EXPEKDIENTS ON TURNIPS. 



311 



by the results of the unclunged plots, for in the other plots 

 the dung may supply all that is required of one or more 

 constituents. The results from the dunged and undunged 

 plots are therefore kept separate. The application of 5 tons 

 lime to the stubble in the previous winter rendered the 

 precautionary addition of lime and magnesia to the manure 

 unnecessary. 



(A) Nitrogen. — Table VII. shows how far the land experi- 

 mented on requires nitrogen to grow turnips. In this table all 

 the plots put against each other for comparison have the same 

 manures except that in the one case they received nitrate of 

 soda and in the other none. Thus plot 10 received superphos- 

 phate and potash salts, while plot 11, compared with it, received 

 exactly the same manure, with the addition of 1-^ cwt. nitrate of 

 soda per acre. It will be seen from an examination of Tables 

 II. and V. that this is also true for each pair of plots compared 

 both in 1882 and 1883. As it is evident that nitrogen without 

 the addition of phosphates in some form cannot have its full 

 effect upon turnips, the trial 27 against the mean of 14 and 15 

 might be omitted in the table, and in this case the average 

 increase by using nitrate of soda would be increased, especially 

 in 1882. The increase in both years is approximately 20 per 

 cent., and showsj that both fields are benefited bv nitim^en ; 

 but while its use for turnips might pay in a large crop like that 

 of 1883, the increased growth taking advantage of a supply of 



Table VIII. 

 Nitrogen v:ith Dung. 



