Do orchids like decaying flesh?
In the process of orchid care, the choice of organic fertilizer always piques the curiosity of orchid enthusiasts. As a special organic matter, decaying flesh is rich in nutrients but also hides risks. Can it become a source of nutrition for orchids? This article will analyze the delicate relationship between decaying flesh and orchids from a scientific perspective.
Feasibility Analysis of Using Decaying Flesh as Fertilizer for Orchids
Decomposition Mechanism of Nutrients in Decaying Flesh
Decaying flesh is rich in protein (about 15-20%) and fat (20-30%), which are converted into absorbable substances for plants such as amino acids and nitrates after microbial decomposition. The nitrogen content can reach 4-6%, which is twice that of ordinary organic fertilizers, and can effectively promote the synthesis of chlorophyll in orchid plants. However, untreated decaying flesh can release toxic substances such as hydrogen sulfide (H₂S), which can cause damage to the roots when the concentration exceeds 0.1ppm.
Potential Risks and Alternative Solutions
Using raw decaying flesh directly can lead to three major issues: ① the survival rate of eggs is as high as 80%; ② putrefactive bacteria damage the symbiotic bacterial system; ③ the fermentation temperature can reach 60°C, burning the roots. It is recommended to use safe alternatives such as bone meal (containing 12-14% phosphorus) or fish protein fertilizer (amino acid content ≥35%), applying once a month can meet the needs.
Scientific Preparation Process of Decaying Flesh Fertilizer
If you insist on using it, you must strictly follow the EM bacteria fermentation method: ① chop the decaying flesh and mix it with straw in a 1:3 ratio; ② add a fermentation agent (0.5% dosage) to maintain a constant temperature of 55°C; ③ turn the pile every 3 days to ensure oxygen supply; ④ continue for 25-30 days until there is no odor. When using, dilute it to a 5% concentration, and apply with 0.1% Bacillus subtilis to increase nutrient utilization by 40%.
Comparative experiments have found that scientifically treated decaying flesh fertilizer can increase the arrow shooting rate of orchids by 18%, but the soil EC value (preferably controlled between 0.8-1.2mS/cm) needs to be tested monthly. It is recommended for beginners to prioritize using ripe soybean cake fertilizer (NPK ratio 3-1-1), which is safe and can meet 80% of the nutrient needs of orchids.