In his excellent chapter on the sowing of turnips, he quotes several instances of the successful preparation of land in the autumn--breaking up, harrowing, cross-ploughing, drilling, and dunging--for the turnip crop, and he adds the following opinion:--
"Were such modes of culture adopted in the south of England, I have no doubt certain and abundant crops of turnips would be raised, in spite of droughts and insects; and the slovenly practice of broad-cast culture would then give way to the more scientific mode of the drill system."--(Vol. iii. p. 747.)
In the following passage he notices a curious but generally received fact regarding the effect of different quantities of bones; but we quote chiefly on account of another observation at its close, which may be interesting to our southern readers:--
"I have tried to raise turnips with different quantities of bone-dust, varying from twelve, sixteen, twenty, and twenty-four bushels to the imperial acre, and have found the crop improved up to sixteen bushels; but any quantity beyond that, even to twenty-four bushels, produced no greater effect on the turnips in the same field, and on the same sort of soil, than sixteen bushels. Nay, more than this, my late agricultural preceptor, Mr George Brown, when he farmed Hetton Steads in Northumberland, raised as good crops of turnips as sixteen bushels of bone-dust, with only eight bushels of bone-dust, combined with an indefinite quantity of sifted dry coal-ashes; and yet eight bushels of bone-dust, or an indefinite quantity of coal-ashes applied separately, produced a very poor crop of turnips. It is therefore unnecessary, in so far as the crop of turnips is concerned, to sow more than sixteen bushels of bone-dust alone, or eight bushels with coal-ashes, or perhaps street-manure. Both coal-ashes and street-manure, when proposed to be used with bone-dust, should be kept dry under cover, and sifted free of large lumps. * *
"The very best mode of using bone-dust in small quantity, both for increasing the fertility of the soil and rearing a good crop, is to sow the seed along with it in drills already manured with farm-yard dung. The bone-dust secures a good and quick braird of the plant, and the dung supports it powerfully afterwards. This plan I would recommend to be pursued, particularly in England, on the land prepared for turnips in autumn; and were it practised, we need not despair of raising heavy crops of turnips, especially Swedes, on the strongest soils, and most certainly they would be obtained after thorough-draining."--(Vol. iii. pp. 748, 751.)