Success with Small Fruits

by Edward Payson Roe

CHAPTER VIII.

PREPARATION OF SOIL BY DRAINAGE

Excessive moisture will often prevent the immediate cultivation of our ideal strawberry land. Its absence is fatal, its excess equally so. Let me suggest some of the evil effects. Every one is aware that climate—that is the average temperature of the atmosphere throughout the year—has a most important influence on vegetation. But a great many, I imagine, do not realize that there is an underground climate also, and that it is scarcely less important that this should be adapted to the roots than that the air should be tempered to the foliage. Water-logged land is cold. The sun can bake, but not warm it to any extent. Careful English experiments have proved that well-drained land is from 10 to 20 degrees warmer than wet soils; and Mr. Parkes has shown, in his "Essay on the Philosophy of Drainage," that in "draining the 'Red Moss' the thermometer in the drained land rose in June to 66 degrees at seven inches below the surface, while in the neighboring water-logged land it would never rise above 47 degrees—an enormous gain."

In his prize essay on drainage, Dr. Madden confirms the above, and explains further, as follows: "An excess of water injures the soil by diminishing its temperature in summer and increasing it in winter—a transformation of nature most hurtful to perennials, because the vigor of a plant in spring depends greatly on the lowness of temperature to which it has been subjected during the winter (within certain limits, of course), as the difference of temperature between winter and spring is the exciting cause of the ascent of the sap." In other words, too much water in the soil may cause no marked difference between the underground climate of winter and spring.

Dr. Madden shows, moreover, that excess of water keeps out the air essential not only in promoting chemical changes in the soil itself and required by the plants, but also the air which is directly needed by the roots. Sir H. Davy and others have proved that oxygen and carbonic acid are absorbed by the roots as well as by the foliage, and these gases can be brought to them by the air only.

Again, drainage alters the currents which occur in wet soil. In undrained land, evaporation is constantly bringing up to the roots the sour, exhausted water of the subsoil, which is an injury rather than a benefit. On the other hand, the rain just fallen passes freely through a drained soil, carrying directly to the roots fresh air and stimulating gases.

Wet land also produces conditions which disable the foliage of plants from absorbing carbonic acid, thus greatly decreasing its atmospheric supply of food. Other reasons might be given, but the reader who is not satisfied had better set out an acre of strawberries on water-logged land. His empty pocket will out-argue all the books.

The construction of drains may be essential, for three causes: 1st. Land that is dry enough naturally may lie so as to collect and hold surface water, which, accumulating with every rain and snow storm, at last renders the soil sour and unproductive. 2nd. Comparatively level land, and even steep hillsides, may be so full of springs as to render drains at short intervals necessary. 3rd. Streams, flowing perhaps from distant sources, may find their natural channel across our grounds. If these channels are obstructed or inadequate, we find our land falling into the ways of an old soaker.

It should here be stated, however, that if we could cause streams to overflow our land in a shallow, sluggish current, so that a sediment would be left on the surface after a speedy subsidence, the result would be in miniature like the overflow of the Nile in Egypt, most beneficial, that is, if means for thorough subsequent drainage was provided.

If there is an abundance of stone on one's place suitable for the construction of drains, it can often be used to advantage, as I shall show; but for all ordinary purposes of drainage, round tile with collars are now recommended by the best authorities. It is said that they are cheaper than stone, even where the latter is right at hand; and the claim is reasonable, since, instead of the wide ditch required by stone, a narrow cut will suffice for tile; thus a great saving is at once effected in the cost of digging. Tile also can be laid rapidly, and are not liable to become obstructed if properly protected at points of discharge by gratings, so that vermin cannot enter. They should not be laid near willow, elm, and other trees of like character, or else the fibrous roots will penetrate and fill the channel. If one has a large problem of drainage to solve, he should carefully read a work like Geo. E. Waring's "Drainage for Profit and for Health;" and if the slope or fall of some fields is very slight, say scarcely one foot in a hundred, the services of an engineer should be employed and accurate grades obtained. By a well-planned system, the cost of draining a place can be greatly reduced, and the water made very useful.