However, since the fixation of atmospheric nitrogen is directly linked to other nutrients, it is important to monitor their levels in the soil. Besides sulfur, phosphorus is also significantly involved in the fixation process. Sulfur plays a particularly important role and, in cases of deficiency, can have a tenfold impact on the nitrogen balance. The sharp decline in atmospheric nitrogen inputs over the last three decades therefore makes the question of additional sulfur fertilization a critical one at various sites.

The attached article describes the effects of fertilization with sulfur and phosphorus in different variations on the grain legumes broad bean, pea, lupin and soybean, and their background.