To raise from seed, gather the balls after they have matured, hang them in a dry place till they become quite soft, when separate the seeds and dry them as others, and plant as early as the temperature of the soil favors vegetation. Chance varieties from seed of balls left to decay in the fall, as tomatoes, are recorded. Probably our present best varieties had such an origin. Raising new varieties requires much care and patience. Keep each one separate, plant only the best, and then you must wait four or five years to determine whether, out of a thousand, you have one good variety.
Varieties.—These are numerous. Those best adapted to one locality, are often inferior in another. That excellent potato, the Carter, so firm in New England and western New York, is ill-shapen and inferior in many localities in Illinois. The Neshannock or common Mercer produces a larger yield in Illinois than in the Eastern states, but of a slightly inferior quality. Most seeds do better transported from a colder to a warmer climate, but with the potato the reverse is true. The best potatoes of Ireland are usually inferior in the warmer latitudes of this country. In ordering potatoes for seed it is better to describe the quality than to order by the name. We omit any list, of even the best varieties. They are known by different names, and are not equally good in all localities. And all varieties are scattered over the whole country, very soon, by dealers, and through the agency of agricultural societies and periodicals. Different varieties should be kept separate, as they look better for market, and no two will cook in precisely the same time.
Plant the large potatoes and plant them whole. From a small eye or a small potato to the largest they will vegetate equally well. And in a wet, cool season, the small seed will produce nearly as good a crop as the large. But the large seed matures earlier, and in a dry season produces a much larger crop. The moisture in a large potato decaying in the hill, is of great use to the growing plants, in a dry season. It is also generally conceded that potatoes growing from cut seed are more liable to be affected by the rot.
Quantity of seed per acre.—The practices of farmers vary from five to twenty bushels. It takes a less number of bushels per acre when the seed is cut. The quantity is also affected by the size of the seed, the larger the potatoes the more will it take to seed an acre.
Plentiful, but not excessive, seeding is best. It is a universal fact that you can never get something for nothing. Hence light seeding will bring a light yield. We think it best to put one good-sized potato in a place and make the rows three feet apart each way. We think they yield better than at any other distances or in any other way. We have often tried drills, and found them more trouble, with no greater yield. The soil should be disintegrated to the depth of sixteen inches and the potatoes planted four inches deep, and cultivated with subsoil plow, and other suitable tools, in a manner to leave the surface nearly flat. Hilling up potatoes never does any good. We advise always to harrow the crop, as soon as they begin to appear through the soil.
Soil.—Any good rich garden soil is good for this crop, provided it be well drained. Potatoes like moisture, but are ruined by having water stand in the soil. New land and newly broken-up old pastures are best.
Manures.—All the usual fertilizers are good for potatoes, but especially ashes and plaster. The application above all others, for potatoes, is potash. Dissolve it in water, making it quite weak, and saturate your other manures with it, and the effect will always be marked. The tops contain a great deal of potash, and should always be plowed in and decay in the soil where they grow, otherwise they will rapidly exhaust the land. It is supposed that nothing will do more to restore the former vigor and health of the potato than a liberal application of potash in the soil in which they grow. The crop will be much increased in a dry season by manuring in the hill, dropping the potato first and putting the manure on the top of it.
Gathering and Preserving.—The usual hand-digging with hoe or potato-fork are well known, and do well when the crop is not large. But for those who grow potatoes for market, it is better to employ the plow in digging. Modern inventions for this purpose can everywhere be found in the agricultural warehouses. Potatoes are well preserved in a good cool cellar, in boxes or barrels; and are better for being covered with moist sand. The usual method of burying them outdoor is effectual and safe, if they be covered beyond the reach of frost, and have a small airhole at the apex, filled with straw.
The Potato Disease.—This is altogether atmospherical. A new piece of land was cleared for potatoes. In the middle was a close muck, on a coarse, gravelly subsoil. In the lowest place a ditch was dug, to carry off the superabundance of water; from that ditch the coarse gravel was thrown out on one side, and suffered to remain at considerable depth. Only two or three rods distant, on one side the plat extended over a knoll of loose sand. Potatoes were planted, from the same seed, at the same time, and in the same manner, on these three kinds of land, side by side. They were all tended alike, needing little hoeing or care, the land being new. The rot prevailed badly that season. On digging the potatoes, it was found that in the coarse gravel, where the air could circulate almost as freely as in a pile of stove-wood, all the potatoes were rotten: on the muck, which was unlike a peat-bog, very fine and tight, almost impervious to the atmosphere, they were nearly all sound; on the sand, which was quite open, but tighter than the gravel, part were decayed and the rest sound. Their condition was graduated entirely by the condition of the soil. It is an apparent objection to this theory, that when the rot prevails, the best potatoes are raised on light, sandy soils. It is said that they are open to the action of air. To this it is replied, that whether they rot or not, in sandy soils, depends on the kind of sand. On some sand they rot very badly, on others hardly at all. Sandy soils differ very materially: some are almost pure silex; while others are filled with a fine dust, and, although apparently loose, are much more nearly impervious to the air than heavier soils; on the former, nearly all will decay, and on the latter, most will be preserved.
Look at the immense potato crops near Rochester, N. Y., on sandy land. We have personally examined it, and find it to be filled with dust, that excludes the air, and saves the potato from rot. Why, then, is a heavy clay useless for potatoes? Is not clay a very tight soil? Unbroken it is; but, when plowed, it is always left in larger particles than other land—it is but seldom pulverized. The spaces between the particles are all open to the free action of the air; hence, instead of being close, it is one of the most open of all our soils. This confirms the theory.