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I have much, 40 years experience from pastures where is no other bees or hives. I have seen, how far they visit, how plenty, what they fly and what is return direction when they get full load.
It is a big mistake that scientific researches about flying distances help you get better yields. It is like colours. What colours bees see, you cannot use that knowledge.
First of all I try to find sites where is no other hives. They are plenty on my district. But it may be apiary behind the woods. Who knows?
One day they are 3 km away their hives and next day they are not more than 1 km. If they get nectar near, they stay near hives.
Often there are 1 km corn field between hives and flower busches. They must fly over dry pastures. And that is bad.
One year they bring rape honey. I try to find the rape field but I did not found it. Then by accident after days I notice it. It was 4,5 km distance from hives. It was dry summer and they had not nothing else.
I tell one story from last summer:
It was rape field and to another direction it was wast fireweed area.
Difficult to find a place where to put hives. However I put 2 hives into site where it was to rape field 600 m and 1000 m to fireweed.
It was nice afternoon 16:00 when I inspected what is going on. Nothing. Flying was very week. Same day I have found a rape field, very tight and tall and blooming in very beginning. I went home, took stuffs and put hives on my sedan carry. I left a nuc box to gather foraging bees which are flying.
In the evening I brought that nuc away and there was not much bees., about half a litre.
That fireweed pasture was full of bumblebees. I saw only 2 my honeybees in flowers. Where were my bees? I think that they slept all day at home.