5 1 



probably superior to sulphate of ammonia, both in yield 

 per acre and in feeding value. 



From i to 2 cwt. per acre applied at seed time is a good 

 dressing in practice, with farmyard manure, 3 or 4 cwt. of 

 superphosphate, and 2 cwt. of kainite. These quantities are, 

 of course, variable according to soil and other conditions. 



TURNIPS AND SWEDES. 



Following the order adopted in considering other crops, 

 the experiments at Rothamsted on the continuous growth 

 of swedes, from 1856 to 1871, may first be examined. The 

 manuring of the plots was not absolutely the same all 

 through the experiment ; nitric acid and sawdust being 

 used in place of nitrate of soda for the first five years. For 

 the sake of brevity, however, we will speak of these plots 

 as receiving nitrate of soda. 



The following table shows the weight of roots per acre 

 per annum produced by various manures : 



TABLE XXIX. 



The results are somewhat similar to those already noticed 

 in the case of mangels. With farmyard manure, ammonia 

 salts were undoubtedly more effective than nitrate of soda ; 

 while without farmyard manure, nitrate was in every in- 

 stance superior to ammonia salts in the weight of roots it 

 produced. The effect of potash, when used with super- 

 phosphate and a nitrogenous manure, was just what we. 

 have seen so often with regard to other crops tending,, 

 if anything, to diminish the yield when nitrate was used,, 

 but increasing it with ammonia salts. 



Passing on to experiments on turnips grown under ordi- 

 nary farm conditions, an important series, carried out in, 

 Banffshire, ::: under the direction of the Highland and Agri- 

 cultural Society, in 1893-4, ma y be taken as an example. 

 The following are the results, so far as they concern the 

 present subject, obtained on the various plots for each of 

 the years of experiment. The results of 1893 are the 



* " Transactions of the Highland and Agricultural Society," Vols. VI. 

 and VII., Fifth Ssries. 



D 2 > 



