In the greenhouses of APH Eco-Culture they use only biological techniques to increase the yield.
For pollination of tomatoes in the greenhouse complexes of Stavropol Krai they involve bumblebees, which increase the number of fruits. The insects work in a whole hive, which is about 80 species. Just several of these hives can deal successfully with natural pollination within one greenhouse.
Check out this Russian TV report on the subject: