How much land will I need for land-applying manure from dairy cattle?

Many factors impact land requirements including:
1) Dairy feeding program: Feeding excess protein or P increases N and P excretion.
2) Animal performance: Higher-producing cows excrete more manure; 90 lb milk/day was assumed in the example below.
3) Crop yields: A 24-ton/acre and 6-ton/acre yield for corn silage and alfalfa was assumed in the example below.
4) Use of manure on legume crops: Lack of economic return from manure N and possible damage to alfalfa may discourage use of manure …