September, 1909,] 



201 



Saps and Exudations. 



The field of 160 trees was divided in 4 

 plots of equal size, each plot containing 

 4 rows of 10 trees =40 trees per plot. 



Plot O, of 40 trees remained unmanured. 

 Plot NPK, (Nitrogen-Phosphoric acid and 

 Potash, received 80 lb. 



C Ammonia super- 

 of a mixture I phosphate 55 ,, 



containing \ Muriate of Potash 



V. and Bonemeal 25 ,, 



Each tree received 2 lbs. of this 

 complete manure. 

 Plot NP, received the Ammonia 



Superphosphate and Bonemeal 55 lb. 

 but no potash, each tree get- 

 ting 22 oz, 

 Plot N, received the Ammonia alone 20 lb. 

 Each tree getting 8 oz. 

 The field had somewhat the following 

 contour: — 



Girths: 

 / 5////09. 5CV . 



y\ 



y v 

 /Plot N.P. V - 



zsy 



40 frees 



\3il5loq iCi-y y^ioi U. 



v ' y. , /Ho trees 



\^ /3'1'loq, 624.25 A 



*#\ 3 ' l5 h « 9 .- A A 



* K , *,/s/ oq *y j/ 



ysv 



The manures in each case were sprin- 

 kled in a shallow trench, 3 inches deep, 

 dug all round the trees 2 feet from the 

 stem, the dug earth being put back to 

 cover up the manures. The plot O, al- 

 though unmanured, was also trenched in 

 order to insure complete similarity of 

 treatment. 



On 31st January, 1909, the girth 

 measurements of the 160 trees were 

 taken, 3 feet from the ground, and the 

 figures were those recorded on sheet A 

 enclosed. 



At that date, the 40 trees (each 2 years 

 old exactly, from seed) of each plot 

 measured respectively :— 

 Total measurement 40 trees. Plot 0.=648 centim, 



= per tree 6§"=y early incremen of girth 3 3/16" 

 Total measurement 40 trees. Hot NPK. = 6'24-25" 



=per tree 6i" = yearly increment of girth 3£" 

 Total measurement 40 trees. Plot NP. = 626-50 ' 



=per tree 6 3/16"=yearly increment of girth 



3 3/32" 



Total measurement 40 trees. Plot N. = 507*20" 

 =per tree 5" yearly increment of girth 2£" 



It will be. seen that plot O, the un- 

 manured plot, showed much better 

 growth than the other plots, by reason 

 of its position at the foot of the slope. 

 We shall have to take this into account 

 in the summing up of the experiment. 

 20 



On 31st of May last, exactly four months 

 after the application of the manures 'too 

 short a period for the manures to have 

 given their full effect) the trees were 

 again measured, the figures being those 

 recorded on sheet B. The trees were 

 measured in the same order as on 

 sheet A. 



Summing up the experiment, we get :— 



Measurement of 40 trees. Plot. O. 648 on 31-1-09, 



802on 31-5-09, Gain=154 centim. 

 Measurement of 40 trees. Plot NPK. 642-25 on 



31-1-09, 799-25 on 31-5-09, Gain = 175 centim. 

 Measurement of 40 trees. Plot NP. 626-50 on 



31-1-09, 767-75 on 31-5-09, Gain = 141-25 centim. 

 Measurement of 40 trees. Plot N. 507 25 on 31-1-09, 



608 on 31-5-09, Gain = 100 -75 centim. 



The fact that the unmanured plot O 

 shows a larger increase than either NP. or 

 N. plots, would be disconcerting were it 

 not that, as already pointed out, the 

 anomaly is explained by the favoured 

 position of the plot at the foot of the 

 slope below the other plots. At the 

 start of the experiment, i.e., on 31st 

 January, it showed far better growth 

 than the other* plots, its yearly increase 

 of girth, as shown above, being at the 

 rate of 3 T e of an inch as compared with 

 the next plot, N, which gave 3& inch. 



