Cattle farming is common in Indonesia and many other countries; which produces animal waste. This waste has become the source of pollution that is difficult to manage. According to Hapsari1; solid cattle farming waste is can be utilized as biogas as alternative energy source. Most farmers use fecal matter as to produce biogas; which produces methane gas (CH4) and waste in the form of mud, which also produces biogas sludge that is rich in organic material. Sludge from cows contains high crude fiber and various minerals (such as phosphorus, magnesium, calcium, kalium, copper and zinc) needed by plants2.
The biogas sludge is being thrown into the rivers; which is causing environmental pollution. It can be used optimally as a substitute for bran in mushroom media. A research was performed to improve the nutrient content of biogas sludge by adding chicken blood meal (CBM) and fishmeal (FM) as substitute material for bran in white oyster mushroom media.
According to Aladetohun and Sogbesan3, blood meal contains 34.35% crude protein, 1.49% ether extract, 9.85% fibre, 9.00% ash, 9.50% moisture and 35.85% nitrogen free extract (NFE). Fishmeal contains very high crude protein, reaching 55-72%6. According to Sukimin4, bran is usually used for animal feed because it contains 11.3-14.4% protein, 15-19.7% fat and 34.1-52.3% carbohydrate. Fishmeal reacts quickly and is good for all kinds of plants and soil5. According to a research, biogas sludge and bran contains the same amount of crude fiber; while chicken blood meal has higher protein level than bran.
For this procedure, the biogas sludge was dried in the sun for 3 days then divided into 3 sections. The treatment consisted of dried biogas sludge with 0% CBM was called BP0 (which is commonly used by mushroom growers), BP1 (1% CBM) and BP2 (3% CBM). The mix of sludge with 1 and 3% blood meal was then added into the ingredients of mushroom media and three replicates were made of each treatment to determine the nutrient contents. The other treatment consisted of dried biogas sludge without FM (FP0), dried biogas sludge with 2% FM (FP1) and dried biogas sludge with 4% FM (FP2). Each treatment was analyzed of nutritional and biological contents and the data was tested through completely randomized design.
The research exhibited that the best treatments were BP2 and FP2. The replacement of bran by biogas sludge with 4% FM addition (FP2) in oyster mushroom media increased the fresh weight, the number of caps and the length of oyster mushroom stalks. In treatment BP2, the productivity of the oyster mushroom also enhanced as a result of increase in fresh weight and diameter of caps. This research will support and help to find the right composition for bran substitution in the fungus media to boost up the quality of mushrooms.
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25 August, 2019