THE GENESIS OF SOIL.

Soil primarily had its beginning from rock together with animal and vegetable decay, if you can imagine long stretches or periods of time when great rock masses were crumbling and breaking up. Heat, water action, and friction were largely responsible for this. By friction here is meant the rubbing and grinding of rock mass against rock mass. Think of the huge rocks, a perfect chaos of them, bumping, scraping, settling against one another. What would be the result? Well, I am sure you all could work that out. This is what happened: bits of rock were worn off, a great deal of heat was produced, pieces of rock were pressed together to form new rock masses, some portions becoming dissolved in water. Why, I myself, almost feel the stress and strain of it all. Can you? Then, too, there were great changes in temperature. First everything was heated to a high temperature, then gradually became cool. Just think of the cracking, the crumbling, the upheavals, that such changes must have caused! You know some of the effects in winter of sudden freezes and thaws. But the little examples of bursting water pipes and broken pitchers are as nothing to what was happening in the world during those days. The water and the gases in the atmosphere helped along this crumbling work. From all this action of rubbing, which action we call mechanical, it is easy enough to understand how sand was formed. This represents one of the great divisions of soil sandy soil. The sea shores are great masses of pure sand. If soil were nothing but broken rock masses then indeed it would be very poor and unproductive. But the early forms of animal and vegetable life decaying became a part of the rock mass and a better soil resulted. So the soils we speak of as sandy soils have mixed with the sand other matter, sometimes clay, sometimes vegetable matter or humus, and often animal waste. Clay brings us right to another class of soils clayey soils. It happens that certain portions of rock masses became dissolved when water trickled over them and heat was plenty and abundant. This dissolution took place largely because there is in the air a certain gas called carbon dioxide or carbonic acid gas. This gas attacks and changes certain substances in rocks. Sometimes you see great rocks with portions sticking up looking as if they had been eaten away. Carbonic acid did this. It changed this eaten part into something else which we call clay. A change like this is not mechanical but chemical. The difference in the two kinds of change is just this: in the one case of sand, where a mechanical change went on, you still have just what you started with, save that the size of the mass is smaller. You started with a big rock, and ended with little particles of sand. But you had no different kind of rock in the end. Mechanical action might be illustrated with a piece of lump sugar. Let the sugar represent a big mass of rock. Break up the sugar, and even the smallest bit is sugar. It is just so with the rock mass; but in the case of a chemical change you start with one thing and end with another. You started with a big mass of rock which had in it a portion that became changed by the acid acting on it. It ended in being an entirely different thing which we call clay. So in the case of chemical change a certain something is started with and in the end we have an entirely different thing. The clay soils are often called mud soils because of the amount of water used in their formation. The third sort of soil which we farm people have to deal with is lime soil. Remember we are thinking of soils from the farm point of view. This soil of course ordinarily was formed from limestone. Just as soon as one thing is mentioned about which we know nothing, another comes up of which we are just as ignorant. And so a whole chain of questions follows. Now you are probably saying within yourselves, how was limestone first formed? At one time ages ago the lower animal and plant forms picked from the water particles of lime. With the lime they formed skeletons or houses about themselves as protection from larger animals. Coral is representative of this class of skeleton-forming animal. As the animal died the skeleton remained. Great masses of this living matter pressed all together, after ages, formed limestone. Some limestones are still in such shape that the shelly formation is still visible. Marble, another limestone, is somewhat crystalline in character. Another well-known limestone is chalk. Perhaps you'd like to know a way of always being able to tell limestone. Drop a little of this acid on some lime. See how it bubbles and fizzles. Then drop some on this chalk and on the marble, too. The same bubbling takes place. So lime must be in these three structures. One does not have to buy a special acid for this work, for even the household acids like vinegar will cause the same result. Then these are the three types of soil with which the farmer has to deal, and which we wish to understand. For one may learn to know his garden soil by studying it, just as one learns a lesson by study.

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THE CULTIVATION OF VEGETABLES.

Before taking up the garden vegetables individually, I shall outline the general practice of cultivation, which applies to all. The purposes of cultivation are three to get rid of weeds, and to stimulate growth by (1) letting air into the soil and freeing unavailable plant food, and (2) by conserving moisture. As to weeds, the gardener of any experience need not be told the importance of keeping his crops clean. He has learned from bitter and costly experience the price of letting them get anything resembling a start. He knows that one or two days' growth, after they are well up, followed perhaps by a day or so of rain, may easily double or treble the work of cleaning a patch of onions or carrots, and that where weeds have attained any size they cannot be taken out of sowed crops without doing a great deal of injury. He also realizes, or should, that every day's growth means just so much available plant food stolen from under the very roots of his legitimate crops. Instead of letting the weeds get away with any plant food, he should be furnishing more, for clean and frequent cultivation will not only break the soil up mechanically, but let in air, moisture and heat all essential in effecting those chemical changes necessary to convert non- available into available plant food. Long before the science in the case was discovered, the soil cultivators had learned by observation the necessity of keeping the soil nicely loosened about their growing crops. Even the lanky and untutored aborigine saw to it that his squaw not only put a bad fish under the hill of maize but plied her shell hoe over it. Plants need to breathe. Their roots need air. You might as well expect to find the rosy glow of happiness on the wan cheeks of a cotton-mill child slave as to expect to see the luxuriant dark green of healthy plant life in a suffocated garden. Important as the question of air is, that of water ranks beside it. You may not see at first what the matter of frequent cultivation has to do with water. But let us stop a moment and look into it. Take a strip of blotting paper, dip one end in water, and watch the moisture run up hill, soak up through the blotter. The scientists have labeled that "capillary attraction" the water crawls up little invisible tubes formed by the texture of the blotter. Now take a similar piece, cut it across, hold the two cut edges firmly together, and try it again. The moisture refuses to cross the line: the connection has been severed. In the same way the water stored in the soil after a rain begins at once to escape again into the atmosphere. That on the surface evaporates first, and that which has soaked in begins to soak in through the soil to the surface. It is leaving your garden, through the millions of soil tubes, just as surely as if you had a two-inch pipe and a gasoline engine, pumping it into the gutter night and day! Save your garden by stopping the waste. It is the easiest thing in the world to do cut the pipe in two. By frequent cultivation of the surface soil not more than one or two inches deep for most small vegetables the soil tubes are kept broken, and a mulch of dust is maintained. Try to get over every part of your garden, especially where it is not shaded, once in every ten days or two weeks. Does that seem like too much work? You can push your wheel hoe through, and thus keep the dust mulch as a constant protection, as fast as you can walk. If you wait for the weeds, you will nearly have to crawl through, doing more or less harm by disturbing your growing plants, losing all the plant food (and they will take the cream) which they have consumed, and actually putting in more hours of infinitely more disagreeable work. If the beginner at gardening has not been convinced by the facts given, there is only one thing left to convince him experience. Having given so much space to the reason for constant care in this matter, the question of methods naturally follows. Get a wheel hoe. The simplest sorts will not only save you an infinite amount of time and work, but do the work better, very much better than it can be done by hand. You can grow good vegetables, especially if your garden is a very small one, without one of these labor-savers, but I can assure you that you will never regret the small investment necessary to procure it. With a wheel hoe, the work of preserving the soil mulch becomes very simple. If one has not a wheel hoe, for small areas very rapid work can be done with the scuffle hoe. The matter of keeping weeds cleaned out of the rows and between the plants in the rows is not so quickly accomplished. Where hand-work is necessary, let it be done at once. Here are a few practical suggestions that will reduce this work to a minimum, (1) Get at this work while the ground is soft; as soon as the soil begins to dry out after a rain is the best time. Under such conditions the weeds will pull out by the roots, without breaking off. (2) Immediately before weeding, go over the rows with a wheel hoe, cutting shallow, but just as close as possible, leaving a narrow, plainly visible strip which must be hand- weeded. The best tool for this purpose is the double wheel hoe with disc attachment, or hoes for large plants. (3) See to it that not only the weeds are pulled but that every inch of soil surface is broken up. It is fully as important that the weeds just sprouting be destroyed, as that the larger ones be pulled up. One stroke of the weeder or the fingers will destroy a hundred weed seedlings in less time than one weed can be pulled out after it gets a good start. (4) Use one of the small hand-weeders until you become skilled with it. Not only may more work be done but the fingers will be saved unnecessary wear. The skilful use of the wheel hoe can be acquired through practice only. The first thing to learn is that it is necessary to watch the wheels only: the blades, disc or rakes will take care of themselves. The operation of "hilling" consists in drawing up the soil about the stems of growing plants, usually at the time of second or third hoeing. It used to be the practice to hill everything that could be hilled "up to the eyebrows," but it has gradually been discarded for what is termed "level culture"; and you will readily see the reason, from what has been said about the escape of moisture from the surface of the soil; for of course the two upper sides of the hill, which may be represented by an equilateral triangle with one side horizontal, give more exposed surface than the level surface represented by the base. In wet soils or seasons hilling may be advisable, but very seldom otherwise. It has the additional disadvantage of making it difficult to maintain the soil mulch which is so desirable. Rotation of crops. ------------------ There is another thing to be considered in making each vegetable do its best, and that is crop rotation, or the following of any vegetable with a different sort at the next planting. With some vegetables, such as cabbage, this is almost imperative, and practically all are helped by it. Even onions, which are popularly supposed to be the proving exception to the rule, are healthier, and do as well after some other crop, provided the soil is as finely pulverized and rich as a previous crop of onions would leave it. Here are the fundamental rules of crop rotation: (1) Crops of the same vegetable, or vegetables of the same family (such as turnips and cabbage) should not follow each other. (2) Vegetables that feed near the surface, like corn, should follow deep-rooting crops. (3) Vines or leaf crops should follow root crops. (4) Quick-growing crops should follow those occupying the land all season. These are the principles which should determine the rotations to be followed in individual cases. The proper way to attend to this matter is when making the planting plan. You will then have time to do it properly, and will need to give it no further thought for a year. With the above suggestions in mind, and put to use , it will not be difficult to give the crops those special attentions which are needed to make them do their very best.

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