| http://www.w3.org/ns/prov#value | - For reasons such as health, the environment, and animal rights, veganic growers use plant-based fertilizers instead of blood meal, bone meal, fish emulsion, and pig manure.???They go back to more time-honoured methods of fixing nutrients in the soil,??? Houghton said. ???They do things like crop rotations and cover crops, where they???ll grow a crop that they then plough in to fix the nutrients.
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