In recent years, quality problems in Swiss potato production have increased. In an on-farm experiment on 93 plots all relevant management, site and quality parameters are studied. The results can be summarised as follows: In 2001, only 30% of the plots fulfilled the Swiss quality standard without sorting out damaged tubers. For 19% the quality was even insufficient after sorting out damaged tubers. The proportion of plots with insufficient quality was highest for the organic farming system. In 2001, the most important external quality deficiencies were slug damage, wire worm and dry core. For all of them the position of potatoes in the crop rotation had an important influence. No serious attack of dry core was recorded after a fungicide treatment. An insecticide treatment in the preceding wheat crop could not always reduce wire worm damage sufficiently. A high occurrence of powdery scab was only observed for the variety Agria. No relationship could be found to soil pH. The starch content showed a high variability even within varieties, especially for Bintje and Agria. There was no clear influence of the farming system.
Tall oat grass and golden oat grass are typical hay-meadow grasses that are also suitable for forage mixtures. Of the four tall and three golden oat grass varieties tested, only one new variety of tall oat grass is likely to make it onto the List of Recommended Varieties.
Stevenel P., Wendling M., Brabant C., Suss H., Savoyat C., Dierauer H., Mascher F., Charles R.
FiBL and Agroscope investigated bread wheat varieties to determine their yield and quality stability. The results show that the choice of variety must be adapted to the site and that high yield potential does not go hand-in-hand with a high protein content.
Adapted and high-yielding varieties of forage plants are important for Switzerland as a grassland country. Hybrid ryegrass is a versatile forage grass that, thanks to breeding advances, has become even more persistent, disease-resistant and high-yielding over the past 30 years.