Search results for "Seed"

Invasive Northern red oaks benefit temnothorax crassispinus (Hymenoptera: Formicidae) ant colonies

2018

Non-native plant species can modify their environment, and their influence on food chains is well recognized. How ever, the phenomenon of non-nutrient dependent interaction between non-native plants and native animals has received little attention to date. The Northern Red Oak (Quercus rubra) is a non-native, invasive tree species in Europe, which strongly negatively influences co-occurring plants. However, a part of the native fauna is able to utilize the resources offered by this species in its non-native range. We studied a common species of wood ant, Temnothorax crassispinus, in forests under canopies of non-native Northern Red Oak and native oaks, Pedunculate Oak (Q. robur), and Sessil…

Index Seminum: annis 2018-2019 collectorum quae

2018

Latvijas Universitātes Botāniskā dārza starptautiskajai sēklu apmaiņai ievākto sēklu saraksts 2018.-2019. gadam. Tajā ir 617 taksoni, tajā skaitā 44, kam sēklas ir ievāktas savvaļā.

Berseem clover (Trifolium alexandrinum L.) seed production in Mediterranean environments.

2013

Effects of harvesting methods on seed yield and quality of Scorpiurs muricatus L..

2009

Scorpiurus muricatus L. is an annual legume, widely distributed in Mediterranean pastures, that is appreciated by farmers for its productivity, forage quality, and palatability. It is characterised by long flowering and ripening periods and by pod shedding. These characteristics cause high seed losses, which could reduce its seed harvest efficiency in terms of seed yield and quality. In this study, we investigated the effects on seed yield and quality of different harvesting methods (windrowing at different times with subsequent combining was compared with direct combining). Our results show that direct combining when the pods were fully ripened reduced pod losses compared with swathing met…

The role of plant-animal and plant-plant interactions in vegetation dynamics and ecological restoration in a Mediterranean landscape

Legacy Effects of Contrasting Long-Term Integrated Weed Management Systems

2022

To reduce reliance on herbicides and maintain crop productivity, integrated weed management (IWM) seeks to optimize synergies between diverse sets of weed management practices combined at the cropping system scale. Nevertheless, data on weed community response to the long-term implementation of IWM practices remain scare. Here, we assessed the effects of four IWM systems with contrasting objectives and practices (S2: transition from superficial tillage to conservation agriculture; S3: no-mechanical weeding; S4: mixed mechanical and chemical weeding; S5: herbicide-free; all with 6 year rotations) compared to a conventional reference (S1: herbicide-based with systematic plowing and a 3 year r…

I-125 seed calibration using the SeedSelectron(®) afterloader: a practical solution to fulfill AAPM-ESTRO recommendations.

2012

Purpose SeedSelectron® v1.26b (Nucletron BV, The Netherlands) is an afterloader system used in prostate interstitial permanent brachytherapy with I-125 selectSeed seeds. It contains a diode array to assay all implanted seeds. Only one or two seeds can be extracted during the surgical procedure and assayed using a well chamber to check the manufacturer air-kerma strength (SK) and to calibrate the diode array. Therefore, it is not feasible to assay 5–10% seeds as required by the AAPM-ESTRO. In this study, we present a practical solution of the SeedSelectron® users to fulfill the AAPM- ESTRO recommendations. Material and methods The method is based on: a) the SourceCheck® well ionization chamb…

Caracterización y germinación de semillas de Genista umbellata (L'Her.) Poir. (LEGUMINOSAE)

2016

Los territorios áridos y semiáridos del SE de la Península ibérica, nos ofrecen algunas especies con un gran atractivo de carácter ornamental. La especie analizada en esta ficha es un buen ejemplo de este hecho. Destaca por su profusa floración primaveral, con flores de un intenso color amarillo e inflorescencias en umbela. Este trabajo se ha cofinanciado por la Generalitat Valenciana (Consellería de Agricultura, Medio Ambiente, Cambio Climático y Desarrollo Rural, Servicio de Biodiversidad) y la Universitat de València.

Propagazione in vitro e produzione di semi sintetici di Metrosoderos excelsa

2009

La nuisibilité directe des adventices en grandes cultures : quelles réponses nous apportent les essais désherbages ?

2016

The direct harmful effect of weeds in field crops : what do herbicide trials tell us ? Weeds are plants whose undesirable qualities (“harmfulness") outweigh their desirable qualities (trophic resources). Few studies conclude that weeds do not affect crop yield. However, it is difficult to generalize since weeds compete with crops for resources and these resources are spatially and temporally variable. This study analyzed 110 herbicide trials (untreated vs. treated plots) performed in France from 1993 to 2015 on three major grain crops: winter wheat, winter oilseed rape and sunflower. Significant yield losses were found in 92% of wheat trials (average over all trials: -2.6 t/ha), 51% of wint…