C. Crowther and a. G. Ruston 



199 



Effects upon Yield of Hay. 



It is not proposed to discuss here the detailed records of the hay 

 crops obtained on the different plots. The summary given in Table II 

 will perhaps suffice to indicate the general character of the effects 

 produced by the manuring. 



Table II. Yield of Hay {per acre). 16 Years (1899-1914). 



* Average yield on unmanured plots = 26-8 cwts. i 1-0. 



The main features of the average yields may be summarised as 

 follows : 



(1) With one exception (Plot 12 — sulphate of ammonia alone) 

 the manured plots all show substantial increases over the unmanured 

 plots. 



(2) The plots which have received dung (Plots 2-6) — not excepting 

 even Plot 3, which in alternate years was entirely unmanured — show 

 much more substantial increases than those which have received only 

 "artificial" manures (Plots 7-12). 



(3) Nitrate of soda has proved markedly superior to sulphate of 

 ammonia {cf. Plots 7 and 8; 9 and 10; 11 and 12). 



(4) The use of sulphate of ammonia alone (Plot 12) has proved 

 very unsatisfactory. 



(5) Within the limits of error of experiment alternate annual 

 dressings of dung and nitrate of soda (Plot 4) have given as high yields 

 as any other treatment {cf. with Plots 2, .5, 6). 



Journ. of Agrio. Sci. vn 14 



