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Review "goedkoop en milieuvriendelijk melken" = Review "cost-efficient and environmentally friendly production of milk"
No full textUit een beknopte review van een Belgisch rapport over de toepassing van klaver wordt geconcludeerd dat klaver geen alternatief is voor eiwitrijke krachtvoeders in Nederland, bij de huidige intensiteit van de melkveehouderi
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Grootschalig, maar dan anders
No full textDrie ‘netwerkregisseurs’ begeleiden en ondersteunen de boeren voor het ambitieuze project ‘Echt Overijssel!’. De drie initiatiefnemers van het project, Wageningen UR Livestock Research, Vereniging Natuurmonumenten en Stichting Dianthus/VechtdalProducten willen gesloten kringlopen van boer/producent, regio, consument en natuur opzetten waarvan alles en iedereen profiteert
White clover dynamics in New Zealand pastures
No full textThe study presented in this thesis is based on the overall target of increased herbage production in cooler times of the year, through the use of fertiliser N, while maintaining the benefits of white clover ( Trifolium repens L.) in New Zealand pastures. To help identify management strategies and plant breeding goals to attain this target, seasonal dynamics in cattle grazed pastures of clover population and plant structure and stolon dynamics were studied, including the effects of fertiliser N applications, grazing management and their interactions. The grazing treatments applied were continuous stocking with 4.9 Friesian bulls/ha and rotational grazing with either 4.9 or 7.4 bulls/ha. Fertiliser N (urea) was applied in mid autumn and late winter, at 50 kg N/ha per dressing.Average total herbage dry matter accumulation was about 16 tonnes/ha/year. The average efficiency of the applied fertiliser N was 17.5 kg DM/kg N in 1991 and 12.9 kg DM/kg N in 1992. The grazing treatments applied did not result in great differences in herbage accumulation or composition, and clover was maintained under all grazing treatments. Fertiliser N tended to decrease clover DM accumulation by 15% and clover content by 3.6%.Stolon growth dynamics and structures of populations and plants showed great seasonal variation. Growth was related positively to average soil temperature at 10 cm depth, which explained the greatest part of the variation for most growth parameters. Rooting was not related to temperature, rainfall, distribution of rainfall nor radiation.Continuous stocking during the cooler periods of the year, shifting to rotational grazing when temperatures rise, may help to maintain clover in the sward. Moderate fertiliser N applications in the cooler times of the year increase herbage accumulation and do not compromise clover permanently. However, it remains to be confirmed that the inhibited root production in spring, when N is applied, makes clover plants or branches in grazed swards more susceptible to local or temporal stress, such as drought. Plant breeding should be directed to improved rooting, and maintenance or improvement of N fixation.Key words : biomass allocation; branching; cattle grazing; climate; continuous stocking; fertiliser nitrogen; grassland; population and plant structure; radiation; rainfall; rainfall distribution; rooting; rotational grazing; stolon growth dynamics; temperature; Trifolium repens L.; white clover.</p
Al het voer uit de regio
No full textHoe ver kom je met mengvoergrondstoffen uit de regio en zijn kringlopen sluitend te maken? Is de teelt van graan en andere gewassen te combineren met een hoge soortenrijkdom aan planten en dieren? En hoe is zo’n regionaal productiesysteem rendabel te krijgen? Dit zijn een paar van de vragen die in het project Echt Overijssel! aan de orde kome
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