Table 3. Average values of estimated yield reduction of the organic and the biodynamic treatment compared to the integrated treatment.
| 2010 | 2011 | 2012 | ||
|---|---|---|---|---|
| org | gravimetrically measured yield reduction [%] at harvest | 26.2 | 35.3 | 46.2 |
| estimated yield reduction caused by downy mildew [%] | 11.2 | 0 | 6 | |
| estimated yield reduction caused by berry weight [%] | 5.9 | 8.5 | 1.1 | |
| estimated yield reduction caused by bunch weight [%] at veraison | - | - | 16.6 | |
| biodyn | gravimetrically measured yield reduction [%] at harvest | 19.6 | 37.8 | 44.5 |
| estimated yield reduction caused by downy mildew [%] | 10.3 | 0 | 3.2 | |
| estimated yield reduction caused by berry weight [%] | 2.7 | 8.5 | 1 | |
| estimated yield reduction caused by bunch weight [%] at veraison | - | - | 24.8 |
Yield reduction [%] is calculated from gravimetrically measured yield at harvest, yield reduction by downy mildew is estimated according to EPPO-guideline, yield reduction by berry weight is estimated taking into account average berry weight before harvest and yield reduction by cluster weight is estimated according to differences in cluster weight at veraison in 2012 (org = organic treatment, biodyn = biodynamic treatment).