Nutrition potential of biowaste composts

Composts are important nutrient carriers. In Germany alone, with an estimated annual production of about 8 Mt (equivalent to 5 Mt DM), their nutrient potential represents almost 10 % of the phosphate, potash and lime currently applied as mineral fertilizers, as well as about 2.5 % of the mineral-fertilizer N applied in the whole German agriculture. To make efficient use of these nutrient amounts, composts require the targeted application as secondary raw material fertilizers (Gutser, 1997). Therefore, it is the aim of this paper to show the effects of macronutrients contained in biowaste composts, and to deduce general strategies for their use.

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