168 FOOD FOR PLANTS 



much superior to those in solid manure as a source 

 of nitrogen to crops. 



3. Larger applications of nitrogen were invariably 

 followed by larger yields of this constituent in the 

 crops. 



4. Nitrate, ammonium sulphate and dried blood, 

 when applied in equivalent amounts, were found to 

 possess an unequal value. Nitrate was superior to 

 ammonium sulphate, and the latter was superior to 

 dried blood as a source of nitrogen to crops. 



5. In the presence of Nitrate, the manure and 

 humus nitrogen were utilized more thoroughly than 

 in its absence. 



6. Under certain conditions. Nitrate or other 

 readily available nitrogen compounds, may hasten 

 the depletion of the soil nitrogen. 



7. Ammonium sulphate and dried blood intensified 

 the development of acidity in the cylinder soils. 



8. The proportion of nitrogen in the crops was 

 readily affected by the nitrogen treatment. It was 

 also affected by the character of the crop itself. 



9. In the first rotation, the fresh manures produced 

 dry matter relatively somewhat richer in nitrogen 

 than that produced by the leached manures; in the 

 second rotation this relation was reversed. 



10. The solid and liquid manure, fresh, produced 

 dry matter relatively somewhat richer in nitrogen 

 than that produced by the solid, fresh. 



11. The smaller application of Nitrate when used 

 together with manure, produced dry matter rela- 

 tively poorer in nitrogen than that produced by the 

 larger application of Nitrate under the same 

 conditions. 



