52 
gained, we may expect that they would have been still more 
striking with older vines. The following were the results :— 
Rerurns From Test PLots,oN THREE-YEAR-OLD RasSPBERRIES BY 
Mr. Ewers, CuitpErs, 1892-3. 
Weight of Estimated Weight 
— Raspberries of New Canes 
per Acre. for Next Season,* 
Ibs. oz. per plot. 
Plot 1. Complete manure, light dressing... 2,700 43 
Plot 2. Complete manure, medium dressing 3,000 54 
Plot 8. No manure bei ee ees 2,050 364 
Plot 4. Complete manure, heavy dressing ... 3,500 62 
Plot 5. Same as Plot 2, but no nitrogen... 2,275 35 
Plot 6. Same as Plot 2, no phosphoric acid 2,750 45 
Plot 7. Same as Plot 2, no potash ae 2,850 47 
Plot 8. No manure aay sie ar 2,000 49 
Plot 9. Same as Plot 2, but nitrogen given as 2,900 62 
_ nitrate of soda 
Plot 10. Same as Plot 2, but twice as much 8,300 65 
potash 
* The weight of the new canes was estimated by measuring their length and thickness: 
by multiplying these together the cubical contents were approximately ascertained, and 
from this the weight was readily calculated. 
Compare the yields from Plots 1, 2, 8, and 4. The increased 
yields on Plots 1, 2, and 4 are 650 lbs., 950 lbs., and 1,430 Ibs. 
Plot 1 is a little high relatively to the others, but such irregu- 
larities often occur if we take only one series of plots or only one 
season’s yield. If the increase in that plot had been only 500 lbs. 
then the series would have been perfectly regular, and would have 
convinced us that this soil would bear the heaviest dressing of 
manure with profit, Now compare Plot 5 with Plots 2 and 3. 
The increase on Plot 5 without nitrogen is only 225 Ibs., as com- 
pared with 950 lbs. with nitrogen. We should, therefore, reason 
that this soil needed all, or nearly all, the nitrogen given in Plot 2; 
and, indeed, if we refer to the second column of figures, showing 
the weights of the new canes which will bear fruit in the coming 
season we shall see that the growth of new canes, without 
nitrogen, was even a little iess than without any manure at all. 
Now let us compare Plots 6 and 7 with the unmanured Plot 8. 
If we were to judge from the yield of fruit alone we should form 
the idea that a great portion of the phosphoric acid and potash 
given in plot 2 could be dispensed with; but if we turn to the 
weight of the new canes we shall see that without the phosphoric 
acid or potash the growth was even slightly less than with no 
manure at all, 
Having, by some method, found out what plant foods our soil 
requires, the next point to be considered is where to get these 
