136 Experiments with Calcium Cyanamide. [may, 



largest increase was given by Plot 6, nitrate of lime, and 

 .amounted to 556 lb. of grain and cwt. straw as compared 

 with Plot 2. This was a very profitable increase indeed. 



The average results were as follows, those for 1907 being 

 given separately owing to the unfavourable character of the 



season, which affected the accuracy of the results. 







Average of Experiments 





1907. 







1905, 1906. and 1908. 



Average 0 



f 7 Experiments. 







10 Oats and 3 Barley. 



6 Oats 



and 1 Barley. 



Plot. 



Manure. 

















Straw and 



Grain. 



Straw and 







Grain. 



Chaff. 



Chaff. 







lb. 



cwt. 



lb. 





cwt. 





No manure 



2196 



27! 



1957 





36! 



2 



Superphosphate, 2 cwt. 



2260 









431 





and Potash, i-i^ cwt. 

 D •. and Nitrate of 



29 



2250 





3 



Soda ... 

 Do. and Sulphate of 



2595 



35i 



2308 





52| 



4 



Ammonia ... 



2668 



37 



2415 





56 



5 



Do. and Calcium Cy- 













anamide 



2680 



35 



2225 





49± 





Do. and Nitrate of 











6 



Lime 



2816 



38S J 



2315 





5o| 



7 



Do. and Calcium Cy- 













anamide 



2697 



35i 



2234 





53i 



The results from cyanamide are practically identical in 

 grain with those from sulphate of ammonia, but sulphate 

 of ammonia has a slight advantage in straw, while they are 

 slightly superior in grain to those from nitrate of soda and 

 practically identical in straw. In both cases, however, the 

 difference is too small to justify any conclusions being drawn 

 from it. 



Nitrate of lime was used in only two seasons out of the 

 three, but in both of these it gave results distinctly superior 

 in grain to those of any of the other plots manured with 

 nitrogen. In this case the results were very consistent 

 throughout the experiments. In straw also the nitrate of 

 lime had an advantage over any of the other manures. The 

 superiority of nitrate of lime over nitrate of soda was distinctly 

 shown throughout all the experiments, and was quite unex- 

 pected. Nitrate of soda is generally regarded as the most 

 active of all the nitrogenous manures in ordinary use. Innu- 

 merable experiments in this and other countries have shown 

 that on the average it wall give for equal weights of nitrogen 



