170 FOOD FOR PLANTS 



21. The equivalent quantities of Nitrate, ammo- 

 nium sulphate, and dried blood were utilized in the 

 order named. 



22. The animal manures when used together with 

 the larger applications of Nitrate, were utilized to 

 better advantage than when they were used together 

 with the smaller application. 



23. The Nitrate and ammonium sulphate when 

 used together with solid manure, leached, were 

 utilized in the order named. 



24. The proportion of nitrogen recovered in the 

 crops ranged from 62.09 — 22.31 per cent. 



25. With the returns from the Nitrate nitrogen 

 taken as 100, the relative availability of the other 

 nitrogenous materials was as follows: 



First Second Both 



Rotation Rotation Rotations 



Sodium Nitrate 100.0 100.0 100.0 



Ammonium sulphate 78.9 60.3 69.7 



Dried blood 76.3 52.2 64.4 



Solid manure, fresh 32.9 39.0 35.9 



Solid and liquid, fresh 50.4 55.6 53.0 



Solid manure, leached 33.8 44.0 38.9 



Solid and liquid, leached . . . 36.6 49.7 43.1 



26. Nitrate, and ammonium sulphate showed prac- 

 tically no residual effect. Dried blood showed a 

 slight residual effect. 



27. The animal manures showed a very pronounced 

 residual effect. 



28. Notwithstanding the annually repeated appli- 

 cations of manure, together with relatively large 

 amounts of Nitrate, there is no marked evidence of 

 denitrification. 



29. All of the cylinder soils lost considerable quan- 

 tities of nitrogen. 



