The Wohurn Field Experiments, 1911. 380 



and the second halves on May 16. By June 12 the wheat 

 was in ear, and then followed the prolonged drought previously 

 referred to. Plots 2a, 8a, and 8b, on which ammonia salts, 

 without lime, had been continually given, showed hardly any 

 crop, while plot 5a, similarly treated, was also djing off. On 

 the contrary, plot 2b, on which lime had last been applied in 

 December, 1897, was still showing well, as also did the small 

 application of lime given to plot 2aa. The farmyard manure 

 plot (lib) looked much better than the rape dust one (10b), 

 while a striking superiority was shown by plot 11a (on which 

 sulphate of potash had been used) over plot 10a (without 

 potash, but with superphosphate in its place). 



Quite as noticeable as in 1910 was the presence of coltsfoot 

 on the mineral manure plot (4), the growth of this weed l)eing, 

 as then, mainly confined to this particular plot. 



The wheat was cut on August 1, carted on August 9, and 

 threshed on November 15. The harvest results are given in 

 Table I., page 390. 



The results, as was to be expected in such a dry season as 

 that experienced, were decidedly low. The unmanured plots 

 gave, on an average, 8*2 bushels per acre, mineral manures alone 

 rather less than this, namely, 7*1 bushels. Sulphate of ammonia 

 used alone or with minerals, but without lime, gave either no 

 crop or only a bushel or two, but, when used with lime, 

 produced fair results. Thus, plot 2b, which last had 2 tons of 

 lime per acre in 1897, and had thus had fourteen successive 

 crops of wheat taken off it, still produced 12*6 bushels. Even 

 in the case of plot 2aa, where small doses of 5 cwt. per acre of 

 lime had been given in three separate years, as much as 19*1 

 bushels of wheat were obtained, this result being a better one 

 than that given by plot 2bb, on which a second dressing of 

 2 tons per acre of lime had been applied in 1905. On plot 51), 

 from which, since the application of 1 ton of lime per acre in 

 1905, seven crops had been taken, 15*1 bushels of wheat were 

 ol)tained. 



On the plots 8aa and 8bb, where only 10 cwt. per acre of 

 lime had been given in 1905, evidence was forthcoming as to 

 the lime having been, by now, practically worked out. In 

 regard to nitrate of soda, the striking feature was that, in a 

 dry year such as that experienced, the lighter dressing of nitrate 

 of soda (plot 3b) gave as good a return as the heavier one (3a), 

 except so far as the straw was concerned. Also it is remarkable 

 that the produce of these plots, where nitrate of soda was used 

 alone, was greater than that of plot 6 where superphosphate had 

 been used in conjunction with it. Indeed, the highest produce 

 for the year (21'8 bushels) was given by plot 3a, which received 

 nitrate of soda alone, the next highest yields being those of the 



