614 



JOUENAL OF THE llOYAL HORTICULTURAL SOCIETY. 



It would thus appear that, at least on our soil, the nitrogen in 

 hydrated calcium cyanamide is less readily available than that in cal- 

 cium cyanamide, and this is confirmed by the following results: — 



TABLE IV. 



Final Yield from Calcium Cyanamide, Hydrated Calcium Cyanamide, and 

 No Manure Plots. 





1909 



1910 





Roots 



Tops 



Roots 



Tops 



Calcium cyanamide 

 Hydrated calcium cyanamide . 



lb. 



261 



25 



25 



lb. 



i4 



lb. 



86 

 82| 



lb. 



954 

 834 

 77 



Here it is seen that during the period covered by the growth of the 

 crop the nitrogen in the hydrated calcium cyanamide had little effect, 

 but in some experiments in plots with these manures where several suc- 

 cessive crops were removed, the final result was that the last crops 

 from the soil manured with hydrated calcium cyanamide were far better 

 than those from plots manured with other chemical nitrogenous 

 fertilizers Containing equivalent quantities of nitrogen, thus indicating 

 that its effects are more lasting, and that the nitrogen contained becomes 

 slowly available. 



The results shown at Table V. also indicate, though not in a very 

 marked manner, that the nitrogen in calcium cyanamide itself is less 

 readily available than that in nitrate of soda. The seed was sown June 20, 

 1908, on unmanured land, and on August 17 a full dressing of calcium 

 cyanamide was given to one plot, a half-dressing of nitrate of soda to 

 the second, the third remaining unmanured. On November 2, when the 

 crop was weighed, the results were as foUowig : — ■ 



TABLE V. 



Yield from Late Dressings of Calcium Cyanamide, Nitrate of Soda, and 



No Manure. 



Manure applied 



"Weight of roots 



Weight of tops 



Total 





lb. 



lb. 



lb. 



Calcium cyanamide 



85 



48 



135 



Nitrate of soda (half dressing) 



92 



46 



138 





91 



38 



129 



The results indicate that if a nitrogenous manure is required to 

 exert its influence immediately, nitrate of soda or nitrate of lime are the 

 ones to use; if less active but more lasting manures are desired, 

 ammonium sulphate and calcium cyanamide are of about equal value, 

 nitrogen for nitrogen. 



Nitrate of Lime. — The commercial nitrate of lime is a pale 

 brownish compound, free from smell, and at first finely granular. It 

 contains about 75 per cent, to 77 per cent, of calcium nitrate, Oa(N03)2, 

 the residue being water with a very small amount of other substances. 

 It is not only very soluble in water, like other nitrates, but is also 



