52 



average of 25 experiments where artificials only were used, 

 and of 15 where farmyard manure was also employed. 

 Those of 1894 are t* 16 averages of 22 and 16 experiments 

 respectively. 



TABLE XXX. 



In 1893, w i tn eac h kind of additional manure, sulphate 

 of ammonia gave distinctly better results than nitrate of 

 soda ; and in 1894, sulphate was also more efficient when 

 -used with artificials only. With farmyard manure, how- 

 ever, contrary to what we should expect, nitrate gave a 

 better return, so that on the average of the two years it 

 yielded half a ton more roots with superphosphate and 

 farmyard manure, though with bonemeal and farmyard 

 manure it was still 7 cwt. inferior to sulphate of ammonia. 

 This is another example of the comparatively better effect 

 of superphosphate and nitrate than of superphosphate and 

 sulphate. It is unfortunate that this series of experiments 

 <iid not include plots dressed with potash ; for it would 

 have been interesting to see whether, as with other crops, 

 the addition of potash to the other manures would have 

 increased the yield where sulphate was used to a greater 

 extent than with nitrate. 



The effect of season has much to do with the question of 

 the relative economy of sulphate of ammonia and nitrate of 

 goda on the turnip crop. Thus, in a similar experiment to 

 the above, carried out in the year 1892" not included with 

 the results of 1893-4 because the manurings tested were 

 not exactly similar sulphate of ammonia with bone meal 

 gave 10 cwt. more roots than nitrate; but with super- 

 phosphate, nitrate produced 9 cwt. more than sulphate, a 

 result less favourable to sulphate of ammonia than those 

 of 1893-4. 



* " Transactions of the Highland and Agricultural Society," Vol. V., 

 Fifth Series. 



