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Home Vegetable Gardening Part 4

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Plant food is of as many kinds, or, more accurately speaking, in as many _forms_, as is food for human beings. But the first distinction to make in plant foods is that between available and non- available foods--that is, between foods which it is possible for the plant to use, and those which must undergo a change of some sort before the plant can take them up, a.s.similate them, and turn them into a healthy growth of foliage, fruit or root. It is just as readily possible for a plant to starve in a soil abounding in plant food, if that food is not available, as it would be for you to go unnourished in the midst of soups and tender meats if the latter were frozen solid.

Plants take all their nourishment in the form of soups, and very weak ones at that. Plant food to be available must be soluble to the action of the feeding root tubes; and unless it is available it might, as far as the present benefiting of your garden is concerned, just as well not be there at all. Plants take up their food through innumerable and microscopic feeding rootlets, which possess the power of absorbing moisture, and furnis.h.i.+ng it, distributed by the plant juices, or sap, to stem, branch, leaf, flower and fruit. There is one startling fact which may help to fix these things in your memory: it takes from 300 to 500 pounds of water to furnish food for the building of one pound of dry plant matter. You can see why plant food is not of much use unless it is available; and it is not available unless it is soluble.

THE THEORY OF MANURING

The food of plants consists of chemical elements, or rather, of numerous substances which contain these elements in greater or less degrees. There is not room here to go into the interesting science of this matter. It is evident, however, as we have already seen that the plants must get their food from the soil, that there are but two sources for such food: it must either be in the soil already, or we must put it there. The practice of adding plant food to the soil is what is called manuring.

The only three of the chemical elements mentioned which we need consider are: nitrogen, phosphoric acid, and potash. The average soil contains large amounts of all three, but they are for the most part in forms which are not available and, therefore, to that extent, may be at once dismissed from our consideration. (The non-available plant foods already in the soil may be released or made available to some extent by cultivation. See Chapter VII.) In practically every soil that has been cultivated and cropped, in long-settled districts, the amounts of nitrogen, phosphoric acid and potash which are immediately available will be too meager to produce a good crop of vegetables. It becomes absolutely necessary then, if one would have a really successful garden, no matter how small it is, to add plant foods to the soil abundantly. When you realize, (1) that the number of plant foods containing the three essential elements is almost unlimited, (2) that each contains them in different proportions and in differing degrees of availability, (3) that the amount of the available elements already in the soil varies greatly and is practically undeterminable, and (4) that different plants, and even different varieties of the same plant, use these elements in widely differing proportions; then you begin to understand what a complex matter this question of manuring is and why it is so much discussed and so little understood. What a labyrinth it offers for any writer--to say nothing of the reader--to go astray in!



I have tried to present this matter clearly. If I have succeeded it may have been only to make the reader hopelessly discouraged of ever getting at anything definite in the question of enriching the soil. In that case my advice would be that, for the time being, he forget all about it. Fortunately, in the question of manuring, a little knowledge is not often a dangerous thing. Fortunately, too, your plants do not insist that you solve the food problem for them. Set a full table and they will help themselves and take the right dishes. The only thing to worry about is that of the three important foods mentioned (nitrogen, phosphoric acid and potash) there will not be enough: for it has been proved that when any one of these is exhausted the plant practically stops growth; it will not continue to "fill up" on the other two. Of course there is such a thing as going to extremes and wasting plant foods, even if it does not, as a rule, hurt the plants. If, however, the fertilizers and manures described in the following sections are applied as directed, and as mentioned in Chapter VII., good results will be certain, provided the seed, cultivation and season are right.

VARIOUS MANURES

The terms "manure" and "fertilizer" are used somewhat ambiguously and interchangeably. Using the former term in a broad sense--as meaning any substance containing available plant food applied to the soil, we may say that manure is of two kinds: organic, such as stable manure, or decayed vegetable matter; and inorganic, such as potash salts, phosphatic rock and commercial mixed fertilizers. In a general way the term "fertilizer" applies to these inorganic manures, and I shall use it in this sense through the following text.

Between the organic manures, or "natural" manures as they are often called, and fertilizers there is a very important difference which should never be lost sight of. In theory, and as a chemical fact too, a bag of fertilizer may contain twice the available plant food of a ton of well rotted manure; but out of a hundred practical gardeners ninety- nine--and probably one more--would prefer the manure. There is a reason why--two reasons, even if not one of the hundred gardeners could give them to you. First, natural manures have a decided physical effect upon most soils (altogether aside from the plant food they contain); and second, plants seem to have a preference as to the _form_ in which their food elements are served to them. Fertilizers, on the other hand, are valuable only for the plant food they contain, and sometimes have a bad effect upon the physical condition of the soil.

When it comes right down to the practical question of what to put on your garden patch to grow big crops, nothing has yet been discovered that is better than the old reliable stand-by--well rotted, thoroughly fined stable or barnyard manure. Heed those adjectives! We have already seen that plant food which is not available might as well be, for our immediate purposes, at the North Pole. The plant food in "green" or fresh manure is not available, and does not become so until it is released by the decay of the organic matters therein. Now the time possible for growing a crop of garden vegetables is limited; in many instances it is only sixty to ninety days. The plants want their food ready at once; there is no time to be lost waiting for manure to rot in the soil. That is a slow process--especially so in clayey or heavy soils. So on your garden use only manure that is well rotted and broken up. On the other hand, see that it has not "fire-fanged" or burned out, as horse manure, if piled by itself and left, is very sure to do. If you keep any animals of your own, see that the various sorts of manure --excepting poultry manure, which is so rich that it is a good plan to keep it for special purposes--are mixed together and kept in a compact, built-up square heap, not a loose pyramidal pile. Keep it under cover and where it cannot wash out. If you have a pig or so, your manure will be greatly improved by the rooting, treading and mixing they will give it. If not, the pile should be turned from bottom to top and outside in and rebuilt, treading down firmly in the process, every month or two-- applying water, but not soaking, if it has dried out in the meantime.

Such manure will be worth two or three times as much, for garden purposes, as that left to burn or remain in frozen lumps. If you have to buy all your manure, get that which has been properly kept; and if you are not familiar with the condition in which it should be, get a disinterested gardener or farmer to select it for you. When possible, it will pay you to procure manure several months before you want to use it and work it over as suggested above. In buying manure keep in mind not what animals made it, but what food was fed--that is the important thing. For instance, the manure from highly-fed livery horses may be, weight for weight, worth three to five times that from cattle wintered over on poor hay, straw and a few roots.

There are other organic manures which it is sometimes possible for one to procure, such as refuse brewery hops, fish sc.r.a.ps and sewage, but they are as a rule out of the reach of, or objectionable for, the purposes of the home gardener.

There are, however, numerous things constantly going to waste about the small place, which should be converted into manure. Fallen leaves, gra.s.s clippings, vegetable tops and roots, green weeds, garbage, house slops, dish water, chip dirt from the wood-pile, shavings--any thing that will rot away, should go into the compost heap. These should be saved, under cover if possible, in a compact heap and kept moist (never soaked) to help decomposition. To start the heap, gather up every available substance and make it into a pile with a few wheelbarrows full, or half a cartload, of fresh horse manure, treading the whole down firmly. Fermentation and decomposition will be quickly started.

The heap should occasionally be forked over and restacked. Light dressings of lime, mixed in at such times, will aid thorough decomposition.

Wood ashes form another valuable manure which should be carefully saved. Beside the plant food contained, they have a most excellent effect upon the mechanical condition of almost every soil. Ashes should not be put in the compost heap, because there are special uses for them, such as dusting on squash or melon vines, or using on the onion bed, which makes it desirable to keep them separate. Wood ashes may frequently be bought for fifty cents a barrel, and at this price a few barrels for the home garden will be a good investment.

Coal ashes contain practically no available plant food, but are well worth saving to use on stiff soils, for paths, etc.

VALUE OF GREEN MANURING

Another source of organic manures, altogether too little appreciated, is what is termed "green manuring"--the plowing under of growing crops to enrich the land. Even in the home garden this system should be taken advantage of whenever possible. In farm practice, clover is the most valuable crop to use for this purpose, but on account of the length of time necessary to grow it, it is useful for the vegetable garden only when there is sufficient room to have clover growing on, say, one half- acre plot, while the garden occupies, for two years, another half-acre; and then changing the two about. This system will give an ideal garden soil, especially where it is necessary to rely for the most part upon chemical fertilizers.

There are, however, four crops valuable for green-manuring the garden, even where the same spot must be occupied year after year: rye, field corn, field peas (or cow peas in the south) and crimson clover. After the first of September, sow every foot of garden ground cleared of its last crop, with winter rye. Sow all ground cleared during August with crimson clover and buckwheat, and mulch the clover with rough manure after the buckwheat dies down. Sow field peas or corn on any spots that would otherwise remain unoccupied six weeks or more. All these are sown broadcast, on a freshly raked surface. Such a system will save a very large amount of plant food which otherwise would be lost, will convert unavailable plant food into available forms while you wait for the next crop, and add _humus_ to the soil--concerning the importance of which see Chapter VII.

CHEMICAL FERTILIZERS

I am half tempted to omit entirely any discussion of chemical fertilizers: to give a list of them, tell how to apply them, and let the why and wherefore go. It is, however, such an important subject, and the home gardener will so frequently have to rely almost entirely upon their use, that probably it will be best to explain the subject as thoroughly as I can do it in very limited s.p.a.ce. I shall try to give the theory of scientific chemical manuring in one paragraph.

We have already seen that the soil contains within itself some available plant food. We can determine by chemical a.n.a.lysis the exact amounts of the various plant foods--nitrogen, phosphoric acid, potash, etc.--which a crop of any vegetable will remove from the soil. The idea in scientific chemical manuring is to add to the available plant foods already in the soil just enough more to make the resulting amounts equal to the quant.i.ties of the various elements used by the crop grown.

In other words:

) Available plant food elements in ( the soil, plus > == Amounts of food elements Available chemical food elements ( in matured crop supplied in fertilizers )

That was the theory--a very pretty and profound one! The discoverers of it imagined that all agriculture would be revolutionized; all farm and garden practice reduced to an exact science; all older theories of husbandry and tillage thrown by the heels together upon the sc.r.a.p heap of outworn things. Science was to solve at one fell swoop all the age- old problems of agriculture. And the whole thing was all right in every way but one--it didn't work. The unwelcome and obdurate fact remained that a certain number of pounds of nitrogen, phosphoric acid and potash--about thirty-three--in a ton of good manure would grow bigger crops than would the same number of pounds of the same elements in a bag of chemical fertilizer.

Nevertheless this theory, while it failed as the basis of an exact agricultural science, has been developed into an invaluable guide for using all manures, and especially concentrated chemical manures. And the above facts, if I have presented them clearly, will a.s.sist the home gardener in solving the fertilizer problems which he is sure to encounter.

VARIOUS FERTILIZERS

What are termed the raw materials from which the universally known "mixed fertilizers" are made up, are organic or inorganic substances which contain nitrogen, phosphoric acid or potash in fairly definite amounts.

Some of these can be used to advantage by themselves. Those practical for use by the home gardener, I mention. The special uses to which they are adapted will be mentioned in Part Two, under the vegetables for which they are valuable.

GROUND BONE is rich in phosphate and lasts a long time; what is called "raw bone" is the best "Bone dust" or "bone flour" is finely pulverized; it will produce quick results, but does not last as long as the coa.r.s.er forms.

COTTON-SEED MEAL is one of the best nitrogenous fertilizers for garden crops. It is safer than nitrate of soda in the hands of the inexperienced gardener, and decays very quickly in the soil.

PERUVIAN GUANO, in the pure form, is now practically out of the market.

Lower grades, less rich in nitrogen especially, are to be had; and also "fortified" guano, in which chemicals are added to increase the content of nitrogen. It is good for quick results.

NITRATE OF SODA, when properly handled, frequently produces wonderful results in the garden, particularly upon quick-growing crops. It is the richest in nitrogen of any chemical generally used, and a great stimulant to plant growth. When used alone it is safest to mix with an equal bulk of light dirt or some other filler. If applied pure, be sure to observe the following rules or you may burn your plants: (1) Pulverize all lumps; (2) see that none of it lodges upon the foliage; (3) never apply when there is moisture upon the plants; (4) apply in many small doses--say 10 to 20 pounds at a time for 50 x 100 feet of garden. It should be put on so sparingly as to be barely visible; but its presence will soon be denoted by the moist spot, looking like a big rain drop, which each particle of it makes in the dry soil. Nitrate of soda may also be used safely in solution, at the rate of 1 pound to 12 gallons of water. I describe its use thus at length because I consider it the most valuable single chemical which the gardener has at command.

MURIATE and SULPHATE OF POTASH are also used by themselves as sources of potash, but as a general thing it will be best to use them in combination with other chemicals as described under "Home Mixing."

LIME will be of benefit to most soils. It acts largely as an indirect fertilizer, helping to release other food elements already in the soil, but in non-available forms. It should be applied once in three to five years, at the rate of 75 to 100 bushels per acre, after plowing, and thoroughly harrowed in. Apply as long before planting as possible, or in the fall.

MIXED FERTILIZERS

Mixed fertilizers are of innumerable brands, and for sale everywhere.

It is little use to pay attention to the claims made for them. Even where the a.n.a.lysis is guaranteed, the ordinary gardener has no way of knowing that the contents of his few bags are what they are labeled.

The best you can do, however, is to buy on the basis of a.n.a.lysis, not of price per ton--usually the more you pay per bag, the cheaper you are really buying your actual plant food. Send to the Experiment Station in your State and ask for the last bulletin on fertilizer values. It will give a list of the brands sold throughout the State, the retail price per ton, and the actual value of plant foods contained in a ton. Then buy the brand in which you will apparently get the greatest value.

For garden crops the mixed fertilizer you use should contain (about):

) Nitrogen, 4 per cent. ( Basic formula Phosphoric acid, 8 per cent. > == for Potash, 10 per cent. ( Garden crops )

If applied alone, use at the rate of 1000 to 1500 pounds per acre. If with manure, less, in proportion to the amount of the latter used.

By "basic formula" (see above) is meant one which contains the plant foods in the proportion which all garden crops must have. Particular crops may need additional amounts of one or more of the three elements, in order to attain their maximum growth. Such extra feeding is usually supplied by top dressings, during the season of growth. The extra food beneficial to the different vegetables will be mentioned in the cultural directions in Part Two.

HOME MIXING

If you look over the Experiment Station report mentioned above, you will notice that what are called "home mixtures" almost invariably show a higher value compared to the cost than any regular brand. In some cases the difference is fifty per cent. This means that you can buy the raw chemicals and make up your own mixtures cheaper than you can buy mixed fertilizers. More than that, it means you will have purer mixtures. More than that, it means you will have on hand the materials for giving your crops the special feeding mentioned above. The idea widely prevails, thanks largely to the fertilizer companies, that home mixing cannot be practically done, especially upon a small scale. From both information and personal experience I know the contrary to be the case. With a tight floor or platform, a square-pointed shovel and a coa.r.s.e wire screen, there is absolutely nothing impractical about it.

The important thing is to see that all ingredients are evenly and thoroughly mixed. A scale for weighing will also be a convenience.

Further information may be had from the firms which sell raw materials, or from your Experiment Station.

APPLYING MANURES

The matter of properly applying manure, even on the small garden, is also of importance. In amount, from fifteen to twenty-five cords, or 60 to 100 cartloads, will not be too much; although if fertilizers are used to help out, the manure may be decreased in proportion. If possible, take it from the heap in which it has been rotting, and spread evenly over the soil immediately before plowing. If actively fermenting, it will lose by being exposed to wind and sun. If green, or in cold weather, it may be spread and left until plowing is done. When plowing, it should be completely covered under, or it will give all kinds of trouble in sowing and cultivating.

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Home Vegetable Gardening Part 4 summary

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