172 TRINIDAD AND TOBAGO BULLETIN. \ XVIII. 3. 



AVERAGE RETUENS PER ACRE. 



The total area under yam cultivation at St. Augustine Experiment 

 Station during 1918 was 20,785 sq. ft. or nearly half an acre, from 

 which 11,613 lb. of yams were reaped i.e. 10-86 tons per acre. 



The value of the crop at three cents per pound wox-ks out at $730.14 

 and the total cost of cultivation including the purchase of plants was 

 $267.83 leaving a profit of S462.31 per acre. The cost of cultivation 

 may appear somewhat high but it must be borne in mind that it is the 

 average for several small plots under experiment, which naturally cost 

 more than under ordinarv conditions. 



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