Lokalmeteorologiska förhållanden i Västra Ängby, Knivsta : förstudie /

<p>Variation of pollen beetle abundance along within-field (A) and between-field (B) transects as a function of distance (km) to woodland edges. (A) Number of pollen beetles per sampling point within two different OSR fields (fields in complex site, C). (B) Mean number of pollen beetles per field in three transects (in zones S, for simple landscape, and HC, for highly complex landscape). Abundance were measured on 10 OSR plants at each sampling point during three (A) or four (B) consecutive weeks (dates 1 to 4). Trans: Transect.</p

Fatores que Influenciam a Compra de Produtos Têxteis Oficiais por Torcedores de Futebol de Baixa Renda

<p>Este estudo tem como objetivo identificar os principais fatores que influenciam os torcedores de baixa renda a adquirirem produtos têxteis oficiais e licenciados por um clube da elite do futebol brasileiro, aparentemente inviáveis para sua capacidade de compra. A revisão de literatura abordou o marketing no futebol brasileiro, incluindo o torcedor de futebol, licenciamento da marca, consumidores de baixa renda e artigos esportivos têxteis. Para identificarmos os principais fatores foi escolhido o método de análise conjunta, técnica estatística à qual ajuda a entender a complexidade do processo de escolha e decisão de compra dos consumidores. Foram realizadas entrevistas em profundidade com torcedores, lojistas, vendedores e pessoas com atuação no mercado esportivo. Os atributos selecionados para a análise conjunta foram preço, forma de pagamento, durabilidade e ajudar, ou não, o Clube. A pesquisa foi respondida por 149 torcedores durante a realização de dois jogos do Campeonato Brasileiro de 2012. Os resultados da análise conjunta sugerem que os principais fatores, ou atributos, que influenciam os torcedores no processo de compra são, em ordem de importância relativa, ajudar o clube, como mais importante, preço, forma de pagamento e, como menos importante, a durabilidade do produto.</p><p><strong>DOI: 10.5585/podium.v2i2.44</strong></p

Undersowing winter oilseed rape with frost-sensitive legume living mulch: consequences for cash crop nitrogen nutrition

The use of legume cover crops as green manure is often seen as an effective means of supplying nitrogen to the following crop. As winter oilseed rape requires a large amount of N in the spring, the introduction of frost-sensitive legume living mulch (killed off during the winter) is a promising way of decreasing mineral N fertiliser inputs. The aim of this study was to assess the supply of biological N to rape during the spring from several frost-sensitive legumes, grown as intercropped living mulches. We carried out a field trial over two growing seasons before sowing, comparing seven legume species and three legume mixtures intercropped with rape, and two levels of soil mineral N. The presence of legumes, living during the autumn and dead during the spring, resulted in 20-40 kgN ha(-1) more nitrogen uptake in oilseed rape, by the end of flowering, compared to rape grown as a sole crop. Moreover, the use of N-15-labelled nitrogen fertiliser showed that this increase in rape N accumulation was due to the mineralisation of legume residues, but also to other mechanisms such as increase in fertiliser-N recovery and in soil organic matter mineralisation. (C) 2016 Elsevier B.V. All rights reserved

Assessment of the benefits of frost-sensitive companion plants in winter rapeseed

International audienceThe intercropping of rapeseed with frost-sensitive companion plants (CP) has recently been proposed as a way to mitigate the negative environmental impact of rapeseed crops. Using mixed-effect linear models, we compared the yield and weed amounts of rapeseed intercropped with different CP species with that of rapeseed as a sole crop in an unique dataset of 79 field experiments covering a wide range of climate, soil and practices conditions in the northwestern part of France, from 2009 to 2015. Bayesian model averaging procedure was used to determine the relative contributions of sites characteristics to the effects of intercropping.& para;& para;Before winter, field pea and faba bean had accumulated the largest amounts of dry mass, with more than 100 g m(-2). Rapeseed biomass was reduced by 56% by non-legume CPs and by only 18% by legume CPs, the largest decrease being caused by pea. Non-legumes decreased the nitrogen nutrition index of rapeseed by 7%, whereas pea and faba bean increased this index by 6% and 3%, respectively. Intercropping with non-legume and legume CPs reduced weed amounts by 52% and 38% respectively, with no difference between CP species. Non legume CPs decreased rapeseed yield at harvest by 0.581 ha(-1), whereas faba bean and faba bean + lentil in creased yield by 0.16 and 0.12 t ha(-1) respectively, when fertilized at the recommended rate. Intercropping with faba bean, lentil or a mixture of both made it possible to reduce nitrogen applications by 30-40 kg ha(-1) with no significant decrease in rapeseed yield. Faba bean and faba bean + lentil mixtures had the best overall performance. This work suggests that intercropping rapeseed is promising, particularly in soils with low nitrogen content with an early sowing date in the late summer

Observatoire de parcelles agricoles pour évaluer la diversité des adventices dans des légumineuses et les blés suivants

Les adventices se sont avérées être le principal facteur limitant du rendement des légumineuses et des blés suivants dans un observatoire de parcelles agricoles en Bourgogne-Franche-Comté. L’objectif de notre étude était (i) de caractériser l’effet de la légumineuse (pois de printemps / luzerne) et de sa conduite (conventionnelle / biologique) sur la flore adventice, et (ii) d’évaluer l’effet précédent des légumineuses sur la culture suivante (blé). Nous considérons ici la diversité fonctionnelle des adventices pour comprendre leurs réponses aux pratiques agricoles et identifier des leviers de gestion dans le but de les réguler, mais aussi de préserver une biodiversité non nuisible associée aux cultures. Il existe peu de différences d’abondance et de diversité d’adventices entre la luzerne biologique et conventionnelle alors que pour le pois de printemps, les indices sont en général plus faibles en conduite conventionnelle. Il existe une nette distinction de la flore adventice entre les luzernes et les pois, avec une diversité floristique plus importante en conduite biologique pour les deux légumineuses. La conduite des blés suivants a plus d’impact que la légumineuse précédente sur la composition de la flore adventice, même si on observe une proximité entre les précédents légumineuse et les blés suivants. Enfin, pour le pois, c’est plutôt le travail du sol qui impacte l’abondance des groupes fonctionnels d’adventices, plus que l’indicateur de fréquence de traitements herbicide (IFT).Weeds have been found to be the main limiting factor for the yield of legumes and the following wheat in a farmers’ field observatory in Burgundy. The aim of our study was (i) to characterize the effect of legumes (spring pea/alfalfa) and their crop management (conventional/organic) on weed flora, and (ii) to evaluate the previous effect of legumes on the following crop (wheat). Here we consider the weed functional diversity to understand their response to agricultural practices and identify agronomic levers in order to regulate them, but also to preserve non-harmful biodiversity associated with crops. There are few differences in abundance and diversity of weeds between organic and conventional alfalfa, while for peas, the indices are generally lower in conventional. There is a clear distinction in weed flora between alfalfa and peas, with a higher floral diversity in organic management for both legumes. The crop management has a greater impact than the previous legume on the weed flora composition of the following wheat, even if there is a proximity between the previous legumes and the following wheat. Finally, for peas, tillage impacts the abundance of weed functional groups more than herbicide TFI