If you can get hold of some fresh horse manure it will help if tilled directly in. I put it in one September in some badly infested beds and by the next spring the problem was greatly reduced. Of course my weed problems were greatly increased.
Adding any organic matter will help because RKN thrive in sandy soil. I still have them in a couple of my beds bad enough that they sometimes affect my grafted plants that are on root stock that is RKN resistant. Mulching so the soil doesn't dry out helps a bit also. Rotating with onions, garlic or hot peppers also helps some.
Bill
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