-semente básica
    Universidade Estadual de Maringa ; 2011
    In:  Acta Scientiarum. Agronomy Vol. 33, No. 2 ( 2011-04-11)
    Details
    In: Acta Scientiarum. Agronomy, Universidade Estadual de Maringa, Vol. 33, No. 2 ( 2011-04-11)
    Type of Medium: Online Resource
    ISSN: 1807-8621 , 1679-9275
    URL: Article
    DOI: 10.4025/actasciagron.v33i2.5724
    Language: Unknown
    Publisher: Universidade Estadual de Maringa
    Publication Date: 2011
    detail.hit.zdb_id: 2257087-1
    SSG: 7,36
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  • 10
    Online Resource
    Online Resource
    CARACTERIZAÇÃO DAS VIBRAÇÕES MECÂNICAS NO E RUÍDO NO POSTO DE OPERAÇAO NO TRATOR AGRÍCOLA MODIFICADO “TRANSFORMAX”
    Revista Engenharia na Agricultura ; 2016
    In:  REVISTA ENGENHARIA NA AGRICULTURA - REVENG Vol. 24, No. 4 ( 2016-10-11), p. 291-301
    Details
    In: REVISTA ENGENHARIA NA AGRICULTURA - REVENG, Revista Engenharia na Agricultura, Vol. 24, No. 4 ( 2016-10-11), p. 291-301
    Abstract: Os estudos ergonômicos visam adaptar o trabalho ao homem por meio da análise da tarefa, da postura e dos movimentos do trabalhador, assim como de suas exigências físicas e psicológicas, no intuito de reduzir a fadiga e o estresse, proporcionando um posto de trabalho confortável e seguro. Um dos fatores indesejáveis que ocorre em tratores agrícolas é a vibração, não só por causa do desconforto produzido e possível degradação da saúde do operador, mas também por causa do aumento das tensões dinâmicas que podem levar à fadiga e insuficiência dos elementos do trator. Já o ruído excessivo pode causar diminuição ou perda da capacidade auditiva do operador quando o tempo de exposição for muito longo. Dessa forma, objetivou-se, avaliar os níveis de ruído e vibração no posto de operação do trator agrícola modificado Transformax®, em função da força de tração e rotação do eixo motriz, com tipos de rodados, com largura de 13.6 e 18.4. Para esse experimento, foi realizada uma análise de espectro de frequências para todos os tratamentos com intuito de verificar o comportamento das vibrações verticais e longitudinais na base do posto de operação, de acordo com cada faixa de frequência e os níveis de ruído foram determinados com auxílio de um decibelímetro digital, posicionado próximo ao ouvido do operador. As variáveis, força de tração e rotação do eixo motriz, não apresentaram efeito significativo nos níveis de ruído no posto de operação do trator, entretanto, os níveis médio de ruído foram mais elevados no trator quando equipado com pneu 18.4.
    Type of Medium: Online Resource
    ISSN: 2175-6813 , 1414-3984
    URL: Issue
    URL: Article
    DOI: 10.13083/reveng.v24i4
    DOI: 10.13083/reveng.v24i4.684
    Language: Unknown
    Publisher: Revista Engenharia na Agricultura
    Publication Date: 2016
    detail.hit.zdb_id: 2558705-5
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