CLASSIFICATION OF 11AM i:h 1 '1 9 



is too great to vi»-l<l l profit from their sale. The chief 

 use of marls is to supply lima to soils. 



2. Gypsum, which when ground up is known as land- 

 plaster, is a compound of calcium. oxygen and sulphur. 

 It is a soft, white rubttailce easily ground op to a 

 powder. Gypsum is used to supply lime to soiU. 



'. Wood ashes were formerly much used as a fertili- 

 zer, hut now as wood has hecomc more valuable less 

 ashes arc produced than formerly. Wood ashes lie 

 exceedingly valuable for manure, as they contain all 



the mineral elements necessary for plant food. W 1 



ashes all contain a notably large proportion of potash. 

 I. Swamp muck is the rich, dark mud that aceumu- 

 latet in the bottom of ponds and swamps. It u rich 

 in organic matter, and is sometimes applied to 

 poor in humus. 



5. Wood's mold ii formed by decaying leaves and 

 branches from for* . and is used for enriching 



gardens and hotbeds.. 



• Dead leaves, straw and inch waste prodooti amy 

 all be used to supply organic matter to loils, 



f. Barnyard manure is often classed with stable 

 manure, though really quite I different product. It is 

 the manure that accumulates in small lots where cattle 

 are kept and fed. and consists of the droppings of the 

 cattle mixed with the bedding supplied them. The 

 value of such manure depend! both on the bedding 

 and the drainage of the lot, When the bedding is thin, 

 and the lot well drained, rain water washes away many 

 valuable prodncti from the manure. If. on the other 

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