In the matter of Yu Guanfu's compost, the choice of carbon sources is the key. If you are good at choosing carbon sources, compost is good.

The first to push the fallen leaves, the leaves are soft and rich in carbon. Every autumn, the leaves fall, and they are collected to be added to the compost. After decomposition, they are nourished in the soil.

Furthermore, straw is a common thing in farmers. Wheat straw, rice straw and the like, dry and easy to store, placed in the pile, can supply carbon sources, and make the compost loose and sparse, air circulation.

Hay is also a good choice. Its stems are tough and have a considerable amount of carbon. In pastures and countryside, hay is easily available, and compost is added to help fermentation.

And the bark is hard and carbon-rich. The decayed bark, broken and used, can slowly release carbon and make the compost last for a long time.

All these are the best carbon sources for composting. When used properly, compost is fertile, which can benefit the growth of grass and trees, and the soil is fertile, which is essential for practical farming.