50.95 pounds of potash in one ton of alfalfa. This would mean that in the yield of alfalfa hay from a given area, estimated at four tons per acre for the season, alfalfa would furnish 176 pounds of nitrogen, 33.08 pounds of phosphoric acid, and 203.8 pounds of potash. If this alfalfa were fed upon the farm, it would not only prove a cheap source of protein for feeding, but it would furnish fertility, as stated above, without seriously diminishing the supply of the same in the surface soil, since much of the fertilizing material produced would come from the air and subsoil. The manure thus made, if carefully saved and applied, would thus add materially to the fertility of the land. If, however, the alfalfa were sold, the mineral matter drawn from the cultivable area of the soil and from the subsoil lying under it would be reduced to the extent of the draft made upon these in growing the alfalfa.

The direct influence of alfalfa upon the fertility of the land on which it grows is shown in the greatly increased production in the crops which follow alfalfa. This increase is not only marked, but it is frequently discernible for several successive years. But as has been intimated, the benefit that would otherwise accrue from growing alfalfa as a direct means of fertilizing the land is much circumscribed by the long term of years for which it is usually grown.

The mechanical effects of alfalfa upon the land are beneficent. It improves the tilth by means of the shade furnished, and the extent to which the

roots fill the soil. These in their decay further influence favorably that friability which is so desirable in soils that are cultivated, and as previously stated, the long, deep roots in their decay exercise a salutary influence on drainage.

The work of breaking alfalfa fields is frequently laborious, owing to the number and size of the roots. If, however, a plow is used, the share of which has a serrated edge, the roots will be cut or broken off more easily and more effectively.

CHAPTER V

ALSIKE CLOVER

Alsike Clover (Trifolium hybridum) takes its name from a parish in the south of Sweden. From there it is probable that it was introduced into England. Linnæus gave it the name of hybridum, imagining it to be a cross between the red and the white varieties. Botanists do not generally hold this view. It is known by various names, as Swedish, White Swedish, Alsace, Hybrid, Perennial Hybrid, Elegant and Pod Clover, but more commonly in America it is spoken of as alsike.

The plants of this variety are more slender than those of the medium red variety, although they grow in some instances to a greater height. The slender stems are much branched. The leaves are numerous and oblong in shape, the flowers are of a pinkish tint, the heads are globular and are about threefourths of an inch in diameter, and the pods, like those in white clover, contain more than one seed. The roots are in no small degree fibrous, and yet the slender tap root goes down to a considerable dis

tance.

Alsike clover is a perennial. In favorable situations it will live for many years. Ordinarily, it grows to the height of 18 to 24 inches, but in slough

lands it sometimes grows to the height of 5 feet. The plants do not reach their full size until the second year, and in some instances until a period even later. They grow less rapidly than those of medium red clover, are several weeks later coming into flower, and grow much less vigorously in the autumn. Ordinarily, they furnish but one cutting of hay each year. Because of the more fibrous character of the root growth, the plants do not heave so readily as those of red clover. In moist situations they are much given to lodge; hence, the importance of growing this crop, when grown for hay, along with some kind of grass that will help to keep the stems erect.

Alsike clover furnishes a large amount of pasture. It is relished, at least, fairly well. The leaves are slightly bitter, but not enough to seriously interfere with their palatability. The quality of the hay is excellent. This arises from its fineness, from the number of the small branches and leaves on the stems, and from its fragrance when well cured. While it makes a very suitable hay for horses and cattle, it has peculiar adaptation for sheep, owing to its fineness.

As a fertilizer it is probably not equal to medium red clover, since the root growth is not so bulky. Nor does it produce a second cutting anything like so vigorous as the former. Nevertheless, the roots possess even stiff soils to such an extent that they not only furnish them with much plant food, but they also tend to disintegrate them and to render them more easy to pulverize.