104 MAINE AGRICULTURAL EXPERIMENT STATION. I908. 



pany's 4-6-10 goods, Prentiss Aroostook Complete Fertilizer, 

 were analyzed with results given in the table on page 103. 

 Sample 1290 was drawn at Houlton and 1306 at Fort Fairfield 

 in the spring of 1907. Sample 1341 was taken at Houlton and 

 1342 at Presque Isle in October. Sample 1343 was sent to the 

 Experiment Station from Easton. Samples 1344, 1345, 1347, 

 1348 and 1349 were drawn at Easton by a Station chemist in 

 November, 1907. Samples 1350, 1351, and 1352 were drawn 

 at Presque Isle. 



It will be noted that on the average the 13 analyses show a 

 shortage of .46 per cent nitrogen, .37 available phosphoric acid, 

 .43 per cent total phosphoric acid, and .55 per cent potash. 



The valuations placed upon fertilizing constituents by the 

 directors of the New England States and New Jersey for 1907 

 are given in Bulletin 140 of this Station*. The valuation of the 

 Prentiss fertilizer from the guaranteed analysis, following the 

 rule for calculating given on page 71 of that bulletin, is as 

 follows : 



Total nitrogen, 3.29 per cent $13 49 



Available phosphoric acid, 6 per cent 5 40 



Insoluble phosphoric acid, 2 per cent 80 



Potash, 10 per cent 10 00 



Valuation $29 69 



The valuation of the goods as shown by analysis, — average of 

 the 13 samples, is as follows: 



Total nitrogen, 2.83 per cent. $11 60 



Available phosphoric acid, 5.63 per cent 5 07 



Insoluble phosphoric acid, 1.94 per cent 78 



Potash, 9.45 per cent 9 45 



Valuation $26 90 



Difference in valuation, $2.70 or 9.1 per cent. 



The goods were tested for the quality of the constituents. 



Available phosphoric acid may be fairly assumed to be of equal 



agricultural value irrespective of its source ; the potash was 



apparently present in good form ; the availability of the nitrogen 



* The valuations for 1908 are the same as in 1907 and are given on 

 page 90 of this bulletin. 



