EXPEKIMEXTS ON THE CULTURE OF TUEXIPS. 



261 



phosphates show an average per plot of 40*4 cwts. of dry matter 

 per acre, as against 37"0 cwt. grown by the soluble phosphates, 

 thus leaving a balance in favour of ground phosphates of 3"4 

 cwts. of dry matter per acre. The general average results 

 further show, that both soluble and insoluble phosphates give 

 each 9 '3 per cent, of dry matter in the total weight of crop 

 grown by each. The extra average of crop in favour of ground 

 phosphates is 37'o per acre, which at 9 '3 per cent, is exactly 

 represented by the 3*4 cwts. of dry matter. Thus, so far as 

 moisure is concerned, the produce of soluble and insoluble phos- 

 phate averages seem to be equal. 



Tor convenient comparison I shall tabulate the percentage of 

 dry matter, with its w^eight per acre, grown by the different 

 applications, stating the general average of each over all the 

 stations combined. 



These results seem to indicate that there is very little ditler- 

 ence in the percentage of dry matter from the produce of the 

 insoluble phosphate section with its three separate applications. 

 The single and triple plot are equal, and the double plot is only 

 one-tenth of a per cent, ahead. There is a little more variation 

 in the soluble section, the duuble ])lot again leading, soluble 

 phosphates alone l)eing 1 ])er cent, ahead of the insoluble; but 

 tlie trijde plot shows a rather lower percentage than the other 

 two, {dlhough hardly so large a dillerence as to call for the special 

 condemnation nitrogen receives from some experimenters as a 

 turnip fertiliser. 1 1 shows a sur])lus of solids over the double 

 plot of 5'2 cwts. per acre, which at 9 ])er cent, of solids is equal 

 to al)0ut 3 tons of tnrni]»s, whieli cannot be called dear at 

 6s. i')d. per ton., being total cost of nitrogen applied. On light 



