Clovers and How to Grow Them

by Thomas Shaw

In the Northern and Atlantic States, also west of the Cascade Mountains, and in some parts of the South, alfalfa is frequently sown with a nurse crop, and under favorable conditions the results are usually satisfactory, if the nurse crop is not sown too thickly. The best nurse crops in the areas named are barley and winter rye, but oats will answer also, if sown thinly and cut for hay. It has also been sown quite successfully along with winter wheat in the spring and also with spring wheat. When sown with winter wheat or winter rye, it is usually advantageous to cover the seed well with the harrow. In many instances, however, even in these areas, it is thought better to sow the seed without a nurse crop, in order that the plants may have all the benefit from moisture and sunlight which it is possible to give them. This is specially desirable when the fear is present that they may succumb the first winter to the severity of the weather. As weeds grow rapidly along with the plants, the mower should be run over the field from one to three times during the season. If the mowing is done at the proper time, it will not be necessary to remove what has been cut off by the mower. It may be allowed to lie as a mulch on the land. But should the growth of weeds be excessive before the mowing is done, it would then be necessary to remove them, in order to avoid smothering the plants. The clipping back of the alfalfa plants is helpful, rather than hurtful. When not thus clipped back the leaves frequently assume a yellowish tint on the top of the plants, which gradually extends downward until the greater portion of the leaves may be thus affected. Such condition frequently betokens a lack of nitrogen, but it may also be induced by other causes. When it does appear, the mower should at once be used and also as often as it appears. As soon as mowed off the plants usually stool out, sending up fresh shoots more numerously. They thus form a crown, somewhat like the crown in clover plants. Root growth is also strengthened, and the plants are thus made much stronger for going into the winter. Each clipping during the season, of course, cuts down weeds and prevents them from making seed. If not thus clipped, they would frequently injure the crop more by shade and crowding than would a nurse crop. The mulch thus made through clipping back the plants is in many instances quite helpful to them, because of the check which it gives to the escape of ground moisture. There is some difference in the view held as to whether close clipping is preferable, but the balance of authority is in favor of reasonably close clipping.

Alfalfa is usually sown alone, but in some instances it maybe advantageous to sow more or less of some other kind or kinds of grass or clover along with it. When grown for hay it is usually preferable to sow the seed without admixture. But there may be instances in which medium red or alsike clover may improve the crop the first year or two that it is mown for hay. But where red clover grows much more vigorously than alfalfa the first season, it should not be thus sown in any considerable quantities, or the clover plants will injure the alfalfa plants by crowding and overshading. Nevertheless, alfalfa may frequently with profit form a considerable factor in clover grown as pasture.

Where the main purpose of sowing alfalfa is to provide pasture, various grasses and clovers may be sown along with it, and in varying quantities, according to the attendant conditions. The choice of the variety or varieties to sow along with the alfalfa should be based on the needs of the stock to be pastured, and on the degree of the vigor with which these grow and maintain themselves in the locality. In the Northern States and Eastern Canada timothy and Russian brome grass (Bromus inermis) may be chosen. In areas with Southern Illinois as a center, red top and timothy should be satisfactory. In the Southern States, the claims of orchard grass and tall oat grass would probably be paramount. In areas with Iowa as a center, nothing would be more suitable, probably, than Russian brome grass. In the mountain States, with Wyoming as a center, timothy and alsike clover would be suitable. In the dry upland country in Washington and Oregon, Russian brome grass or tall oat grass would answer the purpose. In many areas the plan of sowing clover chiefly with the alfalfa is a good one, providing the alfalfa is cut for a year or two, and is then grazed, as by that time grasses indigenous to the locality, or which grow well in the same, come in to such an extent as to form a very considerable proportion of the pasture. Blue grass frequently behaves thus in the North, and crab grass in the South.

The amounts of seed to sow will vary with the character of the soil and climate, with the use that is to be made of the alfalfa, and with the manner in which it is sown. On soils and in climates quite favorable to the growth of alfalfa it is common to sow more seed than in those with less adaptation, and with a view, probably, to check coarseness in the growth of the stems. If sown thinly in such areas, the rank growth which follows would be coarse. This explains why in the Western and mountain States more seed is usually sown than in the Eastern and Northern States. Averaging the whole country, 20 pounds of seed per acre is more frequently mentioned as the proper amount to sow than any other quantity. In the Northern States many growers sow 15 pounds per acre, and judging by the yield obtained, this amount of seed has proved satisfactory. Some growers even mention 10 to 12 pounds as satisfactory. The amounts last named are certainly too small for average conditions. Fifteen to 20 pounds may be fixed upon as the proper amounts to sow on soil in good condition for speedy germination. But many growers claim satisfactory results from sowing larger amounts of seed than those named. Under semi-arid conditions, where irrigation cannot be given, a moderate amount of seed will be more satisfactory than very thick seeding, as when sown too thickly the plants would suffer more from want of moisture than if sown more thinly. The aim should be to obtain a stand that will cover the ground evenly and as thickly as will admit of the vigorous growing of the plants. Because of the relatively long duration of the period of the growth of alfalfa fields, it is specially important that good stands shall be obtained at the first, and for the further reason that the plants will then be better able to contend with intruding weeds, the great bane of alfalfa meadows.

When alfalfa is grown mainly for seed, it should be more thinly sown than when it is grown for hay or soiling food. It has been noticed that when the plants stand thickly beyond a certain degree, they do not seed well. Twelve to 16 pounds have been mentioned as quite enough to sow for such production in the mountain States. Where both objects are important, medium thick sowing would be the most suitable.

When sown in combinations such as have been named above, it will be necessary to modify somewhat the amounts of alfalfa seed sown, according to the proportion of the other seeds sown with the alfalfa. But since many grasses are more aggressive than alfalfa, it is not necessary to reduce the amount of alfalfa seed sown proportionately to the amounts of the other seeds that may be sown along with it. In many instances it may be proper not to reduce the amount of the alfalfa seed at all, as some of these grasses will soon crowd the alfalfa plants, to their injury, even though the usual amount of seed should be sown. The amount of the grasses sown with the alfalfa will, of course, vary. It will seldom be necessary in any instance to sow more than 6 or 7 pounds per acre, and under many conditions not more than 5 pounds. When alfalfa is sown with timothy and clover in temporary meadows or pastures, it is seldom necessary to sow more than 3 to 5 pounds per acre, and the same is true of it when sown in a permanent pasture. The crop is so little grown for hay in mixtures, that it is scarcely necessary to dwell upon the nature of these, or the respective amounts of seed to sow in making them.

When alfalfa is sown with the grain, there will be a saving of seed to the extent of at least 20 per cent., as compared with broadcast sowing. This arises from the more general sprouting of all the seeds, since they are planted at a more uniform depth, and from the subsequent loss of a smaller percentage of the plants through drought, and it may be other causes. But when sowing broadcast, it will in many instances prove more satisfactory to add 20 per cent. to the amounts mentioned above, as suitable for being sown without admixture with other grasses and clovers, rather than to deduct 20 per cent. from these amounts when sowing the seed with the drill.

Cultivating.—Under some conditions, it is, in a sense, necessary to sow alfalfa in rows, and to give it cultivation during the first season and sometimes for a longer period. In some parts of Florida, for instance, the most satisfactory results have been obtained from sowing in rows with 12 to 24 inches between the rows, and then to cultivate between these as may be necessary to keep down the growth of weeds. Under some conditions also in the Atlantic States, the most satisfactory results have been obtained from sowing alfalfa in rows 14 to 16 inches apart and cultivating between them. Even hand hoeing the first season may be justifiable along the line of the rows for small areas, but with the price of labor as at present, would be too costly for large areas. When grown in rows as indicated in the Atlantic States and westward from these, the yields of seed have been more satisfactory than when sown broadcast, but the crop is less satisfactory for hay, owing to the coarse and uneven character of the stems. The amounts of seed wanted for such sowing will, of course, vary chiefly with the distance between the rows. As small an amount as 6 pounds or even less will in some instances suffice per acre.

Pasturing.—The practice of pasturing alfalfa the first season, especially where it cannot be irrigated, is usually condemned, lest it should weaken the plants unduly for entering the winter. It would seem probable, however, that under some conditions such grazing would be helpful rather than hurtful. The cropping of the plants by stock, in the influence which it exerts upon the plants, is akin to that which arises from cutting them back frequently during the summer. The animals thus grazed will also crop down weeds. This, at least, is true of sheep. The author has succeeded in getting a good stand of alfalfa by sowing seed at the rate of 15 pounds per acre, along with 2 to 4 pounds of Dwarf Essex rape seed, and grazing the same with sheep. Other growers, during recent years, have succeeded similarly. The grazing should not begin until the plants have made a good start, but it should not be deferred so long that the rape and the weeds will unduly shade the alfalfa plants. The pasturing should not be too close, nor should it be so long continued that the alfalfa plants will not be able to provide a good growth in the early autumn before the advent of winter.

The management of the spring-sown crop the first season requires careful attention in areas where the hazard exists in any considerable degree that the plants may take serious harm at that season, or, indeed, fail altogether. In Western areas, from Canada to Kentucky and Missouri, it is important that the stubbles of the grain shall be cut high, amid which alfalfa grows when it is sown with a nurse crop. When not thus sown, it is of prime importance that the plants shall stand up several inches above the surface of the ground before the advent of winter. This is specially important in States west of the Mississippi River. The objects effected are three-fold. First, the snow is arrested and held for the protection of the plants, and to furnish them with moisture when the snow melts. The extent to which the stubbles and the erect young alfalfa plants will hold snow is simply surprising. On the exposed prairies, the snow usually drifts so completely from unprotected lands, that during almost any winter a large proportion of the area will be quite bare. The melting of the snow thus held is also of much value to the crop in the moisture which it brings to it, especially in areas where the rainfall is less than normal. Second, the plants are thus protected from the sweep of the cold winds which blow so much of the season in the unprotected prairie, and which are frequently fatal to various winter crops. Third, they are also protected from the intensity of the frost, which may in some instances kill young alfalfa plants in areas northward.