Mustard residues which contain glucosinolates suppress soil-borne fungi and nematodes. For use as a soil biofumigant, mow mustard crop at flowering stage, but before mature seed set, and incorporate into the soil immediately.
The difference in between brown mustard and yellow mustard is that brown mustard grows more biomass and its glucosinolates are better at suppressing soil pathogens and nematodes.
Strong brown mustard stem residue can remain standing through winter, capturing snow and building moisture in the soil. Brown mustard emerges rapidly after planting and survives well in cool conditions.