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^ШХР: *http://onlinelibrary.wiley.com/journal/10.1111/issues (http://onlinelibrary.wiley.com/journal/10.1111/issues)
^АВТ: Brandsaeter L.O.; Mangerud K.; Rasmussen J.
^ЗГЛ: Interactions between pre- and post-emergence weed harrowing in spring cereals [Взаимодействие между до- и послевсходовым боронованием в борьбе с сорняками яровых зерновых культур. (Дания. Норвегия)]
^ВЫХ: Weed Research, 2012; Vol.52,N 4. - P. 338-347
^ДАТ: 2012
^ПРМ: Bibliogr.:p.346-347
+Реферат:

^РЕФ: Pre- and post-emergence weed harrowing were studied in spring cereals in different environments and with two types of harrows in Norway during 2004-2006. The objectives were to investigate interactions between pre- and post-emergence weed harrowing and the importance of harrow type. We hypothesised that pre- and post-emergence harrowing interact positively, that a combination gives more stable weed control effects than pre- and post-emergence weed harrowing used alone, and that a harrow type with bent tines is more aggressive and suitable on hard-packed soils than a harrow with strait tines. The results only supported the last of these hypotheses. Post-emergence weed harrowing controlled a certain percentage of the present weeds, and this percentage was not dependent on pre-emergence weed harrowing. On average, pre-emergence harrowing reduced weed density by 26% and weed biomass by 22%, while the average effect of post-emergence harrowing was 47% on weed density and 41% on weed biomass. The combined effect of pre- and post-emergence weed harrowing was 61% on weed density and 54% on weed biomass. The combination did not give more stable weed control effects than pre- and post-emergence weed harrowing used alone. Pre-emergence harrowing increased the average crop yield by 6.2%, post-emergence harrowing by 4.0% and the combined effect was 10%. Crop yield was mainly increased on hard-packed soils. Weed and crop responses varied strongly among experiments, but the efficacy of pre- and post-emergence weed harrowing was positively correlated across experiments. Weed species composition was of minor importance regarding weed control. The study indicates that one aggressive post-emergence cultivation may be as good as one pre-emergence and one less aggressive post-emergence cultivation. However, little is known about the interactions between cultivation at different crop and weed growth stages. aref1

^TRN: 1557382
^ВИД: Статья из книги
^ЯЗК: Английский
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