As will be seen by referring to the analyses of soils[Pg 156] on p. 72, they may be deficient in certain ingredients, which it is the object of mineral manures to supply. These we will take up in order, and endeavor to show in a simple manner the best means of managing them in practical farming. ALKALIES. POTASH. Do all soils contain a sufficient amount of potash? How may its deficiency have been caused? How may its absence be detected? Does barn-yard manure contain sufficient potash to supply its deficiency in worn-out soils? Potash is often deficient in the.
