4 6 



salts compared with nitrate of soda ; but, as already ex- 

 plained, these years do not furnish such a fair compariso n of 

 the action of the two manures. 



Other investigators have obtained similar results. Thus 

 Baessler* found, in experiments on a sandy humous soil, that 

 sulphate of ammonia applied to oats gave a yield of grain 

 about equal to that from nitrate of soda ; phosphates being 

 supplied in both cases. He found, however, that nitrate pro- 

 duced more straw. Rhodinf , on the average of two years, 

 found sulphate of ammonia distinctly better than nitrate of 

 soda in its results on oats grown on heavy clay. 



Amongst experiments carried out on oats grown in rota- 

 tion on ordinary farms, we may take as typical those con- 

 ducted by the Glasgow and West of Scotland Technical 

 College on a number of farms in the south-west of Scotland 

 in each of the years 1894 an< 3 1895. The following table 

 gives a summary of the average results per acre, as far as 

 they concern our present subject : 



TABLE XXIV. 



The results of these experiments are very consistent. 

 The increase obtained from all the manures was greater in 

 the wet season of 1894 tnan m tne dry one of 1895; but 

 the average produce of the different plots was in each year 

 in the same order. In every case the plots dressed with 

 sulphate of ammonia whether used alone, with super- 

 phosphate, or with superphosphate and muriate of potash 

 gave a larger yield of corn than the corresponding plots 

 receiving nitrate of soda. Also when used either alone or 

 with superphosphate and .muriate of potash, sulphate of 

 ammonia produced more straw than nitrate of soda; but 



Bied. Centr.," 1889. 



t " Exper. Stat. Kecord," 4. 



