Farm drainage Part 25

The ingenuity of farmers in the use of a pair of heavy wheels, with a chain attached to the axle, so that the cattle may both walk on one side of the ditch, or by the use of long double-trees, so that horses may go outside the banks of earth, will generally be found sufficient to make the most of their means.

It will be found convenient to place the soil at one side, and the subsoil at the other, for convenience in returning both right side up to their places.

Having worked down to the depth of two feet or more, the ditch should be too narrow for the use of common spades, and the narrow tools already described will be found useful. The Irish spade, on our own fields, is in use from the first to the last of the excavation; and at three feet depth, we have our trench but about six inches in width, and at the bottom, at four feet depth, it is but four inches--just wide enough for the laborer to stand in it, with one foot before the other.

Having excavated to nearly our depth, we use the lines, as described in another place, for levelling, and the men working under them, grade the bottom as accurately as possible. If flat-bottomed tiles are used, the ditch is ready for them. If round pipes are used, a round bottoming tool must be used to form a semi-circular groove in which the pipes are to lie.

We have not forgotten that English drainers tell us of tools and their use, whereby drains may be open twenty inches lower than the feet of the workman; but we have never chanced to see that operation, and are skeptical as to the fact that work can thus be performed economically, except in very peculiar soils. That such a _crack_ may be thus opened, is not doubted; but we conceive of no means by which earth, that requires the pick, can be moved to advantage, without the workman standing as low as his work.

Having opened the main, and finished, as we have described, the minor which enters the main at its highest point, we are ready to lay the tiles.

By first laying the upper drain, it will be seen that we may finish and secure our work to the junction of the first minor with its main.

Convey the pipes by wagon or otherwise, as is convenient, to the side of the ditch where the soil lies, and where there is least earth, and lay them close to the edge of the ditch, end to end the whole way, discarding all imperfect pieces. If it is designed to use gravel, turf, or other covering for the pipes, lay it also in heaps along the trench.

Then place the first pipe at the upper end of the ditch, with a brick or stone against its upper end, to exclude earth. We have heretofore used sole-tiles, with flat bottoms, and have found that a thin chip of wood, not an eighth of an inch thick, and four by two inches in size, such as may be found at shoe shops in New England, a.s.sists very much in securing an even bearing for the tiles. It is placed so that the ends of two tiles rest on it, and serves to keep them in line till secured by the earth. A man walking backward in the ditch, takes the tiles from the bank, carefully adjusting them in line and so as to make good joints, and he can lay half a mile or more in a day, if the bottom is well graded. Another should follow on the bank, throwing in a shovel full of gravel or tan, if either is used, upon the joint.

If turf is to be used to secure the joint, pieces should be cut thin and narrow, and laid along the bank, and the man in the ditch must secure each joint as he proceeds. It will be found to cost twice the labor, at least, to use turf, as it is to use gravel or tan, if they are at hand.

If the soil be clay, we do not believe it is best to return it directly upon the tiles, because it is liable to puddle and stop the joint, and then to crack and admit silt at the joint, while gravel is not thus affected. We prefer to place the top soil of clay land, next the pipes, rather than the clay in the condition in which it is usually found.

As to small stones above the pipes, we should decidedly object to them.

They are unnecessary to the operation of the drain, and they allow the water to come in, in currents, on to the top of the pipes, in heavy storms or showers, and so endanger their security. The practice of placing stones above the tiles is abandoned by all scientific drainers.

We have, in England, seen straw placed over the joints of pipes, but it seems an inconvenient and insecure practice. Long straw cannot be well placed in such narrow openings, and it is likely to sustain the earth enough, so that when thrown in, it will not settle equally around the pipes; whereas a shovelfull of gravel or other earth sifted in carefully, will at once fasten them in place.

Having laid and partially covered the first or upper drain, proceed with the next in the same way, laying and securing the main or sub-main, at the same time, to each intersection, thus carrying the work from the highest point down towards the outlet. After sufficient earth has been thrown in to make the work safe against accidents by rain, or caving in of earth, the filling may be completed at leisure. Mr. Johnston, of Geneva, uses for this purpose a plow, having a double-tree nine and a half feet long, to enable a horse to go on each side of the ditch.

We suggest that a side-hill plow might well enough be used with horses _tandem_, or with oxen and cart wheels and draughts.

The filling, however, will be found a small matter, compared with the digging. In laying pipes in narrow trenches, a tool called a pipe-layer is sometimes used, a cut of which, showing its mode of use, may be found in another place.

In filling drains where the soil is partly clay, and partly sand or gravel, we recommend that the clay be placed in the upper part of the drain, so as to prevent water from pa.s.sing directly down upon the pipes, by which they are frequently displaced as soon as laid.

If the work is completed in Autumn, it is well to turn two or three furrows from each side on to the drains, so as to raise the surface there, and prevent water from cutting out the ditch, or standing above it. If the land is plowed in Autumn, it is best to back-furrow on to the drains, leaving dead furrows half way between them, the first season.

As to the importance of securing the outlets, and the manner of doing it, we have spoken particularly elsewhere.

And here, again, we will remind the beginner, of the necessity of making and preserving accurate plans of the work, so that every drain may be at any time found by measurement. After a single rotation, it is frequently utterly impossible to perceive upon the surface any indication of the line of the drains.

In this connection, it may be well perhaps to remind the reader, that whatever arrangements are made as to silt-basins, or peep-holes, must be included in the general plan, and executed as the work proceeds.

CHAPTER XIII.

EFFECTS OF DRAINAGE UPON THE CONDITION OF THE SOIL.

Drainage deepens the Soil, and gives the roots a larger pasture.--Cobbett's Lucerne 30 feet deep.--Mechi's Parsnips 13 feet long!--Drainage promotes Pulverization.--Prevents Surface-Was.h.i.+ng.--Lengthens the Season.--Prevents Freezing out.--Dispenses with Open Ditches.--Saves 25 per cent. of Labor.--Promotes absorption of Fertilizing Substances from the Air.--Supplies Air to the Roots.--Drains run before Rain; so do some Springs.--Drainage warms the Soil.--Corn sprouts at 55; Rye on Ice.--Cold from Evaporation.--Heat will not pa.s.s downward in Water.--Count Rumford's Experiments with Hot Water on Ice.--Aeration of Soil by Drains.

The benefits which high-lands, as we ordinarily call them, in distinction from swamp or flowed lands, derive from drainage, may be arranged in two cla.s.ses, _mechanical_ and _chemical_; though it is not easy, nor, indeed, is it important, to maintain this distinction in all points. Among those which partake rather of the nature of mechanical changes, are the following:

_Drainage deepens the soil._ Every one who has attempted to raise deep-rooted vegetables upon half-drained swamp-land, has observed the utter impossibility of inducing them to extend downward their usual length. Parsnips and carrots, on such land, frequently grow large at the top, but divide into numerous small fibres just below the surface, and spread in all directions. No root, except those of aquatic plants, will grow in stagnant water. If, therefore, it is of any advantage to have a deep, rather than a shallow soil, it is manifestly necessary, from this consideration alone, to lower the line of standing water, at least, to the extent to which the roots of our cultivated crops descend. A deep soil is better than a shallow one, because it furnishes a more extensive feeding-ground for the roots. The elements of nutrition, which the plant finds in the soil, are not all upon the surface. Many of them are washed down by the rains into the subsoil, and some are found in the decomposing rocks themselves. These, the plants, by a sort of instinct, search out and find, as well in the depths of the earth as at its surface, if no obstacle opposes. By striking deep roots again, the plants stand more firmly in the earth, so that they are not so readily drawn out, or shaken by the winds. Indeed, every one knows that a soil two feet deep is better than one a foot deep; and market-gardeners and nursery-men show, by their practice, that they know, if others do not, that a trenched soil three feet deep is better than one of any less depth. We all know that Indian corn, in a dry soil, sends down its rootlets two feet or more, as well as most of the gra.s.ses. Cobbett says: "The lucerne will send its roots thirty feet into a dry bottom!" The Chinese yam, recently introduced, grows downward two or three feet. The digging of an acre of such a crop, by the way, on New England soil generally, would require a corps of sappers and miners, especially when we consider that the yam grows largest end downward. However, the yam may prove a valuable acquisition to the country. Every inch of additional soil gives 100 tons of active soil per acre.

Says Mr. Denton:

"I have evidence now before me, that the roots of the wheat plant, the mangold wurzel, the cabbage, and the white turnip, frequently descend into the soil to the depth of three feet. I have myself traced the roots of wheat nine feet deep. I have discovered the roots of perennial gra.s.ses in drains four feet deep; and I may refer to Mr. Mercer, of Newton, in Lancas.h.i.+re, who has traced the roots of rye gra.s.s running for many feet along a small pipe-drain, after descending four feet through the soil. Mr. Hetley, of Orton, a.s.sures me that he discovered the roots of the mangolds, in a recently made drain, five feet deep; and the late Sir John Conroy had many newly-made drains, four feet deep, stopped by the roots of the same plants."

Mr. Sheriff Mechi's parsnips, however, distance anything in the way of deep rooting that has yet been recorded. The Sheriff is a very deep drainer, and an enthusiast in agriculture, and Nature seems to delight to humor his tastes, by performing a great many experiments at his famous place called Tiptree Hall. He stated, at a public meeting, that, in his neighborhood, where a crop of parsnips was growing on the edge of a clay pit, the roots were observed to descend 13 feet 6 inches; in fact, the whole depth to which this pit had once been filled up!

_Drainage a.s.sists pulverization._ It was Tull's theory that, by the comminution, or minute division, of soils alone, without the application of any manures, their fertility might be permanently maintained; and he so far supported this theory as, by repeated plowings, to produce twelve successive crops of wheat on the same land, without manure. The theory has received support from the known fact, that most soils are benefitted by Summer fallowing. The experiments inst.i.tuted for the purpose of establis.h.i.+ng this theory, although they disproved it, showed the great value of thorough pulverization. It is manifest that a wet soil can never be pulverized. Plowing clayey, or even loamy soil, when wet, tends rather to press it together, and render it less pervious to air and water.

The first effect of under-draining is to dry the surface-soil, to draw out all the water that will run out of it, so that, in early Spring, or in Autumn, it may be worked with the plow as advantageously as undrained lands in mid-Summer.

Striking ill.u.s.trations of the benefits of thorough pulverization will be found in the excellent remarks of Dr. Madden, given in a subsequent chapter.

_Drainage prevents surface-was.h.i.+ng._ All land which is not level, and is not in gra.s.s, is liable to great loss by heavy rains in Spring and Autumn. If the land is already filled with water, or has not sufficient drainage, the rain cannot pa.s.s directly downward, but runs away upon the surface, carrying with it much of the soil, and was.h.i.+ng out of what remains, of the valuable elements of fertility which have been applied with such expense. If the land be properly drained, the water falling from the clouds is at once absorbed, and pa.s.ses downwards, saturating the soil in its descent, and carrying the soluble substances with it to the roots, and the surplus water runs away in the artificial channels provided by the draining process. So great is the absorbent power of drained land, that, after a protracted drought, all the water of a heavy rainstorm will be drunk up and held by the soil, so that, for a day or two, none will find its way to the drains, nor will it run upon the surface.

_Drainage lengthens the season for labor and vegetation._ In the colder lat.i.tudes of our country, where a long Winter is succeeded by a torrid Summer, with very little ceremony by way of an intervening Spring, farmers have need of all their energy to get their seed seasonably into the ground. Snow often covers the fields in New England into April; and the ground is so saturated with water, that the land designed for corn and potatoes, frequently cannot be plowed till late in May. The manure is to be hauled from the cellar or yard, over land lifted and softened by frost, and all the processes of preparing and planting, are necessarily hurried and imperfect. In the Annual Report of the Secretary of the Board of Agriculture, of the State of Maine, for 1856, a good ill.u.s.tration of this idea is given: "Mr. B. F. Nourse, of Orrington, plowed and planted with corn a piece of his drained and subsoiled land, in a drizzling rain, after a storm of two days. The corn came up and grew well; yet this was a clayey loam, formerly as wet as the adjoining gra.s.s-field, upon which oxen and carts could not pa.s.s, on the day of this planting, without cutting through the turf and miring deeply. The nearest neighbor said, if he had planted that day, it must have been from a raft." Probably two weeks would be gained in New England, in Spring, in which to prepare for planting, by thorough-drainage, a gain, which no one can appreciate but a New England man, who has been obliged often to plow his land when too wet, to cut it up and overwork his team, in hauling on his manure over soft ground, and finally to plant as late as the 6th of June, or leave his manure to waste, and lose the use of his field till another season; and all because of a surplus of cold water.

Mr. Yeomans, of New York, in a published statement of his experience in draining, says, that on his drained lands, "the ground becomes almost as dry in two or three days after the frost comes out in Spring, or after a heavy rain, as it would do in as many weeks, before draining." But the gain of time for labor is not all. We gain time also for vegetation, by thorough-drainage. Ten days, frequently, in New England, may be the security of our corn-crop against frost. In less than that time, a whole field pa.s.ses from the milky stage, when a slight frost would ruin it, to the glazed stage, when it is safe from cold; and twice ten days of warm season are added by this removal of surplus water.

_Drainage prevents freezing out._ Mr. John Johnston, of Seneca County, New York, in 1851, had already made sixteen miles of tile drains. He had been experimenting with tiles from 1835, and had, on four acres of his drained clayey land, raised the largest crop of Indian corn ever produced in that county--eighty-three bushels of sh.e.l.led corn to the acre.

He states, that on this clayey soil, when laid down to gra.s.s, "not one square foot of the clover froze out." Again he says, "Heretofore, many acres of wheat were lost on the upland by freezing out, and none would grow on the lowlands. Now there is no loss from that cause."

The growing of Winter wheat has been entirely abandoned in some localities on account of freezing out, or Winter-killing; and one of the worst obstacles in the way of getting our lands into gra.s.s, and keeping them so, is this very difficulty of freezing out. The operation seems to be merely this: The soil is pulverized only to the depth of the plow, some six or eight inches. Below this is a stratum of clay, nearly impervious to water. The Autumn rains saturate the surface soil, which absorbs water like a sponge. The ground is suddenly frozen; the water contained in it crystallizes into ice; and the soil is thrown up into spicules, or honey-combs; and the poor clover roots, or wheat plants, are drawn from their beds, and, by a few repet.i.tions of the process, left dead on the field in Spring. Draining, followed by subsoiling, lets down the falling water at once through the soil, leaving the root bed of the plants so free from moisture, that the earth is not "heaved," as the term is, and the plants retain their natural position, and awaken refreshed in the Spring by their Winter's repose.

_There are no open ditches on under-drained land._ An open ditch in a tillage or mowing-field, is an abomination. It compels us, in plowing, to stop, perhaps midway in our field; to make short lands; to leave headlands inconvenient to cultivate; and so to waste our time and strength in turning the team, and treading up the ground, instead of profitably employing it in drawing a long and handsome furrow the whole length of the field, as we might do were there no ditch. Open ditches, as usually made, obstruct the movement of our teams as much as fences, and a farm cut into squares by ditches, is nearly as objectionable as a farm fenced off into half or quarter-acre fields.

In haying, we have the same inconvenience. We must turn the mowing-machine and horse-rake at the ditch, and finish by hand-labor, the work on its banks; we must construct bridges at frequent intervals, and then go out of our way to cross them with loads, cutting up the smooth fields with wheels and the feet of animals. Or, what is a familiar scene, when a shower is coming up, and the load is ready, Patrick concludes to drive straight to the barn, across the ditch, and gets his team mired, upsets his load, and perhaps breaks the leg of an animal, besides swearing more than half a mile of hard ditching will expiate. Such accidents are a great temptation to profanity, and under-draining might properly be reckoned a moral agent, to counteract such traps and pitfalls of the great adversary.

A moment's thought will satisfy any farmer who has the means, that true economy dictates a liberal expenditure of labor, at once, to obviate these difficulties, rather than be subject for a lifetime to the constant petty annoyances which have been named.

Open ditches, even when formed so skillfully that they may be conveniently crossed, or water-furrows which remain where land is laid into ridges by back-furrowing, as much of our flat land must be, if not under-drained, are serious obstructions, at the best.

They render the soil unequal in depth, taking it from one point where it is wanted, and heaping it upon another where it is not wanted, thus giving the crops an uneven growth. They render the soil also unequal in respect to moisture, because the back or top of the ridge must always be drier than the furrow.

Thorough-drained land may be laid perfectly flat, giving us, thus, the control of the whole field, to divide and cultivate according to convenience, and making it of uniform texture and temperature.

Attempts have been made, to estimate the saving in the number of horses and men by drainage, and it is thought to be a reasonable calculation to fix it at one in four, or twenty-five per cent. It probably will strike any farmer as a fair estimate, that, on land which needs drainage, it will require four horses and four men to perform the same amount of cultivation, that three men and three horses may perform on the same land well drained.

_Drained land will not require re-planting._ There is hardly a farmer in New England, who does not, each Spring, find himself compelled to re-plant some portion of his crop. He is obliged to hurry his seed into the ground, at the earliest day, because our season for planting is short at the best. If, after this, a long cold storm comes, on wet land, the seed rots in the ground, and he must plant again, often too late, incurring thus the loss of the seed, the labor of twice doing the same work, the interruption of his regular plan of business, and often the partial failure of his crop.

Upon thorough-drained land, this cost and labor could rarely be experienced, because nothing short of a small deluge could saturate well drained land, so as to cause the seed to fail, if sowed or planted with ordinary care and prudence, as to the season.

_Drained land is lighter to work._ It is often difficult to find a day in the year, when a wet piece of land is in suitable condition to plow.

Usually, such tracts are unequal, some parts being much wetter than others, because the water settles into the low places. In such fields, we now drive our team knee deep into soft mud, and find a stream of water following us in the furrow, and now we rise upon a knoll, baked hard, and sun-cracked; and one half the surface when finished is s.h.i.+ning with the plastered mud, ready to dry into the consistency of bricks, while the other is already in hard dry lumps, like paving stones, and about as easily pulverized.