FAEM MANURE 



Ooo 



The long tests conducted by the Pennsylvania and Ohio ex- 

 periment stations ^ have established this fact. The following 

 data from Illinois ^ may be cited, comparing the response of 

 maize and oats when manured to the increased yield of clover 

 receiving the same treatment. (See Table CXXII, page 534.) 



CROP 



FOOD L0S5ES 



ANIMAL- 



MANURE ■ 



M AHURIAL LOS SES 

 OM -50%" 

 NHs - 60 >» 

 Pz O5 -40 '» 

 K2O -65 » 



y^W 



'^^^^^^^^^^^mM^^^mmm^j^0' 



PERCENTAGE OF THE COWS« 

 TITUENTS OP CROP 

 ADI3ED TO SOIL 



WATER 



30 1L NUTRIEMT 3 

 CaO ,30? 



\ 



LEACHING 



Fig. 63. — ^Diagram showing the proportion of the harvested crop added to 

 the soil in farm manure under average conditions. 



It is easy to see that a liberal dressing of manure on the 

 hay and pasture will markedly increase the crop. Neverthe- 

 less, as manure is available in limited amounts on the average 

 farm and as commercial fertilizers will give almost as good 

 returns on hay, it is generally considered judicious, except in 



*Hunt, T, F., General Fertiliser Experiments; Ann. Eep. Penn. Agr. 

 Exp. Sta., 1907-1908, pp. 68-93. 



Thorne, 0. E., and others, JPlans and Summary Tables of the Experi- 

 ments at the Central Farm; Ohio Agr. Exp. Sta., Cire. 120, pp. 101- 

 105, 1912. 



3 Hopkins, C. G., Thirty Years of Crop dotation m Illinois; 111. Agr. 

 Exp. Sta., Bui. 125, p. 337, 1908. 



