The Woburn Field Experiments , 1908. 339 
more essential than that of potash, but it is too early yet to come 
to a definite conclusion on this point. 
Coming lastly to the sulphate of ammonia plots,' it will be 
seen that while sulphate of ammonia when used alone (plot 2a) 
gave no crop, the small dressing of 5 cwt. of lime per acre 
yielded 3 bushels, and the 2 tons of lime per acre applied as far 
back as 1897 (plot 2b) gave as much as 22 - 9 bushels. The 
renewed application in 1905 (plot 2bb) did not yield so well, 
though earlier in the year the crop looked the better one. As 
regards sulphate of ammonia used with minerals, there was 
almost no crop (plots 8a and 8b) where no lime was used and 
a heavy dressing of sulphate of ammonia given, but the addition 
of lime, even at so low a rate as b ton per acre, gave a marked 
increase (plots 8aa and 8bb), 1 ton of lime (plot 5b) doing 
still better. It is becoming increasingly clear that heavy 
dressings of sulphate of ammonia when continuously applied 
will “run land out” where lime is deficient, even when 
mineral manures are applied, and that the true remedy is 
liming. There are, further, indications already that i ton per 
acre of lime is not sufficient, but that at least 1 ton per acre 
should be used. 
The full harvest results are given in Table I., page 340. 
The corn, after dressing, was valued, and the prices assigned 
to each plot are given in Table I. The highest grade comprised 
mainly the wheats grown with sulphate of ammonia, these being 
the strongest samples, though the yield, it must be remembered, 
was in several cases almost insignificant. Farmyard manure 
and rape dust alike gave very fair quality. The wheats 
generally were in good condition. 
Continuous Growing op Barley {Stackyard Field), 
1908 (32nd Season). 
The alterations in the plan of manuring mentioned in the 
case of the continuous wheat experiments just set out apply also 
to the barley crop. The land was ploughed in October, 1907, 
and again in February, 1908. Farmyard manure — to give 100 lb. 
ammonia per acre — was ploughed in on plot lib on February 
20. When removed from the feeding boxes on March 19, 
1907, this weighed 48 cwt. 3 qrs. 21 lb., and when put out on 
February 20, 1908, 30 cwt. 0 qr. 3 lb., the loss of weight 
being thus nearly 39 per cent. The actual quantity applied 
was 6 tons 9 cwt. per acre. On March 24 “ Chevalier ” barley 
was drilled at the rate of 9 pecks per acre. Mineral manures 
went in on April 9, as also rape dust (plot 10b). April was a 
wet and cold month, and the barley suffered a great deal, 
especially on the weaker plots. Indeed the crop never 
properly recovered from the check received at the start, and 
