386 



EXPERIMENTAL STATIONS — TURNIP CROP 1882. 



more so than they have been in any previous year. The details 

 are as follows : — 



No. XVI. — Quantity Plots — Pumpherston. 



The half with one-third less than the normal quantity of 

 manure has given an exceedingly poor crop, and the winter 

 application has done worst. The half with one-third more 

 than the normal manure has yielded more than double the 

 crop of the other, and in this case the advantage lies with 

 the winter manuring. When these results are compared with 

 those obtained on the plots of which they are duplicates, and 

 which received the normal quantity of manure, the relation 

 between the quantity of manure and the crop becomes very 

 apparent. The two-thirds manure crop is a failure and a loss ; 

 the three-thirds or normal manure shows an enormous increase, 

 quite disproportionate to the amount of manure added. The 

 manure was increased by one-third and the crop has increased 

 by more than two-thirds ; instead of 8 tons 15 cwt. there is 

 olatained an average of 15 tons 8 cwt. per acre. When four- 

 thirds the normal manure is applied another great increase is 

 observed ; the crop is raised to 20 tons 13 cwt. on an average. 

 The first increment of manure raised the crop 6 tons 13 cwt. 

 per acre, the second increment raised it 5 tons 5 cwt. per acre, 

 and had there been a third and a fourth increment of manure 

 there would have been a further though of course smaller aud 

 smaller increase in the weight of crop. By means of a simple 

 experiment such as this we are able to discover what is the 

 amount of manure which can be most profitably applied in 

 growing a crop of turnips. In this case the average price of 

 the manure applied would be about £3 per acre. We may 

 therefore put the cost of manure against the crop thus — 



