When tillage is important in organic agriculture

Organic systems rely on the application of organic amendments, green manures and other organic matter sources with the dual purpose of  

1 building up soil fertility through an increase in SOM quantity and quality and 

2 supplying adequate amounts of nutrients, especially nitrogen (N), to sustain crop growth and productivity. 

This indirect approach to crop fertilisation, which clearly reflects the preventive, long-term nature of agronomic recommendations set forth in organic systems (IFOAM 2005), increases 

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