Biogas digester fertilizer offers numerous benefits, including high nutrient efficiency, low oxygen consumption, rapid plankton growth, faster fish development, fewer disease occurrences, superior fish quality, cost-effectiveness, and ease of use. The sealed fermentation process effectively eliminates harmful bacteria and parasite eggs found in human and animal waste, resulting in healthier fish and improved economic returns. To achieve the best results, certain key practices should be followed.
First, it's essential to understand the optimal timing for applying biogas fertilizer. The peak availability of nitrogen and phosphorus typically occurs about one month after large-scale feeding into the biogas digester. Applying the fertilizer at this stage ensures maximum benefit for the fish pond. Monitoring the nutrient levels and timing the application correctly is crucial for both quality and yield.
Second, proper application techniques are important. Biogas fertilizer works well as a base fertilizer when combined with clear pond conditions. It can also serve as a topdressing fertilizer, acting quickly but needing to be applied in smaller, more frequent doses. Typically, it should be applied once daily. However, during hot weather or when water clarity drops below 25 cm, it may be necessary to apply it every other day or less frequently. Maintaining a minimum water transparency of 20 cm is recommended. In midsummer and early fall, water transparency should be maintained around 25 cm by replacing or adding fresh water. By late fall, keeping it around 25 cm is ideal.
Third, selecting the right fish species is important. For ponds using chemical fertilizers, it's best to raise filter-feeding fish like silver carp, bighead carp, and tilapia. Omnivorous species such as mussels, clams, and tilapia can also be suitable. The main fish species should make up at least 60% of the population, while feeding fish should be kept to a minimum to avoid overstocking.
Fourth, the layout of the fish pond and biogas system should be carefully planned. A standard ratio of fish pond area to biogas tank area is 100:0.2–0.3. This helps prevent either an excess of pond space or an overabundance of biogas fertilizer, ensuring a balanced and efficient system. Proper planning and management are essential for long-term success and sustainability.
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