Mustard cake is used as an organic fertilizer capable of deterring wireworms, nematodes, rodents, suppress the development of Phytophthora. The cake contains such substances as: fatty acids, essential oils, glycosides, fiber, proteins, mineral elements.
It is used for potatoes - 1 tablespoon in a hole; for other crops - when digging from 0.1 to 1 kg per 1 m2 depending on the type of soil and crops, to a depth of at least 5 cm. Not for seedlings.