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Conclusion

Drilling directly on ridges made in the autumn was most suitable when drilling was performed well in advance of the optimal time for the specific field. Due to dissatisfactory plant emergence – especially when drilling later – this method is not advisable in its tested form.

Autumn drilling resulted in the best yields, when drilling was performed close to the optimal day for the field, whereas deep-harrowing gave the best yields when drilling was delayed beyond the optimal day.

Please confer to NBR-report 729 for a praxis-near comparison of ploughing and deep-harrowing.