1040 Synthetic Nitrogenous Fertilisers. [Feb., 



one and sometimes the other giving the better results. The 

 following are the results of some experiments: — 



Mangolds. 



Midland Agric. Coll., 1915. (1) 



Gloucester. (2) (3) 



Reading, 

 1909. (4) 



I Light soil. 



Heavy soil. 



1909. 



1910. 



Chalk soil. 



Strong loam. 



j t. cwt. 



Nitrate of soda . . I 20 8J 

 Nitrate of lime , 28 8 

 No nitrogenous) „„ in 

 top dressing.. } \ M 10 



/. cwt. 



30 14 

 30 4% 



25 18£ 



t. cwt. 



29 14 

 32 5 



23 14 



t. cwt, 



32 4 

 30 3 



28 



t. cwt. 



25 11 

 25 11 



21 19 



t. cwt. 



34 18 



35 1 



28 3 



1. — Harper Adams Agric. OolL Repts. 1909 and 191u, p. 33. 



2. - Glos. Repts. 1909 and 191c, p. 74. Table I. 



3. — Royal Agric. Coll. Repts. Cirencester 1910, p. 31. 



4. — Reading Univ. Coll. Dept. Agric. 1909. Bull. vii. p. 11. 



Potatoes. 



Barley. 



Wheat. 





Woburn , 

 19»9. 

 Sandy 

 loam. 

 (1) 



Devon. 

 Light 

 soil. 



(2) 



Jersey. 

 (5 centres) 



(8)' 



Abe'deen. 

 various 

 centres, 

 19<»7-9. 



(4) 



Ruthamsted, 

 l.&J. 



Grain. Straw. 



Rothamsted, 

 1910. 



Grain. Straw 



Nitrate of soda. . 

 Nitrate of lime.. 

 No nitrogenous ) 

 top dressing J 



t. cwt. 



15 9 

 15 6 



14 12 



t. cwt. 



10 15 

 10 7 



9 18 



lb. per 

 perch 



221 



228 



195 



/. cwt. 



9 5 

 9 6 



8 6 



bush. 



481 

 4b-2 



28-7 



lb. 



38*2 

 4449 



2619 



bush. 



27-0 

 20-7 



15-4 



lb. 



3760 

 3618 



1526 



1. — J. Roy. Agric. Soc. 1909, p. 385. 



2. — Devon C. C. Rept.. 1907-9, p. 6. 



3. — State of Jersey Field Expts. 1911, p. 2. 



4. — Aberdeen and N. Scotland Coll. Leaflet 9, p. 2. 



It is interesting to note that these results agree substantially 

 with those obtained in Germany and Austria. In order to avoid 

 the use of foreign measures the results are calculated to an 

 average value of 100 for nitrate of soda: — 





Rye. 



Wheat. 



Barley. 



Oats. 



Potatoes. 



Sugar 

 beet. 



Mangolds. 



Average 

 of all. 



Nitrate of soda 

 Nitrate of lime 



100 

 97 



105 



100 

 110 



100 

 109 



100 

 102 



100 

 97 



100 

 73 



100 

 99 



These results show that a farmer will be fairly safe in 

 regarding nitrate of soda and nitrate of lime as equally effec- 

 tive per unit of nitrogen, but he must be prepared to find 

 differences which are smoothed out in the above average results, 

 but which may operate on his farm. 



Unfortunately for buyers, nitrate of soda and nitrate of lime 

 do not contain equal amounts of nitrogen, so that a direct com- 

 parison of price is misleading; comparison can be made only by 

 calculating the price of 1 per cent, of nitrogen in each case. 

 As a rule nitrate of soda contains 15J per cent, of nitrogen 

 and nitrate of lime 13 per cent. 



v 



