Many farmers, because their fathers did so before them, plow their corn lands very shallow before planting; but make up for it in deep plowing while dressing the corn crop. Why is corn plowed at all?
1. TO DESTROY WEEDS.—In this climate if a plow is not kept lively in the early part of the season, weeds will completely take the crop. The soil is like a table full of food. Every man who sits down to it makes it less. Every weed eats up a part of the soil, and takes away, needlessly, so much from the corn. But it is not merely the nutritive ingredients which are extracted—but what, on some soils, in some seasons, is even worse—weeds drink up the moisture. There are many soils which could afford to lose much mineral and vegetable substance without lessening the supply for corn; but, in this climate, in ordinary seasons, no soil can afford to squander its moisture.
But a corn crop is often put in to act as a cleanser of the soil when it has become foul. This end can only be answered by a rigid persecution and destruction of the weeds throughout the whole growing season. Some farmers, strangely enough, will deal thoroughly with their fields, but allow the edges and fence rows to swarm with weeds that luxuriate and ripen seed which the winds scatter all over the field. This is as if a man should busy himself all day long, in driving hogs out of his field, but leave all the holes open where they broke in. The soil should be thoroughly worked.
2. TO PREVENT DRYNESS.—Nothing is wider of the truth, than letting corn alone in dry weather for fear of “firing” it. If the plow begins early, and is kept going, no drought likely to occur in our climate can do much injury; especially if the ground has been broken up deep before planting.
Where the atmosphere is very dry, very hot and windy, the evaporation of moisture from the plant, and from the surface of the soil, is excessive. A hill of corn will exhale many pounds of moisture in a day. There is no remedy for excessive exhalation from plants; but this renders it yet more necessary that a supply should be kept up at the roots. If the soil therefore, is permitted to evaporate from its surface, the double draught upon its moisture—through the plant, and from the surface—will soon exhaust its water.