The correct answer is: B. 50 %
Aerobic biological activity is the process by which microorganisms break down organic matter in the presence of oxygen. This process is essential for the production of compost, as it helps to convert organic matter into a stable, humus-rich material.
The moisture content of the compost mass is an important factor in maintaining aerobic biological activity. If the compost is too dry, the microorganisms will not be able to function properly and the composting process will slow down. If the compost is too wet, the microorganisms will produce anaerobic respiration, which produces harmful gases such as methane and ammonia.
The ideal moisture content for compost is between 50% and 60%. This means that for every 100 grams of compost, there should be 50-60 grams of water. You can test the moisture content of your compost by squeezing a handful of it. If it crumbles easily, it is too dry. If it is too wet, it will form a ball. If it is the right consistency, it will hold together when you squeeze it, but will crumble when you release it.
If your compost is too dry, you can add water. If it is too wet, you can add dry materials such as leaves or straw. You can also aerate the compost by turning it over with a shovel or pitchfork. This will help to add oxygen to the compost and prevent anaerobic respiration.
Maintaining the correct moisture content is essential for the successful production of compost. By following these tips, you can ensure that your compost is healthy and productive.