Effektar av traktorkøyring, gjødsling og frøblanding på avling, botanisk samansetjing, fôrkvalitet, nitrogenopptak og nitrogenfiksering i eng
Tor Lunnan
Bok Nynorsk
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| Omfang | 27
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| Opplysninger | The weight of tractors and farm machinery has increased in recent years. We have examined howtractor traffic affects physical properties of soil, grassland yields, botanical composition and foragequality of pure grass and mixtures of grass and clover stands at three locations in Norway; Tjøtta inNordland county, Fureneset in Sogn and Fjordane and Løken in Oppland. Tractor traffic reducedyields (20 %) on silty soil at Løken, while there was a moderate decline (6 %) on silty sand atFureneset, and no yield effect on sandy soil at Tjøtta. The tractor weight gave small yield effects,however, the results show that one should avoid traffic on silty soils under wet conditions wheneverpossible. Tractor traffic on silty soil changed the botanical composition at Løken. Red clover anddicot weeds decreased by traffic, while white clover and grass weeds (Poa annua, Alopecurusgeniculatus) increased. Traffic on silty soil also reduced nitrogen uptake and biological N fixation.Use of clover in the seed mixture gave a large positive effect on yield and forage quality. Use of 60 kgN in mineral fertilizer after the first cut increased grass yields, but reduced the clover content andthe biological N fixation. Nitrogen fertilizer and use of clover changed the grass composition indirection of more timothy and less meadow fescue. An increase from 15 % to 30 % clover in the seedmixture gave small effects on yields and botanical composition, but increased the biological Nfixation by 5 kg N ha-1 year-1.
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| Emner | report
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| ISBN | 9788217018735
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