Effects of different biochars and combined biochar and anaerobic digestate utilization on rye-grass and soil properties in laboratory model experiment

Recycling of organic wastes and preparation of added value products such as biochar or anaerobic digestate are challenges for a sustainable agriculture. Utilization of biochars to improve soil fertility and to mitigate global climate change is a popular research area. Residual of anaerobic digestion can be used as soil amendment as well, since it contains high amount of different macro-, and micronutrients mainly in water soluble form. Combination of digestate and biochars can cause various interactions, between digestate-biochar and soil system.

Harmonization and adaptation of archive and new data from different climatic regions and soil types are necessary in both topics. In our experiments the compilation of the biochar treatments was depended on volume ratio as the following: (1) control, (2) 1% (10g biochar), (3) 2,5% (25g biochar), (4) 5% (50g biochar) and 10% (100g biochar to soil). During the application of the biochar 150 cm3 kg-1 water/ digestate (60% of the soil’s plasticity) was used. These treatments were carried out in 4 replications, and 2 grams of rye-grass (Lolium perenne) were seeded in each pot. The experiment pots were watered to weight and the average plant height was measured after germination. Our results show that neither negative nor positive effect of the combined pyrolysis solid and digestate application can be determined clearly, thus further and long term investigations are needed.



Copyright: © European Compost Network ECN e.V.
Source: Orbit 2014 (Juni 2014)
Pages: 0
Price: € 0,00
Autor: Miklós Gulyás
Prof. Dr. Marta Fuchs
Annamaria Holes
Ph.D. Tamás András Szegi
István Kocsis

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