Fig. 3. Alfalfa (Medicago sativa)
Oregon Experiment Station
Alfalfa is perennial. In the duration of its growth, no fodder plant grown under domestication will equal it. It has been known, it is claimed, to produce profitable crops for half a century. In some of the Western States are meadows from 25 to 40 years old. Ordinarily, however, the season of profitable growth is not more than, say, 6 to 12 years when grown on upland soils. The meadows usually become more or less weedy or possessed by various grasses, and some of the plants die. The plants at first send up a single stem. When this matures or is cut back the uncut portion of the stem dies down to the crown of the plant, which then sends out other stems. This is repeated as often as the stems are cut down until many stems grow up from one plant as indicated above, unless the plants are so crowded that such multiplication is more or less hindered. The plants grow rapidly as soon as spring arrives, and as often as cut off they at once spring again into vigorous life, where the conditions are favorable to such growth; hence, from one to twelve cuttings of soiling may be obtained in a single season, the former result being obtained in arid climates, where the conditions are unpropitious, and the latter being possible only in congenial soils, where the winters are very mild and where the soils are irrigated. Usually, however, even on upland soils and in the absence of irrigation, not fewer than 3 to 5 cuttings of soiling food are obtained each year and not fewer than 2 to 4 crops of hay.
A number of varieties so called are grown in this country. They differ from each other more, however, in their adaptation in essential properties relating to the quality of the pasture and fodder produced, than in the quality of food product obtained from them. The variety commonly grown from seed produced in the West is usually spoken of simply as alfalfa, while that grown from seed European in origin has been more commonly called Lucerne. The former of these has a tendency to grow taller than the latter and to send its roots down to a greater depth. In addition to these, such strains as the Turkestan, the Rhenish, the Minnesota and Sand Lucerne have been introduced.
The Turkestan variety was introduced by the United States Department of Agriculture during recent years. It was brought from provinces beyond the Caspian in Russia, Asia. The object sought was to introduce a variety that would better withstand the rigors of a climate dry in summer and cold in winter than the variety commonly grown. Some strains of this variety have proved drought resistant to a remarkable degree. It has also shown itself capable of enduring without injury temperatures so low as to result in the destruction of plants of the common variety. In trials made by growers in North Dakota and Northern Minnesota, it has been found able to endure the winter's cold in these areas. But it has also been found that while the plants produced some seed in the Central Mountain States, they did not produce much seed when grown in the Northern States. Unless seed can be secured from plants grown in the latter in sufficient quantities to meet the needs of growers, it is feared that in time some of the hardy characteristics of this variety will be lost if the Central and Southern Mountain States must be relied upon as the American sources of seed supplies.
The Rhenish strain comes from Central Europe. It has been highly commended by some European seedsmen for its hardihood, but it has been as yet grown to only a limited extent in America. The Minnesota strain was doubtless brought to Carver County by German farmers, by whom it has been grown in the neighborhood of Lake Waconia for nearly 20 years. It has been found much hardier than the common variety when grown in that neighborhood, and the endurance of plants grown from seed of this strain far northward has been very pronounced. As this variety produces reasonably good seed crops in Central Minnesota, it would seem reasonable to expect that it will become popular in Northern areas. Sand Lucerne, which comes from Central Europe, has considerable adaptation for poor and light soils, and in trials made at the Michigan experiment station was found possessed of distinctive merit for such soils.
Where alfalfa can be grown freely, it is unexcelled as a pasture for swine, and is in favor also as a pasture for horses. While cattle and sheep grazed upon it are exceedingly fond of it, the danger that it will produce bloat in them is so frequently present as to greatly neutralize its value for such a use. It is a favorite pasture for fowls. In furnishing soiling food where it produces freely, it is without an equal in all the United States. It is highly relished by all kinds of farm animals, not excluding rabbits and goats, and when fed judiciously may be fed in this form with perfect safety. Its high value in producing such food rests on its productiveness, its high palatability and the abundant nutrition which it contains. As a hay crop, it is greatly prized. Even swine may be wintered in a large measure on cured alfalfa hay.
As a fertilizer, the value of alfalfa will be largely dependent on the use that is made of the plants. When pastured or fed upon the farm, the fertility resulting being put back upon the land, it ranks highly as a producer of fertility. But this question is further discussed on page 191. As a destroyer of weeds much will depend upon the way in which it is grown. This question also is discussed again. (See [page 185.])
Distribution.—It is thought that alfalfa is more widely distributed over the earth's surface, furnishes more food for live stock, and has been widely cultivated for a longer period than any other legume. It is grown over wide areas of Asia, Europe, North and South America, and its cultivation is constantly extending. It was grown on the irrigated plains of Babylon long before the days of Nebuchadnezzar. It was the principal fodder used in the stables of the kings of Persia. From Persia, it is thought, it was brought to Greece about 470 B. C., and that its cultivation in Italy began at least two centuries before the Christian era. Several Roman writers, as Virgil, Columella and Varro, mention it. From Italy it was introduced into Spain and from Spain it was doubtless carried by missionaries of the Roman Catholic Church to Mexico and the South American States which lie west of the Andes, as Peru and Chili. In the arid and semi-arid regions of the Andes, the conditions were found so favorable to the growth of alfalfa that it is now the principal forage crop grown. It is almost certain that it was brought from Chili to California, from which it has spread over much of the cultivated portion of the arid and semi-arid west. Western grown seed is also the chief source of supply at the present time for all the States of the Union.
Fully a century ago attempts were made by Chancellor Livingstone and others to introduce it into the Eastern States, but without much success, owing, probably, to the lack of knowledge on the part of the people as to how it should be grown. The seed at that time was doubtless brought from European sources, probably France. It has been noticed by more recent growers in these States that the results from sowing such seed do not prove as satisfactory as those from American grown seed, but that alone should not sufficiently explain why the attempts to grow alfalfa just referred to were not successful.