crop rotation help required pls

[Piglet6]

Could you guys please help me with with a "4 section crop rotation".

My first year has been:
Legumes
Brassicas
Potatoes
Onions and roots

How should year 2 be planted?

Many thanks.

[Geoff]

I would have thought this would work:

Year 1.........Year 2.........Year 3.........Year 4
Legumes.....Brassicas....Onions........Potatoes
Brassicas....Onions.........Potatoes....Legumes
Potatoes.....Legumes.....Brassicas...Onions
Onions........Potatoes.....Legumes....Brassicas