Fertility, that state or condition of the soil which enables it to produce crops.

Fibre, long thread-like structure.

Flocculate, to make crumbly.

Free water, standing water or water which flows under the influence of gravity.

Function, the particular action of any part of an organism.

Furrow, the trench left by the plow.

Furrow slice, the strip of earth which is turned by the plow.

Germinate, to sprout.

Grafting, the process of inserting a cion or bud in a stock plant.

Green manure crops, crops intended to be plowed under to improve the soil.