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How to calculate the share of arable land with crop rotation? 

• 4 ha of arable land
• 1 ha under glass
• 1 ha of hops,
• 2 ha of arable land with annual crops and 100% crop rotation

Does this mean that the farm has 50% arable land with crop rotation, or is it 66,7%?

The answer is 66,7%. To begin with, 1ha under glass is excluded as it refers only to outdoor arable land.

Then we should calculate the percentage of arable outdoor land with crop rotation over total arable land which is the following:

1ha*0%+ 2h2ha*100%=200ha%2ha*100%/3ha=66,7%