KVÄVEUPPTAG HOS FÅNGGRÖDORNA VITSENAP OCH OLJERÄTTIKA VID OLIKA ETABLERINGSMETODER :

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The object with this thesis is to evaluate which of the catch crops oil radish and white mustard in combination with establishment method, give the most effective nitrogen uptake. The main purpose of the catch crops is to reduce leakage of nitrogen. They are sown after the main crop and killed before the next crop. In Sweden the farmers gets subsidies to establish catch crops. The thesis is limited to the trail L3-9010 sited at HS- Malmöhus, Borgeby Gård, 237 91 Bjärred, Sweden, 2007. Only treatments with oil radish, white mustard and the reference treatments were studied. Total 9 treatments. The different establishment methods/dates were sown by broadcasting the 12th of July, sown by broadcasting the 10th of August, ploughing plus sowing with a Rapid sowing machine within 24 hours after harvest and shallow cultivation plus sown by broadcasting within 24 hours after harvest. The conclusion was that it was the establishment methods/dates that affected the uptake of nitrogen per hectare of the catch crop. The choice between oil radish and white mustard did not matter. Establishment through broadcasting the 12th of July (treatment D and E) and ploughing plus sowing with a Rapid sowing machine within 24 hours (treatment H and I) after harvest were the best establishment methods/dates to absorb nitrogen. The reason why establishment through broadcasting the 12th was better than establishment through broadcasting the 10th of August, could be because July was a very wet month compared to August. Why ploughing plus sowing by Rapid within 24 hours after harvest was better th...