Evaluación del crecimiento y desarrollo de dos variedades de lechuga provenientes de semilla nacional e importada

En el segundo semestre del año 1991, se realizó un trabajo de campo en el Centro Nacional de Investigaciones Agropecuarias (ICA, Tibaitatá), para estudiar el efecto del origen de las semillas en el crecimiento vegetativo y el rendimiento de dos variedades de lechuga: Great Lakes 118 y Climax, utilizando semillas importadas y producidas en condiciones de invernadero en la Sabana de Bogotá. Para el estudio, se utilizó un diseño de bloques al azar, cuatro tratamientos (dos variedades y dos procedencias de las semillas) y tres replicaciones; las variables evaluadas fueron: número de hojas, área foliar, y pesos verde y seco. El área foliar midió 12.751 cm2 para la variedad Climax con semilla importada; 10.813 cm2 para la misma variedad con semilla nacional; 12.335 cm2 para la variedad Great Lakes con semilla importada y 9.790 cm2 para la misma variedad con semilla nacional. Los rendimientos en peso fresco fueron de 968,75 gr para la variedad Climax con semilla importada; 619,64 gr para la misma variedad con semilla nacional; 742,20 gr para la variedad Great Lakes con semilla importada y 568,30 gr. para la misma variedad con semilla nacional.This study was conducted during the second growing cycle of 1991 at Tibaitatá Research Center, to examine the influence of seed source on vegetative growth and yield of two lettuce varieties, Great Lakes and Climax. Seed was either imported or locally produced under greenhouse conditions. The study was carried out using RCB design, four treatments (two varieties x two seeds sources) and three replications. Variables assessed were number of leaves, leaf area and fresh and dry weight. Leafarea was 12,751 crnsfor cv, Climaxwith imported seed; 10,813 cm2 for the same cv. using locally produced seed; 12,335 cm2 for cv. Great Lakes with imported seed and 9,790 cm2 for the same cv. woith local seed.Fresh weight yields were 968.75 gr for cv. Climaxwith imported seed; 619.4 grforthe same cv. using locally produced seed; 742.2 gr for cv. Great Lakes with imported seed; and 568.3 gr. for the same cv. using locallyproduced seed

Análisis de crecimiento de cuatro materiales de lechuga (Lactuca sativa) Growth analysis of four lettuce varieties (Lactuca sativa)

Para estudiar los índices de crecimiento Tasa relativa de crecimiento (TRC), Tasa de asimilación neta (TAN), relación área/peso (RAF), índice de área foliar (IAF) y Tasa de crecimiento de cultivo (TCC) en plantas de lechuga, procedentes de semilla producida en condiciones de invernadero en la Sabana de Bogotá y de semilla importada, de las variedades Great Lakes 118 y Clímax, se realizó un trabajo de campo en el Centro de  Investigaciones Agropecuarias de Tibaitata (Cundinamarca) durante el segundo semestre del año 1991.<br /><br /><br />Growth indices: Relative Growth Rate (RGR), Net Assimilation Rate (NAR), Areaweight Relation (LAR), Leaf Area Index (LAI) and Crop Growth Rate (CGR) were studied using locally produced and imported seed of Great Lakes 118 and Climax. Field work took place at Tibaitata Research Center during the second semester of 1991

Análisis de crecimiento de cuatro materiales de lechuga (lactuca sativa)

Para estudiar los índices de crecimiento Tasa relativa de crecimiento (TRC), Tasa de asimilación neta (TAN), relación área/peso (RAF), índice de área foliar (IAF) y Tasa de crecimiento de cultivo (TCC) en plantas de lechuga, procedentes de semilla producida en condiciones de invernadero en la Sabana de Bogotá y de semilla importada, de las variedades Great Lakes 118 y Clímax, se realizó un trabajo de campo en el Centro de  Investigaciones Agropecuarias de Tibaitata (Cundinamarca) durante el segundo semestre del año 1991.Growth indices: Relative Growth Rate (RGR), Net Assimilation Rate (NAR), Areaweight Relation (LAR), Leaf Area Index (LAI) and Crop Growth Rate (CGR) were studied using locally produced and imported seed of Great Lakes 118 and Climax. Field work took place at Tibaitata Research Center during the second semester of 1991

Measurement of pseudorapidity distributions of charged particles in proton-proton collisions at sqrt(s) = 8 TeV by the CMS and TOTEM experiments

Pseudorapidity ( $\eta$ ) distributions of charged particles produced in proton–proton collisions at a centre-of-mass energy of 8 $~\text {TeV}$ are measured in the ranges $|\eta | < 2.2$ and $5.3 < |\eta | < 6.4$ covered by the CMS and TOTEM detectors, respectively. The data correspond to an integrated luminosity of $\mathcal {L} = 45 \mu {\mathrm {b}}^{-1}$ . Measurements are presented for three event categories. The most inclusive category is sensitive to 91–96 % of the total inelastic proton–proton cross section. The other two categories are disjoint subsets of the inclusive sample that are either enhanced or depleted in single diffractive dissociation events. The data are compared to models used to describe high-energy hadronic interactions. None of the models considered provide a consistent description of the measured distributions

Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at s\sqrt{s} = 7 TeV

The energy calibration and resolution of the electromagnetic calorimeter (ECAL) of the CMS detector have been determined using proton-proton collision data from LHC operation in 2010 and 2011 at a centre-of-mass energy of sqrt(s)=7 TeV with integrated luminosities of about 5 inverse femtobarns. Crucial aspects of detector operation, such as the environmental stability, alignment, and synchronization, are presented. The in-situ calibration procedures are discussed in detail and include the maintenance of the calibration in the challenging radiation environment inside the CMS detector. The energy resolution for electrons from Z-boson decays is better than 2% in the central region of the ECAL barrel (for pseudorapidity abs(eta)<0.8) and is 2-5% elsewhere. The derived energy resolution for photons from 125 GeV Higgs boson decays varies across the barrel from 1.1% to 2.6% and from 2.2% to 5% in the entraps. The calibration of the absolute energy is determined from Z to e+e- decays to a precision of 0.4% in the barrel and 0.8% in the endcaps