Division 1.9.2 The fertility and biological activity of the soil shall be maintained and increased:

except in the case of grassland or perennial forage, by the use of multiannual crop rotation including mandatory leguminous crops as the main or cover crop for rotating crops and other green manure crops;

in the case of greenhouses or perennial crops other than forage, by the use of short-term green manure crops and legumes as well as the use of plant diversity; and

in all cases, by the application of livestock manure or organic matter, both preferably composted, from organic production.