Energy crop production for biogas still relies mainly on maize, but the co-digestion of alternative energy crops (legumes, amaranth, ryegrass, flower mixtures) with maize can have several advantages. First, a greater biodiversity in the fields; second, an enrichment of essential trace elements in biogas substrates (cobalt, nickel, manganese, and molybdenum); and third, less use of artificial trace element additives. In two randomized field trials, 12 different variants of field crops in sole, double and intercropping were tested over a 2-year period. Dry matter yield, trace element content of the crops, and soil parameters like soil texture, pH, and soil element concentration were determined. The trace element concentrations in biogas plants resulting from input mixtures of energy crops (legumes, amaranth, faba bean, and ryegrass) and maize are calculated. High dry matter yields were obtained for ryegrass, maize, winter faba bean maize, intercropping winter faba bean/triticale-maize, and intercropping rye/vetch-maize. The double croppings with maize reached highest total yields (ca. 30 t DM ha−1). Total element deliveries from the harvest reveal large differences between the variants and the trace elements. Cobalt is provided most by summer faba bean maize and intercropping of winter faba bean/triticale-maize. Ryegrass can deliver the greatest amounts of Manganese and Molybdenum to biogas plants. When these energy crops are added to conventional maize input for biogas production, the trace element concentration in the fermenter can be raised significantly, e.g., 0.03 g Co t−1 FM can be attained compared to 0.003 g t−1 with maize silage input only. Sufficient Co can be provided by addition of manure to the input mixture. Alternative energy crops in combination with maize ensure a good dry matter yield per year and provide significantly more trace elements. However, these substrate mixtures alone do not provide enough trace elements, particularly Co. However, enough Co can be supplied by a small addition of manure.

中文翻译：

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替代能源作物增强了沼气生产中微量元素的输送：两年田间试验的结果

沼气能源作物的生产仍然主要依靠玉米，但是替代能源作物（豆类，mar菜，黑麦草，花混合物）与玉米的共消化可以具有几个优势。首先，在田间增加生物多样性；其次，在沼气基质（钴，镍，锰和钼）中丰富了必需的微量元素；第三，减少使用人工痕量元素添加剂。在两项随机的田间试验中，在2年的时间内测试了12种不同的单独，双作和间作的大田作物变种。确定了干物质的产量，农作物中微量元素的含量以及土壤参数（例如土壤质地，pH和土壤元素浓度）。能源作物（豆类，a菜，蚕豆，和黑麦草和玉米）。黑麦草，玉米，冬蚕豆玉米，间作冬蚕豆/小黑麦玉米和间作黑麦/紫etch玉米之间的干物质产量高。玉米双季作物最高总产量（约30吨DM ha-1）。收获物的总元素释放量表明变体和痕量元素之间存在很大差异。夏季蚕豆玉米和冬季蚕豆/黑小麦玉米间作的钴含量最高。黑麦草可以向沼气厂输送最大量的锰和钼。当将这些能源作物添加到用于生产沼气的常规玉米投入物中时，发酵罐中的痕量元素浓度可以显着提高，例如，与仅使用玉米青贮饲料时的0.003 g t-1相比，可以达到0.03 g Co t-1 FM。可以通过向输入混合物中添加粪肥来提供足够的钴。替代能源作物与玉米的结合，确保了每年良好的干物质产量，并提供了更多的微量元素。然而，仅这些底物混合物不能提供足够的痕量元素，特别是Co。然而，可以通过少量添加粪便来提供足够的Co。