It is prepared by the decomposition of animal and plant waste.
Explanation
Organic manure is a natural fertilizer produced through the biological decomposition of organic matter, playing a crucial role in sustainable agriculture by maintaining soil health.
- It is rich in specific nutrients but low in organic matter. is incorrect: Organic manure is rich in organic matter (humus) but generally contains low concentrations of specific nutrients (Nitrogen, Phosphorus, and Potassium) compared to synthetic chemical fertilizers.
- It provides nutrients in large quantities instantly. is incorrect: Unlike chemical fertilizers which provide nutrients immediately, organic manure releases nutrients slowly into the soil as the organic matter decomposes over time.
- It is prepared by the decomposition of animal and plant waste. is correct: It is prepared through the decomposition of animal wastes (such as cattle dung) and plant residues by the action of microorganisms like bacteria and fungi.
- It degrades soil structure over long-term use. is incorrect: Long-term use of organic manure improves soil structure, enhances water-holding capacity, and promotes soil aeration. It prevents soil degradation rather than causing it.
Key Takeaway: Organic manure is characterized by high organic content and slow nutrient release, derived from the microbial decomposition of plant and animal waste, serving to improve soil physical and biological properties.