Human feces can be mixed with ferrous sulfate at a ratio of 500–600 grams per 100 kilograms of excrement. This combination helps convert ammonium carbonate, commonly found in human waste, into stable ammonium sulfate. This process not only enhances the fertilizer value but also reduces odors and prevents nitrogen loss through volatilization, making it a more efficient and environmentally friendly method of composting.
When human excrement is combined with superphosphate at a rate of 5 kilograms per 100 kilograms of waste, and left to ferment for 3 to 10 days, the highly volatile ammonium carbonate transforms into stable ammonium phosphate. This increases the phosphorus content in the mixture, which, when combined with nitrogen, significantly improves the overall fertilizer effect, providing a balanced nutrient source for plants.
Another method involves mixing grass ash with superphosphate. For this, 6 kilograms of grass ash is dissolved in 30 liters of water, and then 2 kilograms of superphosphate is added. After standing for 6 hours, 100 liters of water is added, and the mixture is thoroughly stirred. Once settled, the clear liquid is used as a fertilizer. This solution provides potassium and acts similarly to other organic fertilizers, enriching the soil with essential nutrients.
In another approach, compost is mixed with ammonium bicarbonate. By chopping weeds, plant stems, and leaves into small pieces, and adding 0.5% to 1% ammonium bicarbonate along with human excrement, the mixture is sealed with mud. After complete decomposition, it turns into an efficient biological potassium fertilizer that supports healthy plant growth.
Additionally, mixing 20% calcium superphosphate into livestock manure and allowing it to decompose for 20 days helps prevent nitrogen loss and speeds up the breakdown of the manure. This process also increases the availability of phosphorus, making the fertilizer more effective and sustainable for long-term use.
By using these methods, farmers and gardeners can turn organic waste into valuable fertilizers, reducing the need for chemical inputs while improving soil fertility and crop yields. These techniques are practical, cost-effective, and beneficial for both the environment and agricultural productivity.
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