Green manure crops are plants or a mixture of plants that are grown to improve soil structure and enrich the soil. They are indispensable in the process of improving the soil and preparing it for the planting season. Mustard is an excellent green manure crop. Its use provides disinfection of the soil, its enrichment with organic matter. The use of crushed green mass of mustard, introduced into the soil, is twice as effective as manure. Mustard has fungicidal and bactericidal properties, helps to clean the soil from wireworm and nematodes, which are pests of potatoes, beets and carrots. If you plant mustard between rows of perennial fruit and berry crops, it will suppress the growth of weeds.