Winter oilseed rape (Brassica napus) is a global major crop used for the production of vegetable oil. Typically sown in late summer and grown throughout winter and spring, it allows for interesting cultural practices, such as frost-sensitive intercropping with companion plants. This practice not only provides nitrogen resources much needed by the crop in the spring, but companion plants can also prevent weed growth in autumn, thereby reducing common herbicide use. Additionally, intercropping has the potential to protect the crop from insect pests. During winter 2019–2020, B. napus was grown alone (i.e., as a control) or intercropped with a mixture of faba bean (Vicia faba) and grass pea (Lathyrus sativus); because of the unusually clement weather conditions, the faba bean did not freeze, which allowed for the evaluation of the impact of these companion plants on the insect pest complex in spring. Insect damage by the beetles Psylliodes chrysocephala, Ceutorhynchus napi, and Brassicogethes aeneus was assessed in both treatments. The larval density of P. chrysocephala was significantly lower in the crop grown with service plants. Egg laying and damage by C. napi were significantly reduced when B. napus was intercropped, and the number of B. aeneus captured was significantly lower in the presence of service plants than in the control. Moreover, the yield from oilseed rape was significantly higher in the part of the field with service plants than in the pure crop control. The underlying mechanisms are only partially understood, but intercropping winter oilseed rape with frost-resistant service plants seems to be an ecologically sound practice with a very high level of potential to reduce insect pest pressure and increase crop yield. This may eventually reduce our reliance on chemical inputs in one of the most treated crops.
Organic Soybean cultivation experiences an upscale at the moment in Switzerland. As in the rest of Europe, Switzerland is still heavily dependent on protein imports. After years of stakeholders efforts of the development of a value chain for organic soybeans for human nutrition, various attempts to develop the soybean cultivation for feed proved to be fruitful despite the fact that Swiss price level is beyond competition for world market prices. The organic farmers themselves decided to become, at least partially, more independent from overseas soybean imports by opting for organic soybeans of European origin since 2019. Furthermore, Bio Suisse decided that from 2022 on, all ruminants under Bio Suisse certification must be fed with feed of Swiss origin, concentrates are limited to 5% of the ration. Since many years numerous projects are carried out to increase the domestic protein production by developing suitable production systems for peas, faba beans, lupines and soybeans with stakholders along the value chain. Since more than 30 years, Swiss breeders successfully develop 00 to 000 soybean varieties with a focus on human nutrition, organic soybean cultivation and the respective value chains from breeding to endproduct is developing strongly. This article will shed light on particular aspects and drivers, specific measures, relevant projects and cultivation techniques of organic soybean production in Switzerland in the past years and will give an outlook on the future of organic soybeans.
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