No. 3 (1921) MANUFACTURE OF FISH OIL AND GUANO 187 



(P2O5, about 8'6 per cent) as phosphate of lime, the latter element 

 (lime) averaging 10 per cent of CaO. Potash appears to be about 

 Yz per cent being below 2 per cent of the ash which itself aver- 

 aged 26 per cent ; hence it is negligible as a manurial item. Its 

 composition therefore shows that while very valuable, it is not a 

 complete manure and it should consequently be used in a mixture, 

 especially compost, whenever a complete, all-round fertilizer is 

 desired. It is very extensively used in Japan, the United States, 

 etc., and is said to be beneficial for root crops. 



82. The following price list (1912 13) of a coastal firm supply- 

 ing planters, etc., with fertilizer, indicates both the estimated 

 quantities of manurial constituents, the price required for the same 

 and, incidentally, the comparative manurial value, chemically 

 estimated, of guano and beach-dried fish : — 



Rupees per 



ton bagged 



f.o.r. 



(1) Fish guano, guaranteed, 8 to 9 per cent N, and 



7 to 8 per cent phosphoric acid ... ... 100 



(2) Milled fish, 5 to 6 per cent N, and 4 to 5 per 



cent phosphoric acid ••• ••• ... ... 55 



(3) Fish-manure (no guarantee) ... ... ... 40 



Number (3) is the ordinary manure obtained by drying fish on 

 the sand and necessarily contains much adhering sand which 

 partly accounts for its low price. 



Another analysis obtained from the College of Agriculture, 

 Coimbatore, is as follows : — 



Beach-dried sardine. 



Water 6'5 to I5'0 



* Organic ... 36"5 to 6o*00 

 Ash I8*4to4ro 



lOO'OO 



