The two things are Legume plants and fertilizers
farmers
To increase the fertility of the soil .
earthworms
snail enriches the soil by its waste(poo)
yes
Humus can do such a thing like that
their bodies decompose and enrich the soil so that plants can grow
manure and fertilizer act as a helper to the soil to perform their activities. they help for the following: i) to increase the fertility of the soil ii) help plants to produce better products. iii) thus improving the profit for the farmers. ...getting better income from the work increases the national income that leads to an improved economy.
the rivers flood and that means the soil is open to farm and grow crops.
The farmland was replowed to enrich the soil.
fertilizer
Yes it can, a decaying body is essentially fertilizer and nourishment for the soil.