1. In general, the proportion of urea in substrate should not exceed 0.7%. Adding excessive urea may inhibit the growth of spawn or cause the poisoning and death of spawn.
2. Gross Nitrogen should be entirely added when building heap, it is improper to add again when you turn piles in later time.
3. When you detect that the indexes are normal while smelling ammoniacal odor after the fermentation, put off the inoculation, you could spread materials while shaking, then ted for 2-3 days until the smell totally disperses.