TABLE OF CONTENTS. 



BULLETIN "E." 



INFLUENCE OF FARM YARD MANURE UPON YIELD AND UPON THE WATER- 

 SOLUBLE SALTS OF SOILS. 



PAGE 



Conditions under which the observations were made 1 



Application of the manure 3 



Seed, planting and care of crop .* 3 



Relation of yields to fertilizations 4 



Yields of corn 4 



Increase of yield due to fertilization 6 



Yields of potatoes ; 14 



Increase in yield due to fertilization 17 



Mean increase in yields on 8 soil types due to fertilization 18 



Influence of farm yard manure on the water-soluble salts of soils. 20 

 Effect of 5, 10 and 15 tons of manure per acre upon the water- 

 soluble salts of soils . , 20 



Influence of 25, 50, 100 and 200 tons of manure per acre upon 



the water-soluble salts of soils 23 



Potash absorbed from manure by eight soils 25 



Influence of manure on the water-soluble lime in 8 soils ... 26 



Influence of manure on the water-soluble magnesia in 8 soils. 27 

 Influence of 5, 10, and 15 tons of stable manure on the 



amounts of nitric acid in field soils 28 



Influence of large amounts of manure upon the nitric acid in 



soils 31 



Influence of manure upon the water-soluble phosphates in 



soils 32 



Influence of farm yard manure upon the amounts of water- 

 soluble sulphates in soils 34 



Influence of manure upon the amounts of water-soluble bi- 



carbonates, chlorine and silica in soils 35 



Amounts of salts recovered from manured soils by continuous 



percolation 36 



Amounts of water-soluble salts added to the 8 soil types with 



the different quantities of manure applied 39 



Amounts of salts added to the soils with the manure which 



were not recovered by washing in distilled water 41 



Influence of lime and stable manure on water-soluble salts in 



soils . 44 



