138 The Philippine Jouryval of Science i9i8 



Table III. — Rate of applications and cost of fertilizers per hectare. 



Cost of 

 Rate of ' fertilizers 

 application! and their 

 per application 



hectare, j per 



hectare. 



Control 



Lime 



Dried blood 



Nitrate of soda 



Sulphate of potash 



Sulphate i^f ammonia 



Sulphate of potash and double superphosphate 



Sulphate of ammonia and sulphate of potash 



Control 



Nitrate of soda and double superphosphate 



Sulphate of ammonia and double superphosphate 



Nitrate of soda and sulphate of ammonia 



Sulphate of ammonia, sulphate of potash, double superphosphate, 



and nitrate of soda 



Sulphate of potash, nitrate of soda, and double superphosphate 



Sulphate of ammonia, sulphate of potash, and double 



superphosphate 



1,000 

 320 

 320 

 320 

 320 

 640 

 640 



640 

 640 

 640 



1,000 

 1,000 



20.28 

 34.10 

 66.41 

 75.96 

 75.96 

 75.96 

 144.58 



134. 80 

 144.36 

 149. 14 



280. 41 

 219. 78 



Nitrate of soda at the rate of 320 kilograms per hectare was 

 added to plot 13 two months after the first application. 



The complete fertilizers were mixed according to the formula 

 8-6-8, that is to say, the ratio between the nitrogen, potash, 

 and phosphoric acid was as 8:6:8, 



The variety used in these experiments, according to a previous 

 investigation by me, matures in about nine months. The canes 

 were analyzed from March 5 to 16 and were harvested from 

 March 13 to 22. The results of the analyses are shown in Table 

 IV, and the field data are shown in Table V. 



Table IV shows that the complete fertilizer plot (plot 14) with 

 nitrogen in the form of nitrate of soda gave the highest purity 

 in the juice; next comes plot 5, to which sulphate of potash 

 alone was applied; and then follows plot 13, which was treated 

 with complete fertilizers and given a subsequent application of 

 nitrate of soda. 



