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In recent decades, intensively used agricultural land in Germany has lost much of its natural soil fertility due to the use of extremely high levels of mineral nitrogen fertilizer and the intensive use of pesticides. Since 2005, we have been attempting to improve the biological soil fertility of these intensively used areas on about 170 agricultural areas with different soil indexes. The international longterm program Tandem12/21 (2012-2021) and the two previous research projects Radostim A*B (20052008) and future9/12 (2009-2012) have been investigating the potential of phytohormone-humic acid combinations (PHC) to increase soil biological fertility and to create a biological nutrient reserve in the soil. In the spring, PHCs are applied during the growing season. They stimulate the photosynthesis of the plants and promote the development of soil biology. Since 2012, e.g. with the start of the tandem program, the same areas has also been undertaking an additional PHC application in the autumn in order to activate the conversion of the organic material to humus and to stabilize soil biology in the winter phase. In the following, the used PHC preparations and current results of the monitoring biological soil parameters for the period 2006 to 2018 as well as results for the increase of yields with simultaneous reduced nitrogen use are presented.

The tandem long-term program 2012-2021 and some results on the rehabilitation of soil biology of intensively farmed agricultural land in Germany