text:  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