| Popis: |
At the experimental farm Wiesengut in Hennef (Germany) in 2007/8 four different cultivation methods of rapeseed and an application of fertiliser in springtime were tested in order to manage weeds, to reduce nitrogen losses during wintertime and to enhance grain yield. Cultivation methods tested included i. narrow row distance (12 cm), no mechanical weed control; ii. wide row distance (24 cm), mechanical hoeing; iii. rapeseed sown in double rows intercropped with buckwheat (Fagopyrum esculentum Moench) sown in double rows, row distance 12 cm, no mechanical weed control; iv. rapeseed sown in double rows and left double rows free, row distance 12 cm, mechanical hoeing. In a two factorial completely randomised block design these treatments were fertilised (I. 80 kgN/ha as PPL, Potato Protein Liquid) and not fertilised (II.) in March 2008 at EC 30. In contrast to the hypothesis treatment iii. (rapeseed intercropped with buckwheat) did not control weeds efficiently nor enhanced nitrogen uptake before winter. Grain yield was significantly lower in this treatment compared to all other treatments. The most cost-efficient treatment i. controlled weeds effectively. Grain yield was not significantly lower in this treatment compared to the more cost-intensive treatments (ii. & iv.) where hoeing was performed. Across treatments calculated, application of PPL increased grain yield significantly. |
