Part 3

The Wheat and Turnep Drill-Boxes, or the Drill-Plough complete, mentioned in this Treatise, may be had at Mr. Mulford’s in Cursitor-street, Chancery-lane, London.

CHAP. I.

Of ROOTS and LEAVES.

Since the most immediate Use of Agriculture, in feeding Plants, relates to their Roots, they ought to be treated of in the first Place.

Roots are very different in different Plants: But ’tis not necessary here to take notice of all the nice Distinctions of them; therefore I shall only divide them in general into two Sorts, viz. Horizontal-Roots, and Tap-Roots, which may include them all.

All have Branchings and Fibres going all manner of ways, ready to fill the Earth that is open.

But such Roots as I call Horizontal (except of Trees) have seldom any of their Branchings deeper than the Surface or Staple of the Earth, that is commonly mov’d by the Plough or Spade.

The Tap-Root commonly runs down Single and Perpendicular reaching sometimes many Fathoms below.

In this manner descends the first Root of every Seed; but of Corn very little, if at all, deeper than the Earth is tilled.

These first Seed-Roots of Corn die as soon as the other Roots come out near the Surface, above the Grain: and therefore this first is not called a Tap Root; but yet some of the next Roots that come out near the Surface of the Ground, always reach down to the Bottom of the pulveriz’d Staple; as may be seen, if you carefully examine it in the Spring time; but this first Root in Saint-foin becomes a Tap Root.

This (tho’ it goes never so deep) has horizontal ones passing out all round the Sides; and extend to several Yards Distance from it, after they are by their Minuteness, and earthly Tincture, become invisible to the naked Eye.

A Method how to find the Distance to which Roots extend Horizontally.

Pl. 6. Fig. 7. Is a Piece or Plot dug and made fine in whole hard Ground, the End A 2 Feet, the End B 12 Feet, the Length of the Piece 20 Yards; the Figures in the middle of it are 20 Turneps, sown early, and well ho’d.

The manner of this Hoing must be at first near the Plants, with a Spade, and each time afterwards, a Foot farther Distance, till all the Earth be once well dug; and if Weeds appear where it has been so dug, hoe them out shallow with the Hand-Hoe. But dig all the Piece next the out Lines deep every time, that it may be the finer for the Roots to enter, when they are permitted to come thither.

If these Turneps are all gradually bigger, as they stand nearer to the End B, ’tis a Proof they all extend to the Outside of the Piece; and the Turnep 20 will appear to draw Nourishment from six Feet Distance from its Centre.

But if the Turneps 16, 17, 18, 19, 20, acquire no greater Bulk than the Turnep 15, it will be clear, that their Roots extend no farther than those of the Turnep 15 does; which is but about 4 Feet.

By this Method the Distance of the Extent of Roots of any Plant may be discover’d.

What put me upon this Method was an Observation of two Lands (or Ridges) drill’d with Turneps in Rows, a Foot asunder, and very even in them; the Ground, at both Ends, and one Side, was hard and unplow’d; the Turneps not being ho’d, were very poor, small, and yellow, except the Three outside Rows, B, C, D, which stood next to the Land (or Ridge) E, which Land being plow’d and harrow’d, at the time the Land A ought to have been ho’d, gave a dark flourishing Colour to these three Rows; and the Turneps in the Row D, which stood farthest off from the new-plow’d Land E, received so much Benefit from it, as to grow twice as big as any of the more distant Rows. The Row C, being a Foot nearer to the new-plow’d Land, became twice as large as those in D; but the Row B, which was next to the Land E, grew much larger yet.

A like Observation to this on the Land E, has been made in several Turnep Fields of divers Farmers, where Lands adjoining to the Turneps have been well tilled; all the Turneps of the contiguous Lands that were within three or four Feet, or more, of the newly pulveriz’d Earth, received as great, or greater increase, in the Manner as my Rows B C D did; and what is yet a greater Proof of the Length of Roots, and of the Benefit of deep Hoing, all these Turneps have been well Hand-ho’d; which is a good Reason why the Benefit of the deep Pulveration should be perceivable at a greater Distance from it than mine, because my Turneps, not being hoed at all, had not Strength to send out their Roots through so many Feet of unpulveriz’d Earth, as these can through their Earth pulveriz’d by the Hoe, tho’ but shallowly.

This Observation, as ’tis related to me (I being unable to go far enough to see it myself) sufficiently demonstrates the mighty Difference there is between Hand-hoing and Horse-hoing.

F Plate 6. is a Piece of hard whole Ground, of about two Perch in Length, and about two or three Feet broad, lying betwixt those two Lands, which had not been plow’d that Year; ’twas remarkable, that during the Length of this interjacent hard Ground, the Rows B, C, D, were as small and yellow as any in the Land.

The Turneps in the Row D, about three Feet distant from the Land E, receiving a double Increase, proves they had as much Nourishment from the Land E, as from the Land A, wherein they stood; which Nourishment was brought by less than half the Number of Roots of each of these Turneps.

In their own Land they must have extended a Yard all round, else they could not have reach’d the Land E, wherein ’tis probable these few Roots went more than another Yard, to give each Turnep as much Increase as all the Roots had done in their own Land.

Except that it will hereafter appear, that the new Nourishment taken at the Extremities of the Roots in the Land E, might enable the Plants to send out more new Roots in their own Land, and receive something more from thence.

The Row C being twice as big as the Row D, must be suppos’d to extend twice as far; and the Row B, four times as far, in proportion as it was of a Bulk quadruple to the Row D.

A Turnep has a Tap-Root, from whence all these Horizontal Roots are deriv’d.

And ’tis observable; that betwixt these two Lands there was a Trench, or Furrow, of about the Depth of nine or ten Inches, where these Roots must descend first, and then ascend into the Land E: But it must be noted, that some small Quantity of Earth was, by the Harrowing, fall’n into this Furrow, else the Roots could not have pass’d thro’ it.

Roots will follow the open Mould, by descending perpendicularly, and mounting again in the same manner: As I have observ’d the Roots of a Hedge to do, that have pass’d a steep Ditch two Feet deep, and reach’d the Mould on the other side, and there fill it; and digging Five Feet distant from the Ditch, found the Roots large, tho’ this Mould was very shallow, and no Roots below the good Mould.