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English Issue Built to last. Since 2002. Rely on the Originals! Biogas Journal | Spring_2021 GAS STORAGE FORMPROTECT PADDELGIGANT CHP VIELFRAß PROVEN. ROBUST. RELIABLE With our experience, we have been developing and manufacturing perfectly integrated components and turnkey plants in accordance with international CE and safety standards for over 20 years. Robustness, efficiency and reliability are our claim. Continuous development and innovation guarantee state-of-the-art technology and maximum availability. Our popular and trusted components are utilised in hundreds of biogas plants worldwide. Continuous research and development, uncompromising quality, numerous options and excellent spare parts supply guarantee the best product experience. The name agriKomp stands not only for efficient technologies, but also for innovation and practicality. The agriKomp group develops and manufactures all essential components of a biogas plant in its own network. Key components such as the Quetschprofi ® separator, the Paddelgigant ® agitator and the robust Vielfraß ® feeding technology have set international standards in terms of stability, reliability and energy efficiency – as well as our plants (55 - 3 MW el ) like the agriSelect ® , biogas upgrading system agriPure ® (150 - 2.000 Nm³) and own manufactured CHPs (55 - 530 kW el ). Discover our comprehensive portfolio: agrikomp.com WRITE YOUR OWN BIOGAS SUCCESS STORY! BECOME OUR OFFICIAL PARTNER. Over the years, we have developed various biogas plants adapted to the characteristics and regulations of each country, each market and each operator. With strong partners in the destination countries we have realised more than 1.000 biogas plants worldwide. Are you looking for proven technology for your clients or your next projects? Do you want to make business as a seller of biogas systems and / or service provider? Then we are the right partner at your side. We support you with a lot more than technology: Our 6-star promise supports the growth of your business. Sounds interesting? More information: business.agrikomp.com BIOGAS 2 PLANTS & COMPONENTS. efficient. flexible. sovereign. Contact us for more information: info@agrikomp.com | www.agrikomp.com
Biogas Journal | Spring_2021 Editorial Keep the edaphon alive! Dear Readers, In this issue of the Biogas Journal, among other topics, we address the subject of humus management in agriculture. The farm businesses with biogas plants introduced here are trying out management methods, some of which are unconventional, to increase humus content and thereby enhance overall soil fertility. Why deal with this topic? Well, in Europe, recent years have shown that when long periods without precipitation occur together with high temperatures, soil moisture levels are quickly depleted – depending on the type of soil and its humus content. On the other hand, plants grown in soil with a humus content of two percent or more or plants growing in plaggen soil reach a ripened or prematurely ripened stage later. One percent more humus in the soil means an additional saving of about 400,000 litres of water per hectare. Humus particles store twenty times their weight in water and up to 95 percent of soil nitrogen. This means that building up humus is worthwhile in order to increase the usable water holding capacity with regard to the water available in the soil. Also significant, though, is that with each additional tonne of carbon in the soil biomass, which is equivalent to about two tonnes of humus, 3.67 tonnes of CO 2 are removed from the atmosphere. We don’t have enough space here to list all of the many other benefits. This is why we should pay more attention to humus formation because, in the future, not only must our business activities be CO 2 neutral, but we must also remove a considerable portion of the previously emitted CO 2 from the atmosphere. From a purely scientific perspective, humus is made up of the total dead organic substance of the soil mixed together with the mineral soil. A central component is the so-called edaphon, which Raoul H. Francé was already investigating 100 years ago. Edaphon refers to the totality of living organisms, such as bacteria, archaea, fungi, viruses, protozoans, nematodes, spiders, insects and earthworms. The greater the amount of species and the amount of individuals per species, the more active and fertile the soil. This activity depends on soil temperature and soil water content, and therefore, also on the seasons. According to Australian soil scientist Dr. Christine Jones, however, it is even more important for plants that perform photosynthesis to be growing at the soil’s surface for as much of the year as possible. The edaphon, just as humus, is not produced by organic fertilisation alone, but instead due to root excretions (exudate). Among other items, these include amino acids and easily degradable sugars, which feed bacteria and fungi. In this way, the living plants pump large quantities of liquid carbon into the soil, which feeds the edaphon organisms. In a process akin to bartering, the microorganisms give the plants the nutrients they need from the soil. The so-called mycorrhizal fungi are particularly important in this interaction. U.S. soil scientist Dr. Elaine Ingham also talks about the “soil food web”, which refers to the process by which the edaphon organisms provide each other with nutrients; but they also form a nutrient chain based on the principle of “eat and be eaten” in which every dead organic substance is always recycled. We must become aware of natural connections and interactions and align our agricultural practices accordingly. Essentially, our lives depend on just the top few centimetres of topsoil. Everything that debilitates humus and inhibits the edaphon should be reduced to a minimum. I wish everyone success in increasing humus, boosting soil fertility and developing “ripe” soil. Best regards, Martin Bensmann, Editor, Biogas Journal German Biogas Association 3
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Spring 2021 EN

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