104 



CONSERVATION AND IMPROVEMENT OF SOIL 



nearly $30.00 a year. This value, however, does not include the 

 humus produced, but merely the three chemical plant foods 

 mentioned. 



100 I ZO 140 160 180 200 220 



COTTON-SEED MEAL 

 UNSEED MEAL 

 BUCKWHEAT MIDDLINGS 

 DRIED DISTILLERS' GRAINS 



MALT SPROUTS 

 GLUTEN FEED 

 DRIED BREWERS' GRAINS; 

 WHEAT BRAN 

 CLOVER HAY 



WHEAT 



OATS 



INDIAN CORN 



BARLEY 



TIMOTHY HAY 



WHEAT STRAW 



MILK 



POTATOES 



CREAM 



MANGELS 



BUTTER 



NITR06EN PHOSPHORIC ACIO POTASH tIANURIALVA AJE POT TON 



FIG. 76. Comparative manurial values of feeding stuffs. The actual prices given are 

 based on the commercial prices of fertilizers: nitrogen 15 cents, phosphoric acid 4 cents, 

 and potash 4 cents per pound. (Productive Feeding.) 



If equal weights of manure from the different kinds of farm 

 animals are considered, the relative values would be arranged 

 from poorest to best in this order: cattle, horses, swine, sheep 



