[{"question":"What is Indian mustard and why is it used as a cover crop?","answer":"Indian mustard (Brassica juncea), also called brown mustard or Chinese mustard, is a fast-growing annual brassica used as a cover crop for biofumigation, weed suppression, and soil improvement. When chopped and incorporated into soil, Indian mustard releases glucosinolates—naturally occurring compounds that break down into isothiocyanates (similar to the active ingredient in synthetic soil fumigants). This biofumigation effect suppresses soilborne diseases, nematodes, and weed seeds."},{"question":"How does biofumigation with Indian mustard work?","answer":"Biofumigation works by incorporating fresh, chopped Indian mustard tissue into moist soil during active growth (typically at flowering stage). Cell rupture releases glucosinolates that convert to isothiocyanates—volatile compounds toxic to soilborne pathogens, nematodes, and weed seeds. For maximum effect: chop or flail-mow the stand, immediately incorporate into the top 4-6 inches of soil, and seal the surface with irrigation or a roller to trap gases. The fumigation effect lasts 1-3 weeks."},{"question":"When should I plant Indian mustard?","answer":"Plant Indian mustard in spring (April-May) or late summer (August-September). Spring plantings reach incorporation stage in 45-60 days. Late summer plantings provide biofumigation before fall planting of garlic, strawberries, or cover crop mixes. Indian mustard germinates in 3-7 days at soil temperatures above 45°F and grows rapidly in cool weather. It does not tolerate hard frost, so time fall plantings to allow full growth before killing frost."},{"question":"What is the seeding rate for Indian mustard?","answer":"Seed Indian mustard at 8-12 lbs per acre broadcast, or 5-8 lbs per acre drilled in rows. For small garden plots, use 0.25-0.5 lbs per 1,000 sq ft. Plant 0.25-0.5 inches deep. Indian mustard establishes quickly and needs no inoculant (it is not a legume and does not fix nitrogen). A firm seedbed with good seed-to-soil contact ensures uniform establishment."},{"question":"Does Indian mustard fix nitrogen like clover?","answer":"No. Indian mustard is a brassica, not a legume, and does not fix atmospheric nitrogen. Its value as a cover crop comes from biofumigation, rapid biomass production, nutrient scavenging (capturing residual soil nitrogen and preventing leaching), and weed suppression. Indian mustard can capture and recycle 50-100+ lbs of residual nitrogen per acre from the soil profile, preventing it from leaching into groundwater over winter."},{"question":"Can you eat Indian mustard leaves?","answer":"Yes. Indian mustard produces edible leaves commonly used in Asian, African, and Southern US cuisine as mustard greens. Young leaves harvested before flowering are tender and mildly peppery. However, seed sold for cover crop use is typically not treated for food-grade standards and may have seed treatments. If growing for dual-purpose (cover crop and food), verify the seed is untreated before planting for edible harvest."},{"question":"What soil conditions does Indian mustard prefer?","answer":"Indian mustard grows in a wide range of soils with pH 5.5-8.0. It performs best in well-drained loam but tolerates clay and sandy soils. Indian mustard is notably tolerant of heavy metals and has been researched for phytoremediation—using plants to extract contaminants from soil. It does not tolerate waterlogged conditions or standing water. For biofumigation, soil moisture at incorporation is critical—moist soil is needed to activate the glucosinolate conversion."}]
