Agricultural Chemistry — Turnips, 



525 



time, under the influence of one and the same season, when a full 

 supply of mineral manure only is provided, as compared with 

 that of organic matter, also again teaches how imperative it is 

 that there be a liberal provision of such matter in the soil, if we 

 wouhl produce the largest crop which the characters of the 

 season admit of. 



The results ah-eady selected from the table do not, however, 

 show us whether this required supply by manure of matter for 

 organic formations should be more prominently nitrogenous, as in 

 the case of wheat, or carbonaceous. This point we shall presently 

 recur to ; but, before doing so, shall study the effects of varying 

 the mineral supply by manure. 



The average weight of bulb, as effected by the amount of free 

 phosphoric acid, or superphosphate of lime, supplied to the soil 

 by manures, is here given : — 



Plot 

 Nos. 



Description of Drilled Manures. 



Average weight of Bulbs, in lbs. 



Drilled 

 Manures 

 only. 



Drilled 

 Manures, 



and 10 cwt. 



Rape-cake 

 per Acre. 



Drilled 

 Manures, 

 and 3 cwt. 

 Sulph.Am. 

 per Acre. 



Drilled ; 



Manures, 

 and 10 cwt. 

 Rape-cake 

 and 3 cwt. 

 Sulph. Am. 



per Acre. 



8 

 9 



10 

 11 

 21 



400 lbs. calcined bone-dust . 

 400 lbs. calcined bone-dust and| 

 hydrochloric acid = 268 lbs. sul-> 



400 lbs. calcined bone-dust and 134 J 



400 lbs. calcined bone-dust and 268) 



400 lbs. calcined bone- dust and 400) 



0'92 

 1'02 



MB 

 1-23 

 1-22 



MO 

 M6 



1-33 

 1-33 

 1-41 



0-96 



0- 99 



1- 25 

 M9 

 MO 



0-97 

 0-87 



MO 

 Ml 

 M8 





Mean of the results by sulphuric acid 



1-21 



1-37 



M8 



M3 



It is seen that, under all the varying conditions of organic 

 supply, the undecomposed bone-dust produced less effect than 

 the decomposed. Hydrochloric acid has caused a slight increase 

 in bulb where there was no organic manure, and where rape-cake 

 or ammoniacal salt only was added ; but where ammoniacal salt 

 and rape-cake were employed together, the formation of bulb was 

 less than by undecomposed bone-dust. But a reference to divi- 

 sion 2 of the Table of collected results will show, however, a 

 much larger quantity of leaf under the action of hydrochloric acid, 

 — and, in fact, there was more general growth than by undecom- 

 posed bone-dust, though but little tendency to form bulb ; yet 

 there is little doubt that eventually^ if allowed to mature, the 



