Left, Clay Subsoil;center, Same, With Fertilizer;right, Same, With Humus

If we wish to keep up the fertility of our lands we should not allow anything to be lost from our farms. All the manures, straw, roots, stubble, healthy vines—in fact everything decomposable—should be plowed under or used as a top-dressing. Especial care should be taken in storing manure. It should be watchfully protected from sun and rain. If a farmer has no shed under which to keep his manure, he should scatter it on his fields as fast as it is made.

Fig. 15. The Cotton Plant with and without Food

Fonte: Agriculture for Beginners