- 219 - 



It will be seen that the experimental plots were not numerous 

 enough to enable one to determine in a single season the magni- 

 tude of the difference, if any, between the four nitrogenous ferti- 

 lisers selected for comparative trial. 



One sees, however, that if any difference does exist between 

 the effectiveness, nitrogen for nitrogen, of nitrate of soda and ni- 

 trate of lime, or of sulphate of ammonia and cyanamide, it will 

 be only a difference of 10 per cent, or less. That being the case, 

 it should be the character of the soil and the relative price of the 

 fertilisers per unit of nitrogen, which should dictate the choice 

 between them. The Rothamsted soil has no special peculiarity 

 and suits any of these fertilisers indifferently, but on other soils 

 very light sands, heavy clays, soils very short of lime secondary 

 considerations, which do not come into play in these experiments, 

 will make one or other of these fertilisers the preferable manure". 



R. A. BERRY. Reports on experiments with some new nitro- 

 genous manures on oats, hay, potatoes etc. (West of 



Scot. Agr. Coll. Ann. Rpt., 9, 1909, pp. 15-31). E. S. JR., March 

 1910. Washington. 



These experiments are a comparison of the value of lime ni- 

 trate, basic lime nitrate, and lime nitrogen with nitrate of soda and 

 sulphate of ammonia as sources of nitrogen. 



Oats. Eight plats showed no advantage of lime nitrogen over 

 nitrate of soda. Other plats showed very little difference between 

 nitrate of soda and the same amount of nitrogen in lime nitrate. 

 While basic lime nitrate and lime nitrogen gave lower results. 



Hay. Nitrate of soda and the same amount of nitrogen in 

 sulphate of ammonia gave about 2 tons 480 Ibs. per acre. While 

 lime nitrogen gave only i ton 1994 Ibs. of hay. 



125 Ibs. of nitrate of soda gave 1180 Ibs. per acre more than 

 the check plat, while the same amount of nitrogen in basic nitrate 

 of lime and nitrate of lime gave 605 and 400 Ibs. respectively. 



Mangels. The same amount of nitrogen applied in the form 

 of nitrate of soda gave heavier crops than in the form of lime 

 nitrate. 



Potatoes. There was a difference in favour of sulphate of am- 

 monia as against lime nitrate. 



