56 



The wind-break running parallel with plot 1 is planted 

 with Poix Doux, Inga lamina, a tree largely used in the Island 

 to give protection to cacao and lime cultivations from the 

 wind. Another of the same kind of wind-break is planted at 

 the back of the lime plots on the right, commencing just 

 behind the camphor plot and extending for some distance 

 along the slope. 



As all the principal plots bear a board showing the 

 manurial treatment given to each, a description of the 

 experiments may serve as a sufficient guide to enable the 

 visitor to follow the line of work which is here undertaken in 

 the interests of planters. 



The principal manurial experiments now being conducted 

 in this valley were commenced in 1917, and take the place of 

 those started in 1913 which were considerably disorganized 

 as a result of the damage wrought by the hurricanes of 1915 

 and 1916. 



The present experiments are conducted in 3 series known 

 as original, duplicate and triplicate series, each of which 

 consists of five plots. Each plot is approximately |-acre in 

 extent and contains twenty-four trees which are planted at 

 20 x 20 ft. apart. The trees planted in 1913 which were 

 included in the original experiments came through the 

 hurricanes undamaged and now form series 1 and 2. Series 

 3 consists of old trees planted in 1893. The object in 

 including old trees in the experiments is to ascertain to what 

 degree old trees are able to respond to the application of 

 fertilizers. 



The following treatment given to the 5 plots in series 1 is 

 repeated in series 2 and 3. 



Plot 1 Complete manure, 

 do. 2 Control, 

 do. 3 Mulch. 



do. 4 Nitrogen and Phosphates, 

 do. 5 Nitrogen and Potash. 



By repeating the same treatment three times a comparison 

 of the results obtained from each series allows of a more 

 accurate conclusion being drawn as to the true value of the 

 manures employed. 



