290 The Woburn Field Experiments, 1914. 



the heavier dressings, the second applications were made on 

 June 10. From this time riglit to the close, continuous 

 drought had a very serious effect upon the wheat crop, the 

 farmyard manure plot (lib) especially going back from its 

 previous good condition. 



The general result was that the crops ripened prematurely, 

 and l)y iVugust 15 they were all ready to cut. This was done, 

 and, the gr.dii being dry, the crop was threshed out direct 

 from the field without stacking. The corn was subsequently 

 dressed and weighed, and was valued in November by Mr. T. 

 Smith, junr., of Bedford. 



The results, as given in Table I., show that but a poor crop 

 was reaped. Indeed, one has to go back to 1904 to find so low 

 a general yield. The highest yield of all was now only 19'1 

 bushels (plot 5b) per acre, and the lowest yield was 2'5 

 bushels (plot 9b). 



Of the two unmanured plots 1 and 7, the latter is to be 

 taken by preference, as plot 1 was somewhat damaged by birds 

 and rats. This gives the unmanured produce as b\ bushels 

 per acre only. 



Mineral manures (plot 1), as usual, gave no increase ; 

 indeed, the yield was smaller, namely, 3*4 bushels. 



Sulphate of ammonia used by itself without minerals or 

 lime (plot 2a) gave no crop, and 7 "9 bushels where minerals 

 in addition were used, but without lime (plot 5a). With the 

 heavier dressing of sulphate of ammonia along with minerals 

 (plot 8a), the crop entirely failed, as usual. 



When lime was used in addition to sulphate of ammonia, 

 G"5 bushels were obtained on plot 2b, where 2 tons of lime 

 per acre only had been given, and this as long ago as Decem- 

 ber, 1897, the influence of the lime thus continuing to tell. 

 Plot 2aa, which had had 1 ton of lime altogether, but applied 

 in four separate dressings of 5 cwt. each at intervals, gave 9*8 

 bushels, whereas 2bb, which had had in January, 1905, an 

 additional 2 tons of lime per acre to the original one of 2 tons 

 in December, 1897, gave a lower yield than any of the other 

 limed plots, namely, 4-9 bushels. 



The addition in January, 1905, of 1 ton of lime to 

 sulphate of ammonia and mineral manures (plot 5b) produced 

 the highest yield of all the plots, namely, 19'1 bushels. On 

 plot 8aa, where only 10 cwt. of lime per acre had been given 

 in 1905, the yield was 9-6 bushels only, thus showing that 

 the lime is becoming exhausted. Omission of sulphate of 

 ammonia for a single year, as shown in the comparison 

 of plots 8aa and 8bb, produced a diminution of 5*6 

 bushels, and gave only "6 bushel more than minerals alone 

 (plot 4). 



