977 research outputs found

    Sources of phosphorus on rootstock growth of nursery cultured seringueira

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    O uso de fontes e doses de fósforo podem influenciar o crescimento do porta-enxerto de seringueira. Objetivou-se avaliar os efeitos da aplicação de diferentes fontes de fósforo no crescimento de porta-enxertos de seringueira sob condições de viveiro. Para isso, realizou-se experimento em viveiro telado, em Colina/SP. O delineamento experimental foi em blocos ao acaso, com cinco tratamentos e quatro repetições. Os tratamentos foram constituídos de: 1-testemunha (sem aplicação de P); 2- 2,5 kg de superfosfato simples e 186 g de óxido silicatado por m3 de terra; 3- 5,0 kg de superfosfato simples e 372g de óxido silicatado por m3 de terra; 4- 3,1 kg de termofosfato magnesiano por m3 de terra; 5- 6,2 kg de termofosfato magnesiano por m3 de terra. A parcela foi constituída por cinco sacolas plásticas de dimensões de 20x35cm, contendo uma muda de seringueira (clone Tjair). Ao longo do cultivo do porta-enxerto da seringueira, realizou avaliações do crescimento, a partir do diâmetro do caule a 5 cm do solo e a altura das plantas, durante seis épocas (junho/2008, agosto/2008, outubro/2008, janeiro/2009, março/2009 e maio/2009) de cultivo. A aplicação do fósforo incrementou o crescimento das plantas, durante todo o ciclo de crescimento das mudas de seringueira. Para produção de mudas de seringueira indica-se aplicação do fósforo, seja na forma de termofosfato na dose de 3,1 kg por m3 de terra ou na forma do superfosfato simples na dose de 2,5 kg por m3 de terra.Palavras-chave: Hevea brasiliensis; produção de mudas; desenvolvimento; adubação fosfatada. AbstractSources of phosphorus on rootstock growth of nursery cultured seringueira. The use of phosphorous sources and s levels can influence the growth of rubber tree rootstockr. This research aimed to evaluate the effects of application of different phosphorus sources on growth of rubber tree rootstock  under nursery conditions, int an experiment carried out in a greenhouse located in Colina County, São Paulo State, Brazil. The experimental design was randomized blocks with five treatments and four replications. The treatments consisted of: 1-control (no P application), 2 - 2.5 kg superphosphate and 186 g of silicate oxide per m3 of earth, 3 - 5.0 kg of superphosphate and 372g oxide silicate per m3 of earth, 4 - 3.1 kg of thermophosphate per m3 of earth, from 5 to 6.2 kg of thermophosphate per m3 of earth. The plot consisted of five plastic bags of  20x35cm, containing a  rubber trees seedling (clone Tjair). Evaluations of stem diameter and seedling height growths were carried out during six sesaons (June/2008 to May/2009). Phosphorus application increased the plants growth  throughout the seasons. Application of phosphorous is indicated to the rubber tree seedling production,  either in the form of thermophosphate (3.1 kg per m3 of soil) or in the form of single superphosphate  (2.5 kg per m3 of soil).Keywords: Hevea brasiliensis; seedlings; development; phosphate fertilization and thermophosphate.The use of phosphorous sources and s levels can influence the growth of rubber tree rootstockr. This research aimed to evaluate the effects of application of different phosphorus sources on growth of rubber tree rootstock  under nursery conditions, int an experiment carried out in a greenhouse located in Colina County, São Paulo State, Brazil. The experimental design was randomized blocks with five treatments and four replications. The treatments consisted of: 1-control (no P application), 2 - 2.5 kg superphosphate and 186 g of silicate oxide per m3 of earth, 3 - 5.0 kg of superphosphate and 372g oxide silicate per m3 of earth, 4 - 3.1 kg of thermophosphate per m3 of earth, from 5 to 6.2 kg of thermophosphate per m3 of earth. The plot consisted of five plastic bags of  20x35cm, containing a  rubber trees seedling (clone Tjair). Evaluations of stem diameter and seedling height growths were carried out during six sesaons (June/2008 to May/2009). Phosphorus application increased the plants growth  throughout the seasons. Application of phosphorous is indicated to the rubber tree seedling production,  either in the form of thermophosphate (3.1 kg per m3 of soil) or in the form of single superphosphate  (2.5 kg per m3 of soil)

    AVALIAÇÃO DO ESTADO NUTRICIONAL DE PLANTAS DE COUVE-FLOR CULTIVADAS EM SOLUÇÃO NUTRITIVA SUPRIMIDAS DE MACRONUTRIENTES

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    Com o objetivo de avaliar o efeito da omissão de macronutrientes no crescimento e no estado nutricional da couve-flor, bem como descrever sintomas visuais de deficiência nutricional, foi conduzido um experimento em casa de vegetação, em solução nutritiva. O delineamento experimental foi inteiramente casualizado, com sete tratamentos, que corresponderam à solução completa e à omissão individual de N, P, K, Ca, Mg e S, com três repetições. Foram avaliados a altura das plantas, o número de folhas, a área foliar, a massa seca da parte aérea, das raízes e planta inteira, os teores dos macronutrientes da parte aérea e raízes e descritas as desordens nutricionais. As omissões individuais de N, P, K, Ca e Mg foram as mais limitantes para o crescimento vegetativo da couve-flor, reduzindo consideravelmente a altura, o número de folhas, área foliar, assim como massa seca da parte aérea, raízes e planta inteira. Foram observados sintomas de deficiência nutricional de cada elemento. Os teores dos macronutrientes na parte aérea do tratamento completo e com omissão dos nutrientes foram respectivamente: N = 36,3 – 11,0; P = 5,0 – 1,0; K = 37,0 – 4,7; Ca = 26,0 – 5,7; Mg = 5,3 – 1,0; S = 15 – 3,0 g kg-1.An experiment was conducted under greenhouse conditions, to evaluate the effects of macronutrient omission on cauliflower nutritional status and development, as well as describe nutritional deficiency symptoms. The experiment was arranged in completely randomized design with three replications and seven treatments, corresponding to complete nutritive solution and individual N, P, K, Ca, Mg and S omission. Plant height, number of leaves, leaf area, shoot, root and whole plant dry mass and macronutrient levels were determined and nutritional deficiency symptoms were described. Individual omissions of N, P, K or Ca were the most limiting for cauliflower growth, considerably reducing plant height, number of leaves, and shoot, root and whole plant dry mass. Nutritional deficiency symptoms were observed for each element. Shoot macronutrient levels in control and nutrient omission treatments were, respectively: N = 36.3 – 11.0; P = 5.0 – 1.0; K = 37.0 – 4.7; Ca = 26.0 – 5.7; Mg = 5.3 – 1.0; S = 15.0 – 3.0 g kg-1

    OMISSÃO DE MACRONUTRIENTES NO CRESCIMENTO E NO ESTADO NUTRICIONAL DE CAPIM-ELEFANTE (CV. MOTT) CULTIVADO EM SOLUÇÃO NUTRITIVA

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    The objective of this work was to evaluate the effect of omission of macronutrients in the growth and the nutritional state of elephant-grass plants (Pennisetum purpureum Shum cv. Mott). The experiment was developed in the FCAV/UNESP, in Jaboticabal-SP,Brazil, using nutrient solution. The experimental design was completely randomized blocks, with seven treatments (the complete solution proposed by Hoagland & Arnon (1950) and the individual omission of N, P, K, Ca, Mg and S, in these solution), in three repetitions. Pre-germinated plants were placed in pot (5 dm3), containing the nutrient solution, which was aerated constantly during the experimental period and the respective treatments, with three replications each. Weekly, the height of the plants, the leaf number, apex diameter and number of tillers were evaluated as well as plant nutritional state. The omission of N, P, K, Ca, Mg and S limited the production of dry weight of shoot the elephant grass, compared to the full treatment. The deficiency of a macronutrient, in addition to promoting reduction of its content in the shoot, resulted in reducing the accumulation of most macronutrients, with resultant morphological changes, translated as characteristic symptoms of deficiency.Objetivou-se avaliar o efeito da omissão de macronutrientes no desenvolvimento e no estado nutricional de plantas de capim-elefante (Pennisetum purpureum Shum cv. Mott). O experimento foi desenvolvido na FCAV/UNESP, em Jaboticabal-SP com o uso de solução nutritiva. O delineamento experimental foi inteiramente casualizado, com sete tratamentos (solução completa Hoagland & Arnon (1950) e a omissão individual de N, P, K, Ca, Mg e S nessa solução). Após o brotamento dos colmos, as plantas foram colocadas em vasos (5 dm3), contendo solução nutritiva sob aeração constante, aplicando-se os tratamentos com três repetições cada. Semanalmente, avaliou-se a altura das plantas, o número de folhas, o diâmetro do colmo e número de perfilhos, além do estado nutricional. A omissão de N, P, K, Ca, Mg e S limitaram a produção de massa seca da parte aérea do capim-elefante, em relação ao tratamento completo. A deficiência de um macronutriente, além de promover diminuição do seu teor na parte aérea, resultou em redução da acumulação da maioria dos macronutrientes, com conseqüente alterações morfológicas, traduzidas como sintomas característicos de deficiência

    EFEITO RESIDUAL DE MODOS DE APLICAÇÃO DE ZINCO NA NUTRIÇÃO E NO CRESCIMENTO INICIAL DA CULTURA DO ARROZ

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    Em sistemas de alta produção os micronutrientes, especialmente o zinco é importante para a cultura do arroz. O presente trabalho objetivou avaliar o efeito residual de modos de aplicação de Zn sobre a nutrição e o crescimento inicial de plantas de arroz. O delineamento experimental utilizado foi inteiramente casualizado, com quatro tratamentos, tendo zinco aplicado via foliar, incorporado no solo e nas sementes e a testemunha (sem zinco), em quatro repetições. Aos 42 após a emergência, avaliou-se o teor de Zn no solo e na planta e o crescimento inicial das plantas de arroz . A aplicação de Zn via solo incorporado proporcionou efeito residual no teor do micronutriente no solo. A aplicação de Zn via foliar promoveu maior absorção do nutriente pelas plantas de arroz. Os modos de aplicação de Zn via semente, foliar e solo foram semelhantes em promover o incremento na produção de matéria seca de plantas de arroz

    AVALIAÇÃO DA DESORDEM NUTRICIONAL DE PLANTAS DE AMENDOIM CULTIVADAS EM SOLUÇÃO NUTRITIVA SUPRIMIDAS DE MACRONUTRIENTES

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    Com o objetivo de avaliar o efeito da omissão de macronutrientes no crescimento e no estado nutricional do amendoim (Arachis hypogaea L.), bem como descrever sintomas visuais de deficiência nutricional, foi desenvolvido um experimento em solução nutritiva na FCAV/UNESP. O delineamento experimental foi o inteiramente casualizado, com sete tratamentos, que corresponderam à solução completa e à omissão individual de N, P, K, Ca, Mg e S, com três repetições. As plantas de amendoim cv. Runner IAC 886 foram cultivadas em solução nutritiva de Hoagland & Arnon em vasos contendo 5 dm³. Foram avaliados a altura das plantas, o diâmetro do caule, o número de folhas, o índice SPAD, a massa seca da parte aérea, das raízes e planta inteira, os teores e o acúmulo dos macronutrientes na parte aérea e raízes e a descrição das desordens nutricionais. A omissão de K, Ca, N, P e Mg foram as que mais limitaram o crescimento vegetativo do amendoim, reduzindo consideravelmente a altura, o diâmetro do caule, o número de folhas, assim como a produção da massa seca do amendoim. Foram observados sintomas de deficiência nutricional de cada elemento. Os teores de nutrientes observados nas plantas de amendoim do tratamento completo e da omissão, na parte aérea, foram, respectivamente: N = 19,0 - 12,2; P = 4,7 - 1,1; K = 27,9 - 4,7; Ca = 10,4 - 1,6; Mg = 6,2 - 0,96; S = 1,2 - 0,7 g kg-1

    RENDIMENTO E CRESCIMENTO DA BETERRABA EM FUNÇÃO DA ADUBAÇÃO COM FÓSFORO

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    To evaluate the performance and growth of beet sugar plants, grow Early Wonder, depending on phosphorus levels. The experiment was conducted in a greenhouse on the campus of FCAV-UNESP, Jaboticabal-SP. The experimental design was completely randomized, with four replicates and six treatments, and these comprise the following phosphorus levels: 0, 50, 100, 150, 200 and 400 mg dm-3. During the conduct of the trial was to assess the height and number of leaves, the ten days after transplanting and the end of the cycle (60 days after transplanting) were measured leaf area, the diameter of the tuberous root, the dry mass , the content and accumulation of phosphorus in the plant and content of phosphorus in the soil. The application of phosphorus increased in growth, leaf content of P and the beet. The decline indicated that the dose of 340 mg dm-3, P provided the greatest mass tuberous root, was associated with the concentration of P in the soil, from 54,3 mg dm-3, and with the content of P in the shoots and tuberous root of 4.7 and 2.2 g kg-1, respectively.Com objetivo de avaliar o rendimento e o crescimento das plantas de beterraba, cultivar Early Wonder, em função de doses de fósforo, um experimento foi conduzido em casa de vegetação no campus da FCAV-UNESP, Jaboticabal-SP. O delineamento experimental utilizado foi inteiramente casualizado, com quatro repetições e seis tratamentos, sendo estes compostos pelas seguintes doses de fósforo: 0; 50; 100; 150; 200 e 400 mg dm-3. Durante a condução do experimento, avaliou-se a altura e o número de folhas, a cada dez dias após o transplantio e ao final do ciclo (60 dias após o transplantio) foram avaliados a área foliar, o diâmetro da raiz tuberosa, a massa seca, o teor e o acúmulo de fósforo na planta e o teor de P no solo. A aplicação de fósforo promoveu incremento no crescimento, no teor foliar de P e na produção da beterraba. A regressão indicou que a dose de 340 mg dm-3 de P proporcionou maior massa de raiz tuberosa, esteve associado com a concentração de P no solo, de 54,3 mg dm-3; e com o teor de P na parte aérea e raiz tuberosa de 4,7 e 2,2 g kg-1, respectivamente

    Measurement of nuclear modification factors of gamma(1S)), gamma(2S), and gamma(3S) mesons in PbPb collisions at root s(NN)=5.02 TeV

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    The cross sections for ϒ(1S), ϒ(2S), and ϒ(3S) production in lead-lead (PbPb) and proton-proton (pp) collisions at √sNN = 5.02 TeV have been measured using the CMS detector at the LHC. The nuclear modification factors, RAA, derived from the PbPb-to-pp ratio of yields for each state, are studied as functions of meson rapidity and transverse momentum, as well as PbPb collision centrality. The yields of all three states are found to be significantly suppressed, and compatible with a sequential ordering of the suppression, RAA(ϒ(1S)) > RAA(ϒ(2S)) > RAA(ϒ(3S)). The suppression of ϒ(1S) is larger than that seen at √sNN = 2.76 TeV, although the two are compatible within uncertainties. The upper limit on the RAA of ϒ(3S) integrated over pT, rapidity and centrality is 0.096 at 95% confidence level, which is the strongest suppression observed for a quarkonium state in heavy ion collisions to date. © 2019 The Author(s). Published by Elsevier B.V. This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). Funded by SCOAP3.Peer reviewe

    Electroweak production of two jets in association with a Z boson in proton-proton collisions root s =13 TeV

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    A measurement of the electroweak (EW) production of two jets in association with a Z boson in proton-proton collisions at root s = 13 TeV is presented, based on data recorded in 2016 by the CMS experiment at the LHC corresponding to an integrated luminosity of 35.9 fb(-1). The measurement is performed in the lljj final state with l including electrons and muons, and the jets j corresponding to the quarks produced in the hard interaction. The measured cross section in a kinematic region defined by invariant masses m(ll) > 50 GeV, m(jj) > 120 GeV, and transverse momenta P-Tj > 25 GeV is sigma(EW) (lljj) = 534 +/- 20 (stat) fb (syst) fb, in agreement with leading-order standard model predictions. The final state is also used to perform a search for anomalous trilinear gauge couplings. No evidence is found and limits on anomalous trilinear gauge couplings associated with dimension-six operators are given in the framework of an effective field theory. The corresponding 95% confidence level intervals are -2.6 <cwww/Lambda(2) <2.6 TeV-2 and -8.4 <cw/Lambda(2) <10.1 TeV-2. The additional jet activity of events in a signal-enriched region is also studied, and the measurements are in agreement with predictions.Peer reviewe

    Search for new particles in events with energetic jets and large missing transverse momentum in proton-proton collisions at root s=13 TeV

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    A search is presented for new particles produced at the LHC in proton-proton collisions at root s = 13 TeV, using events with energetic jets and large missing transverse momentum. The analysis is based on a data sample corresponding to an integrated luminosity of 101 fb(-1), collected in 2017-2018 with the CMS detector. Machine learning techniques are used to define separate categories for events with narrow jets from initial-state radiation and events with large-radius jets consistent with a hadronic decay of a W or Z boson. A statistical combination is made with an earlier search based on a data sample of 36 fb(-1), collected in 2016. No significant excess of events is observed with respect to the standard model background expectation determined from control samples in data. The results are interpreted in terms of limits on the branching fraction of an invisible decay of the Higgs boson, as well as constraints on simplified models of dark matter, on first-generation scalar leptoquarks decaying to quarks and neutrinos, and on models with large extra dimensions. Several of the new limits, specifically for spin-1 dark matter mediators, pseudoscalar mediators, colored mediators, and leptoquarks, are the most restrictive to date.Peer reviewe

    Combined searches for the production of supersymmetric top quark partners in proton-proton collisions at root s=13 TeV

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    A combination of searches for top squark pair production using proton-proton collision data at a center-of-mass energy of 13 TeV at the CERN LHC, corresponding to an integrated luminosity of 137 fb(-1) collected by the CMS experiment, is presented. Signatures with at least 2 jets and large missing transverse momentum are categorized into events with 0, 1, or 2 leptons. New results for regions of parameter space where the kinematical properties of top squark pair production and top quark pair production are very similar are presented. Depending on themodel, the combined result excludes a top squarkmass up to 1325 GeV for amassless neutralino, and a neutralinomass up to 700 GeV for a top squarkmass of 1150 GeV. Top squarks with masses from 145 to 295 GeV, for neutralino masses from 0 to 100 GeV, with a mass difference between the top squark and the neutralino in a window of 30 GeV around the mass of the top quark, are excluded for the first time with CMS data. The results of theses searches are also interpreted in an alternative signal model of dark matter production via a spin-0 mediator in association with a top quark pair. Upper limits are set on the cross section for mediator particle masses of up to 420 GeV
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