AND AG IICULTURE. 51 



the surface that the roots of the young grain 

 may be enabled to feed upon the decaying grass. 

 Clover, buckwheat, rape, rye, and sometimes 

 young turnips, are ploughed in green, as ma- 

 nure. 



Green crops should be ploughed into light and 

 sandy soils, and such as are poor in vegetable 

 matter. Sea-weed is also a very valuable ma- 

 nure, adding largely to the richness of the soil. 

 It not only supplies vegetable matter, but saline 

 substances. It is either spread over the land, 

 where it rots, or it is first made into a compost. 

 Marl and shell-sand, mixed with sea- weed, and 

 turned over twice or thrice before application, 

 makes a very excellent compost for light soils. 

 Potato and turnip tops, when the roots are dug, 

 make a good manure if ploughed in, especially if 

 grain is to be the next crop. By pulling off the 

 blossoms from the pot ,to-stalks, they may be 

 kept green until the potatoes are dug out, 

 and thus the yield of green manure is much 

 increased. 



Questions. Why should he sods "be left near the sur- 

 face? Name other green ci -ps which are ploughed in as 

 manures. For what kind of >mds are green crops the best 

 manure i Is sea-weed a good lanure ? How may the quan- 

 tity of potato-tops be increases for manure? 



