Vegetable refuse of all kinds, when smother-burned in a similar way, becomes a valuable mechanical improver of the soil; but the preferable course is to decompose it in a heap with quicklime and layers of earth, converting it into leaf-mould.
In the first edition of the Improver Improved no mention is made of clover, nor in the second of turnips, but in the third, clover is treated of at some length, and turnips are recommended as an excellent cattle crop, the culture of which should be extended from the kitchen garden to the field.
Enclosures must have been numerous in some counties; and there is a very good comparison between " champion (open fields) country and several," which Blith afterwards transcribed into his Improver Improved.
A great many works on agriculture appeared during the time of the Commonwealth, of which Walter Blith's Improver Improved and Samuel Hartlib's Legacie are the most valuable.
At the end of the contract the landlord either cultivates his land himself or leases it, repaying to the improver part of the expenditure incurred by him.