MANURING EXPERIMENTS WIYH PADDY RICE (THIRD YEAR). 
23 
phosphate which are practically equal in effects in the first two 
seasons ; on the first crop the crude bone dust acted the best, 
then followed the steamed bone dust, and finally the Thomas 
phosphate, but these differences were counterbalanced by a 
comparatively better action of the two latter manures on the 
second crop. The phosphoric acid of the Peruvian guano, 
though assimilated in both seasons to the same extent (8.3 
resp. 6.3%), has a very slow effect, so that it would be better 
to convert it into superphosphate before application. The same 
must be stated as to the bone ash and powdered phosphorite. 
