Spring 2021 EN

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English Issue Biogas Journal | Spring_2021 Julian Grötzinger with a whole crop silage mixture of winter peas, barley, rye and Landsberger mixture. manure. Despite the high protein content, the digestate no longer smells after it has been processed. That works one hundred percent,” he says. The In-Wa Quartz makes the manure black, although only 0.5 liter of it is needed for every 100 cubic meters. The digestate goes into a rotting phase and that brings about a stimulating effect for self-protection. “In an experimental field, we treated organic rapeseed with In-Wa Quartz and lime,” said Grötzinger when talking about a particular incident. “The rapeseed had been completely infested with the rapeseed gloss beetle. The next day, there wasn’t a single beetle to be seen.” He says that Leonardite is a lignite precursor that results from the humification of plant matter. That makes it rich in humic acids (up to 90 percent). “The Leonardite binds the nitrogen and the plant gets it little by little, whenever it needs it, which means that there is no free nitrogen present in the soil.” This conditioning prevents nitrate from being leached out. “I have two digestate storages,” he said when explaining his nutrient management methods. “The digestate from the farms that supply me with clover grass is not treated, unless this is expressly requested. The treatment costs 1 Euro per cubic meter.” Composting digested, separated solids Grötzinger spreads liquid digestate with the trailing shoe method and makes sure it is distributed over cultivated fields. That can be achieved by cultivating catch crops and by splitting the individual applications. “We no longer have any fertilizer burn. Spreading manure over open soil would cause rotting,” he said. “You would ‚encourage‘ weeds to grow.” Grötzinger has also produced “MC compost” from the solid phase. “To do that, the material is spread on a storage clamp and compacted. The nitrate and moisture content must be well-balanced. It takes eight weeks for compost that is rich in humic acid to form and that way there is less carbon loss than in usual compost,” he explains. According to the current fertilizer ordinance, MC compost may no longer be produced on open fields, although as it turns out, it is completely dry beneath the storage clamp and Nmin sampling has not shown considerable amounts of nitrogen. That is why Grötzinger stores the solid phase in a covered horizontal clamp and then distributes it like that. “The system needs time to warm up,” Grötzinger summarizes. He maintains that you cannot expect any miracles overnight. But the trend in the right direction became clear quite quickly. “We managed to produce between 0.2 and 0.5 percent of humus within three years – depending on the location,” he said. But he spends a lot of time on the plant production system, criticizing that the biggest problem of some of the farms nowadays is the lack of time. “Everyone is in a hurry, nobody wants to wait.” He criticizes the lack of patience and the fact that liquid manure or digestate is then spread on the fields in as early as March. “If you see how wet the soil is, you shouldn’t be driving over it with a total weight of 25 tons.” He said that last year, he sowed maize as late as June 2 nd and then managed to shred 60 tons of fresh matter; and that is all grown organically with a supply of 15 cubic meters of digestate. “I’ve never known anyone not to succeed because they did something too late, but rather because they did it too early. Just wait and keep cool,” he says. “If you take pleasure in the method and the soil, the rest will practically work by itself.” photo: Christian Dany Author Christian Dany Freelance Journalist Gablonzer Str. 21 · 86807 Buchloe 00 49 82 41/911 403 christian.dany@web.de 12
Biogas Journal | Spring_2021 English Issue www.schaumann-bioenergy.com ... with individually tailored specialty products based on the BC. Concept, a range of micro nutrients, multi-enzyme combinations and special SILASIL ENERGY biological ensiling agents. Sales representatives for G B, I T, AT, F R , C Z , S K , C H , H R , G R , U S , C A , B R and many other countries … Precise analysis, innovative products, competent consultancy: +49 4101 218-6000 Competence in biogas 13
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