Production practice has shown that using a mixture of biogas residue and cottonseed husks for mushroom cultivation offers five key advantages over using cottonseed husks alone. First, it significantly reduces the amount of cottonseed hulls needed, cutting the cost of mushroom farming by up to 30%. Second, this combination leads to higher mushroom yields—up to 80–100 kilograms per 100 kilograms of substrate, which is about 20% more than traditional methods. Third, the mycelium grows faster, allowing mushrooms to emerge earlier and shortening the overall cultivation time. Fourth, the resulting mushrooms are richer in nutrients, have better shape, color, and taste, and are more resistant to storage and transportation. Lastly, the leftover mushroom residue can be effectively used as a high-quality fertilizer for farmland.
The method of preparing the culture material using biogas residue and cottonseed husks involves first removing and filtering the matured biogas residue until it holds water without dripping. The new cottonseed husks are then sterilized and soaked. For every 60 kg of biogas residue, 140 kg of cottonseed husks are mixed in, along with 1% gypsum powder, 1% urea, and 0.5% superphosphate. All ingredients are thoroughly combined, pressed into blocks that are 12 cm thick, and then inoculated with mushroom spawn.
Before inoculation, it's important to select healthy, disease-free strains with strong mycelium growth. After the substrate is compacted, small holes are dug in a plum blossom pattern, spaced 6 cm apart and 3–4 cm deep. Each hole is filled with mushroom spawn, then covered with a mixture of biogas residue and fine sand (half of each), pressed tightly, and finally covered with plastic film to maintain moisture and warmth. Daily management follows the same procedures as those used in pure cottonseed husk cultivation, ensuring consistent conditions for optimal growth.
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