MANURING EXPERIMENTS WITH PADDV RICE. 389 



Phosp 

 per 



loric acid 

 frame. 



Kinds of phosphatic manures. 



Yield per frame 1894 



Appl icfl 

 ill 

 iSqo. 

 Grms. 



Unrccov ered 

 in 



* J J' 



< jims. 



Straw. 

 Grms. 



r uii 

 grain. 



Grms. 



Empty 

 grain. 



Grms. 



\ V Hole 

 crop. 



Grms. 



0 



0 



Xo phosjihatic manure 



260 



177 



c 



J 





3-89 



2.624 



Double superphosphate 



2J.6 



I TO 



6 



J22 



7.7S 



5438 





248 



163 





414 



4-59 



2.898 



Precipitated [ihosphate 



217 



i'?6 







9.18 



6.418 





24.> 



/J 





42S 



6.97 



5-744 



Peruvian gnano 



28; 



211 



0 



V 





1394 



11.643 





200 



21S 



Q 





6.88s 



5.142 



Thomas phosphate 



276 



196 



6 





13-77 



10.686 





201 



212 



6 





6.885 



5.289 



Steamed bone dust 



234 



167 



6 



407 



13-77 



10.059 





277 



219 



6 



502 



6.885 



5-279 



Crude bone dust 



219 



143 



4 



466 



13-77 



10.245 



M >> j> 



280 



200 



7 



4S7 



6.885 



6.103 





219 



140 



4 



363 



13-77 



12.158 





266 



189 



6 



461 



6.885 



6.490 





275 



202 



9 



466 



13-77 



13-043 





275 



209 



5 



489 



Now in order to see clearly the after effect of these phosphatic 

 manures we have calculated the extra-yield caused by the residual 

 phosphoric acid in the last three experimental years : 



