A COMMON WEED IN IMPORTED ALFALFA SEED
“It remains to mention the most common weed found in imported alfalfa seed—the English or Ribbed plantain, or, as it is more generally called in the West, Buck-horn or Rib grass. It is a difficult weed to eradicate, lots of seed containing any noticeable percentage of it should be rejected. (See [illus.] opp. p. 13.)
“The farmer is often to blame for the poor seed of which he makes complaint. Prime alfalfa seed is expensive, and a cheap grade will inevitably be poor in quality, containing much dead seed, rubbish, and the seeds of many kinds of weeds. Where ‘cheap’ alfalfa seed is demanded it will always be sold, and buyers need not be surprised by its quality. On the other hand, there is no excuse or palliation for the offense of selling, under the name and at the price of standard alfalfa seed, seed of substituted species. It is the duty of seed dealers to ascertain beforehand the character and genuineness of seed that they sell under any given name, and this applies to the retailers as well as to the wholesale dealers. On the other hand, farmers cannot expect to obtain the best seed unless they are willing to pay the price it brings.”
DODDER SEED
Dodder seeds are somewhat smaller than alfalfa seeds ([pp. 45] and [47]), but are not separated from them except by careful recleaning; consequently, they are often sown along with the alfalfa seed, especially in that which has been imported. If a field is badly infested, it should be plowed up and devoted to some other crop for a few years. Prof. F. H. Hillman of Nevada (Bul. No. 47) says there are several kinds that infest alfalfa, but two kinds are especially common and destructive in this country. Cuscuta epithymum is the commoner. “The seeds of this ([p. 47]) are very small, and are almost sure to escape detection on casual examination of the samples; yet, once recognized under the lens, their presence may be easily discovered. They are so much smaller than alfalfa seeds that the use of a sieve of twenty meshes per inch separates them from the latter when only free dodder seeds are present. Not only are various other small weed seeds disposed of in the process, but little if any alfalfa seed worth buying is lost. The few ripened flowers of dodder retaining matured seeds, which sometimes pass the thresher uninjured, may be removed by proper fanning. It is safe to say that no purchaser of alfalfa seed can afford to neglect sifting his seed carefully with a twenty-mesh sieve, which is the mesh the writer recommends for the separation of this kind of dodder from alfalfa seed.
“Cuscuta arvensis is another dodder as destructive when once established. Its seeds ([p. 47]) seem to be less common, however. They are larger than the preceding, many of them being practically the same size as the smaller, more rounded alfalfa seeds, which they often strikingly resemble. Thus they are hard to detect, and cannot be removed without the loss of much small alfalfa seed. This should be the more dreaded of the two dodders, because alfalfa seed infested with seeds of Cuscuta epithymum can be made practically free from them with comparatively little loss and expense. Not so, however, with seed containing Cuscuta arvensis, which should not be purchased at any price. Dodder seeds can scarcely be regarded as an adulterant, yet as an impurity they are very common and most objectionable.” (See illustrations opp. [pp. 45], [46] and [47].)
CHAPTER V.
Soil and Seeding
VARIATE, YET UNIFORM
In this double title we have a case of the widest variations and the most positive and rigid uniformity. Alfalfa may be grown in almost every possible kind of soil and under almost all soil conditions (save two), but omitting these the seeding, including the tilth of the ground, is based, so far as any future success is concerned, on perfect cultivation. The dictum, “Alfalfa must have a dry, warm, sandy loam, very rich” has become obsolete, as already pointed out.
There are just two soil conditions that seem absolutely against the growth of alfalfa. The first is a soil constantly wet. The common remark, “Alfalfa will not stand ‘wet feet’,” seems to be the expression of a law. It does not do well where the water is nearer to the surface than six feet, or where in winter water will stand on the ground for over forty-eight hours. This invariably smothers the plants; in fact it usually kills any crop. If water flows over the field for some such time, due to a freshet, the alfalfa is often found uninjured if too much soil has not been deposited on and around the plants. Even in such instances fields have been saved by a disking once or twice, but it is wholly unwise to sow on a field subject to overflow, or one where water rises to the surface in winter or spring; likewise on a field so flat that water will not run off in time of a heavy rain or promptly drain out through the sub-surface. The time is rapidly coming everywhere when the intelligent farmer will not try to raise any crop on such a field, undrained. The alfalfa roots will find their way to moisture if given the right surface conditions. There are profitable alfalfa meadows in parts of Kansas where it is eighty feet to water, but there has not yet been found one that is prosperous where water comes close to the surface, or where it stands on the ground in winter.