I have noticed in my recent studies that inter-cropping of legumes (peas, faba bean) and canola in winter cereals (wheat, barley) can result in a stronger attraction of honeybees (pollinators) as compared to sole wheat and barley crops cultures. Likewise, more honeybees/pollinators were noticed when summer legumes (pigeon pea or mung bean) were inter-cropped in summer cereals (sorghum or millets) while no honeybees were found on sole cereals crop.
I conclude from my studies (2015-2016) that the cereal based cropping system decreases the number of honeybees in any climatic zone. Giving proper space to dicot crops, especially grain legumes (pulse crops, e.g. chickpea, lentil, peas, cowpea, faba bean, kidney bean, pigeon pea, mung bean, mash bean) and forage legumes (shaftal, berseem and alfalfa etc.) or introducing oil-seed crops (canola, sunflower, soybean, sesame, groundnut etc.) could significantly increase the population of pollinators and beneficial microbes in the soil.
In conclusion I could say that replacing the cereal based cropping system (monocot crops only) with suitable cropping system (having both monocot and dicot crops) could improve the soil and environmental quality.
Thanks.
Regards
Проф. Dr. Amanullah