Absorção de macronutrientes por porta-enxertos e cultivares de videira em hidroponia

A proposta deste trabalho foi detectar a capacidade de absorção de macronutrientes nos porta-enxertos de videira ‘Tropical‘ - IAC 313, ‘Jales‘ - IAC 572, ‘Campinas‘ - IAC 766, ‘Dog Ridge‘, ‘Salt Creek‘ e ‘Harmony‘ de possível utilização para as cultivares Thompson Seedless e Italia. Os porta-enxertos e as produtoras foram propagados por estacas semi-lenhosas com 2 gemas, enraizadas em areia grossa lavada até que o sistema radicular permitisse o transplantio para recipientes de 3L de volume, contendo 2 partes de sílica e 1 parte de areia grossa. As mudas foram uniformizadas através de poda, tanto do sistema radicular quanto da parte aérea. A solução nutritiva foi aplicada por irrigação em sistema fechado de gotejamento, acionado por temporizador. Quando as plantas apresentavam, em média, um ramo com 1,50m de comprimento, foi realizada a poda do sistema aéreo, colocando-se o material para secar. As amostras foram moídas e analisadas quanto ao teor de macronutrientes. A análise dos dados permitiu concluir que: a produção de biomassa apresenta alta correlação com a quantidade acumulada de nutrientes; o porta-enxerto ‘Jales‘ apresentou o maior valor de produção de matéria seca da parte aérea, sendo pois considerado o mais vigoroso, vindo a seguir os porta-enxertos ‘Tropical‘ e ‘Campinas‘; as produtoras ‘Thompson Seedless‘ e ‘Italia‘ e os porta-enxertos ‘Harmony‘, ‘Dog Ridge‘ e ‘Salt Creek‘ apresentaram valores menores de produção de matéria seca da parte aérea, considerados portanto menos vigorosos que os demais materiais estudados; o porta-enxerto ‘Jales‘ foi o que extraiu maior quantidade de N, P, K e Ca, igualando-se ao ‘Tropical‘ na extração de Mg; de modo geral, a extração de N, P, K, Ca e Mg pelas cultivares Thompson Seedless e Italia foi semelhante aos porta-enxertos ‘Campinas‘, ‘Harmony‘, ‘Dog Ridge‘ e ‘Salt Creek‘.<br>The purpose of this study was to evaluate the macronutrient uptake capacity of some rootstocks used for the grape cultivars ‘Thompson Seedless’ and ‘Italia’. The rootstocks ‘Tropical‘ - IAC 313, ‘Jales‘ - IAC 572, ‘Campinas‘ - IAC 766, ‘Dog Ridge‘, ‘Salt Creek‘ and ‘Harmony‘, and the cultivars ‘Thompson Seedless’ and ‘Italia’ were propagated from two bud cuttings, in sand, until root development, being thereafter transplanted to 3L pots with a mixture 2:1 by volume of silica and sand. The young grapevines were pruned to uniformize their size. The growth solution was supplied by a drip irrigation , regulated with a timer. The pruning was made when the grapevine shoots reached 1.50m. The samples were dried and the macronutrients were analyzed. The results indicated that: the biomass yield shows high correlation with the nutrient level; ‘Jales‘ rootstock showed the highest dry matter yield in the aboveground part, being considered the most vigorous, followed by ‘Tropical‘ and ‘Campinas‘; the cultivars ‘Thompson Seedless‘ and ‘Italia‘ and the rootstocks ‘Harmony‘, ‘Dog Ridge‘ and ‘Salt Creek‘ showed the lowest dry matter yield, being considered less vigorous among all; ‘Jales‘ rootstock extracted the higest amount of N, P, K and Ca, and the same amount of Mg as the ‘Tropical‘ rootstock; in a general way, extraction of N, P, K, Ca and Mg by the cultivars ‘Thompson Seedles’ and ‘Italia’ was equivalent to that of the rootstocks ‘Campinas‘, ‘Harmony‘, ‘Dog Ridge‘ and ‘Salt Creek‘

Measurement of production in pp collisions at TeV *

Abstract The production of baryons in proton-proton collisions at a centre-of-mass energy of is measured in the transverse-momentum range and the rapidity range . The data used in this measurement correspond to an integrated luminosity of , recorded by the LHCb experiment during 2016. The ratio of the production cross-section times the branching fraction of the decay relative to the prompt production cross-section is found to be , assuming the central value of the measured lifetime, where the first uncertainty is statistical and the second systematic. </jats:p

Observation of structure in the J/ψ-pair mass spectrum

Using proton-proton collision data at centre-of-mass energies of √s = 8 and 13 TeV recorded by the LHCb experiment at the Large Hadron Collider, corresponding to an integrated luminosity of 9 fb1 , the invariant mass spectrum of J/ψ pairs is studied. A narrow structure around 6.9 GeV=c2 matching the lineshape of a resonance and a broad structure just above twice the J/ψ mass are observed. The deviation of the data from nonresonant J/ψ-pair production is above five standard deviations in the mass region between 6:2 and 7:4 GeV=c2, covering predicted masses of states composed of four charm quarks. The mass and natural width of the narrow X6900 structure are measured assuming a Breit-Wigner lineshape