392 
The Woburn Field Experiments y 1913. 
The nitrogenous top-dressings were next applied ; the first 
portions on April 19, and the second on May 20. 
The nitrate of soda plots did not this year present the bad 
appearances which were so marked in 1 912. The farmyard 
manure plot, as usual, looked the best in the earlier stages, but, 
later on, rape cake (plot 10b) showed a distinct advance, and 
this plot seemed better than lib. 
Drought throughout June much retarded the growing of 
the crop, and prevented it from ripening well. This was 
especially the case with the plots on which sulphate of ammonia 
had been used. 
The wheat crop was cut August 10 — 15, and was threshed 
direct out of the field on August 30, the corn being dressed 
and weighed on September 1. It was subsequently valued in 
October by Mr. J. Smith, junr., of Bedford. 
The results generally are rather better than those of 1912. 
Of the two unmanured plots 1 and 7, 7 affords the better guide, 
as the corn of plot 1 was damaged considerably by pigeons and 
mice when the shocks were standing in the field. The 
unmanured plot No. 7 gave 14*7 bushels per acre of corn, as 
against 8*2 bushels only in 1912. The straw amounted to 
10J cwt. per acre. 
Mineral manures (plot 4) gave, as usual, a rather lower 
return than the unmanured plot. Nitrate of soda, when used 
alone, produced a better crop than sulphate of ammonia, 
even where lime had been used with the latter. Doubling the 
dressing of' nitrate of soda produced 2 to 3 bushels of corn more 
than the single dressing, while the addition of mineral manures 
to nitrate of soda gave an increase of 4 to 5 bushels per acre. 
Sulphate of ammonia, used by itself, gave, as usual, no crop 
wfhere lime had not been applied ; and plots 2aa (1 ton of lime 
per acre, in four separate dressings of 5 cwt. each, with sulphate 
of ammonia) and 2bb (4 tons lime per acre, in two dressings of 
2 tons each, also with sulphate of ammonia) gave, both of them, less 
produce than the unmanured ones, but the sulphate of ammonia 
plot 2b (on which lime had last been given in 1897) was the 
best of these limed plots, and showed a distinct gain. The crops 
of plots 8aa and 8bb showed that the effect of 10 cwt. of lime 
per acre applied once, in 1905, was dying out, but on plot 5b, 
where 1 ton of lime per acre had been put on in 1905, 8*6 bushels 
more of corn were obtained than on the unmanured plot. 
There was nothing to show the superiority of potash over 
phosphoric acid, or vice versa, as a mineral dressing. 
The farmyard manure plot, though it did not look so well 
in the field as the rape cake plot, gave, ultimately, 3| bushels 
of corn per acre more. This plot also gave the highest yield of 
straw in the series, this being 26 cwt. per acre. 
