Calculating by feed pile height of 30 cm, 1 square meter area requires 0.3 cubic meters of feed (can be counted as 0.3 tons). Feed price is 20 yuan/ton, and 5 kg of EM original liquid (about 60 yuan) is needed per ton of feed. Therefore, the required feed price is 6 yuan, and the required EM original liquid price is 18 yuan. On average, feed is added once every 20 days. Stocking density is 6,000~12,000 worms/square meter, with 1~2 cents per worm.
Therefore, the price of seed worms is at most 240 yuan/square meter. If the land is rented, calculated at land rent of 4,500 yuan/hectare, land rent is 0.45 yuan/square meter. Some other tool costs are temporarily estimated at 150 yuan. The total annual cost is 828.45 yuan/square meter. If both feed and land are self-owned, this part of the cost is deducted, and the total cost is 718.
5 yuan/square meter. After introducing earthworm seed stock once, self-breeding can be done. EM original liquid can be purchased once and then self-produced. Generally, a purchase of 10 kg costs about 150 yuan. Afterwards, sealed containers such as jars or buckets can be used to cultivate EM bacterial liquid by oneself, which greatly reduces costs. From the above, except for feed and land costs, others are one-time investments with long-term benefits. In other words, for a 1 square meter breeding area, an initial investment of 400~500 yuan can start.
Earthworms are hermaphroditic and cross-fertilizing. Each sexually mature worm produces eggs about once a week, producing 1 worm cocoon each time, with each cocoon hatching 3~5 earthworms. Cocoon hatching takes 15~20 days, and it takes 40~50 days after hatching to reach sexual maturity. Calculated this way, one breeding worm can reproduce 10 times in about 3 months (from parental worm to cocoon to hatching of small worms to sexual maturity).
Calculated with 12,000 worms per square meter stocking, after 3 months, it can reproduce to 120,000 worms. Harvest once every 3 months, keep 12,000 worms as breeding stock, harvest 3 times a year. Calculated by 2,400 worms/kg of mature worms, it can harvest a total of 135 kg/square meter annually. At the lowest price of 12 yuan/kg, income is 1,620 yuan/square meter (for seed stock sales or fishing bait sales, prices can reach 40~80 yuan/kg).
At least 1 ton/square meter of worm castings can be produced in one year, at a minimum price of 0.15 yuan/kg, income is 150 yuan/square meter (when flower and nursery companies resell worm castings to home flower and grass consumers, prices can reach 2~6 yuan/kg). Earthworms as a protein source can be added to feed for pigs and chickens, and worm castings can also be used to feed chickens and ducks. Within one breeding cycle, feed costs can be saved by 30%~50%, and the growth rate of the raised animals significantly increases.
If you raise pigs, cattle, chickens, etc. yourself, the earthworms bred can be self-sold, which is also a measure to increase production. For example, free-range native chickens originally need 7~8 months to reach market, but if earthworms are added to the feed, they can be ready to market in just 3~4 months.