ABSTRACT
Comparison of the efficiency of nitrogen in the cattle and pig slurries prepared acoording to three methods: storage, aeration and anaerobic digestion
Long-term effects of the landspreading of pig and cattle slurries on the accumulation and availability of soil nutrients
Relationships between soil structure and time of landspreading of pig slurry
Results of large-scale field experiments with sewage sludge as an organic fertilizer for arable soils in different regions of the Netherlands
The cumulative and residual effects of sewage sludge nitrogen on crop growth
Long-term effects of farm slurries applications in the Netherlands
Discussion on Part I
Summary Whereas anaerobic digestion has no effect on the quantity of the waste treated, it has well an
effect on its quality and consequently on its fertilizer value. Indeed, first of all, 30 to 40 per cent of the organic matter of the waste digested which can be either manure or sludge, are transformed into methane and the remaining organic matter is more stable. If the total nitrogen content of the waste remains more or less the same, the proportion of ammoniacal nitrogen increases (10 to 70 % increasing are reported) and the proportion of organic nitrogen decreases.
