Swede Magres

I have tried Best of All, Gowrie & Marion to name but a few? I have tried direct sowing and starting in pots which gave a slighty better crop, but not much better? Someone mentioned Boron defficiency at my last plot so I added borax, to no effect. I can't see my allotment soil being much different to the surrounding fields which seem to grow good crops?
In my search Magres was the only variety which was purely for human consumption as the rest were for animal feed as well?

We shall see!