Agricultural Chemistrij-^ Turnips, 



511 



A glance at the mean results of the two years will, however, 

 clearly show that if the climatic influences of the second year were 

 in the main superior to those of the first, some other circumstances 

 must be looked for, as accounting for the great falling off in the 

 development of the plant. 



Selected and Mean Results. 



Description of Manures. ] 



Average Weight 

 of Bulbs. 



Number of Plants 

 per Acre. 



1843. 



1844. 



1843. 



1844. 





0-52 



0*36 



17,940 



13,736 



Mean of mineral supply only . . • • . 



1-39 



0-73 



19,323 



20,377 









17,043 



5,488 



Mean of mixed mineral and organic supply , 



1-50 



0-97 



17,230 



14,774 



It is here seen, that with a more favourable season, excepting 

 during the first few weeks in 1844, than in 1843, we have never- 

 theless an inferiority of development under every variety of 

 manuring, and a very marked depreciation in the number of 

 plants, unless where mineral manures alone were used. The 

 destructive effects of organic manures^ especially in the absence of 

 rain during the early stages of growth, is here very evident ; and 

 the maintenance of healthy action, even under these same climatic 

 circumstances, when purely mineral manures are employed, is 

 clearly shown. We observe, too, that whilst under the influence 

 of this defect of rain during the first period of the season, both 

 the weight of bulbs and number of plants is much less where 

 rape-cake is used alone than even where no manure at all is pro- 

 vided ; yet the admixture of mineral manures with the organic, 

 gives the best result in the series so far as development is con- 

 cerned. 



That the cause of the depreciation in average weight of bulbs 

 during this season was, nevertheless, connected with a deficiency 

 of matter for organic formations, and not of mineral supply, the 

 following extracted results will show. 



