Explanation:
The slurry of a bio-gas plant is an enriched manure that is rich in oxygen and various nutrients. Here's a detailed explanation of why option B - Sulphur and Nitrogen - is the correct answer:
1. Bio-Gas Plant Slurry:
- The slurry is a byproduct of the bio-gas plant, which produces biogas through the decomposition of organic matter.
- It is a mixture of organic waste, water, and bacteria.
2. Oxygen Content:
- The slurry of a bio-gas plant is indeed rich in oxygen due to the presence of water and the process of decomposition.
- Oxygen is a key component required for the growth and survival of various organisms.
3. Nutrient Enrichment:
- The slurry of a bio-gas plant is also enriched with various nutrients that are essential for plant growth and soil fertility.
4. Sulphur and Nitrogen:
- Sulphur and Nitrogen are two important nutrients present in the slurry.
- Sulphur is necessary for the synthesis of proteins and enzymes, and it also plays a role in the formation of chlorophyll.
- Nitrogen is a crucial component of amino acids, proteins, and nucleic acids, which are essential for plant growth and development.
5. Other Nutrients:
- While the slurry may contain other nutrients as well, such as phosphorus, potassium, zinc, aluminum, boron, and potash, they are not specifically mentioned in the question.
- Phosphorus and potassium are commonly found in manure and are essential for plant growth.
- Zinc and aluminum are trace elements that plants require in small amounts.
- Boron and potash are also important nutrients for plant development.
Conclusion:
In conclusion, the slurry of a bio-gas plant is an enriched manure that is rich in oxygen and various nutrients. While it may contain other nutrients, the question specifically mentions sulphur and nitrogen as the correct answer.