Assessment of the spatial variability in Tall wheatgrass forage using LANDSAT 8 satellite imagery to delineate potential management zones

Little information is available on the degree of within-field variability of potential production of Tall wheatgrass (Thinopyrum ponticum) forage under unirrigated conditions. The aim of this study was to characterize the spatial variability of the accumulated biomass (AB) without nutritional limitations through vegetation indexes, and then use this information to determine potential management zones. A 27-×-27-m grid cell size was chosen and 84 biomass sampling areas (BSA), each 2 m(2) in size, were georeferenced. Nitrogen and phosphorus fertilizers were applied after an initial cut at 3 cm height. At 500 °C day, the AB from each sampling area, was collected and evaluated. The spatial variability of AB was estimated more accurately using the Normalized Difference Vegetation Index (NDVI), calculated from LANDSAT 8 images obtained on 24 November 2014 (NDVInov) and 10 December 2014 (NDVIdec) because the potential AB was highly associated with NDVInov and NDVIdec (r (2) = 0.85 and 0.83, respectively). These models between the potential AB data and NDVI were evaluated by root mean squared error (RMSE) and relative root mean squared error (RRMSE). This last coefficient was 12 and 15 % for NDVInov and NDVIdec, respectively. Potential AB and NDVI spatial correlation were quantified with semivariograms. The spatial dependence of AB was low. Six classes of NDVI were analyzed for comparison, and two management zones (MZ) were established with them. In order to evaluate if the NDVI method allows us to delimit MZ with different attainable yields, the AB estimated for these MZ were compared through an ANOVA test. The potential AB had significant differences among MZ. Based on these findings, it can be concluded that NDVI obtained from LANDSAT 8 images can be reliably used for creating MZ in soils under permanent pastures dominated by Tall wheatgrass.

Qual é a peça que me falta?: um estudo sobre a qualidade das relações amorosas e as competências interpessoais

O amor é uma das emoções mais intensas e transformadoras no ser humano. Por este motivo o presente estudo propôs-se a investigar a qualidade das relações amorosas, tendo em conta o tempo de duração do relacionamento: curto (até 12 meses) e longo (mais de 12 meses), verificando a influência das competências interpessoais e da proximidade assim como do tempo despendido nas redes virtuais a comunicar com o parceiro. A amostra foi constituída por 198 adolescentes e jovens adultos/as portugueses/as com idades entre 16 e 24 anos que mantem uma relação amorosa. A investigação quantitativa utilizou um protocolo constituído pelos instrumentos: Questionário do Relacionamento Amoroso, Escala da Inclusão do Outro no Self e Questionário de Competências Interpessoais. Considerando os resultados obtidos concluiu-se que não existe uma relação entre a qualidade das relações amorosas e o tempo de duração das mesmas. Porém, admite-se que as competências interpessoais interferem preponderantemente na qualidade das relações; ABSTRACT: "What is the missing piece of me?". A study on the quality of love relationships and interpersonal skills. Love is one of the most intense and transforming emotions in humans. For this reason the present study was to investigate the quality of relationships, taking into account the relationship duration: short (up to 12 months) and long (over 12 months), checking the influence of interpersonal skills and proximity as well as the time spent in virtual networks to communicate with the partner. The study sample consisted of 198 Portuguese adolescents and (young) adults aged between 16 and 24 years. The quantitative research used a protocol formed by the instruments: Loving Relationship Questionnaire, Other Inclusion of scale in Self and Interpersonal Skills Questionnaire. Considering the results obtained, it was concluded that, there is a not relationship between quality of relationships and the duration thereof. However, it is assumed that interpersonal skills affect mainly the quality of relations.

ABOVE-GROUND BIOMASS ESTIMATION OF OPUNTIA FICUS-INDICA (L.) MILL. FOR FORAGE CROP IN A MEDITERRANEAN ENVIRONMENT BY USING NON-DESTRUCTIVE METHODS

In marginal lands Opuntia ficus-indica (OFI) could be used as an alternative fruit and forage crop. The plant vigour and the biomass production were evaluated in Portuguese germplasm (15 individuals from 16 ecotypes) by non-destructive methods, 2 years following planting in a marginal soil and dryland conditions. Two Italian cultivars (Gialla and Bianca) were included in the study for comparison purposes. The biomass production and the plant vigour were estimated by measuring the cladodes number and area, and the fresh (FW) and dry weight (DW) per plant. We selected linear models by using the biometric data from 60 cladodes to predict the cladode area, the FW and the DW per plant. Among ecotypes, significant differences were found in the studied biomass-related parameters and several homogeneous groups were established. Four Portuguese ecotypes had higher biomass production than the others, 3.20 Mg ha−1 on average, a value not significantly different to the improved ‘Gialla’ cultivar, which averaged 3.87 Mg ha−1. Those ecotypes could be used to start a breeding program and to deploy material for animal feeding and fruit production.