Organic waste products used as fertilizers
Organic vegetable production on stock-less farms has a need of various off-farm nutrient resources. The parts of agricultural co-streams that not can be used as food or feed are relevant to be used as fertilizers for those needs. Waste products with soil or certain animal residue compounds needs to be hygienized before use on agricultural land. This can be done through a composting process at high temperature or as part of the aimed processing or industrial treatment (e.g. bio-gas facilities) that produce the co- stream material.
Our research within this topic has be related to utilization of anaerobic digested food waste, shrimp shell and alga meal in comparison with animal manure and mineral fertilizers. The nitrogen use efficiency, mineralization time and product yield and quality have been studies.