MANURING EXJ^ERIMENTS WITH PADDY RICE. 385 



Phosphoric 

 acid 



applied 

 per frame 



in 1889. 



Grnis. 



Phosphoric acid not recovered. 



Yield per frame in i8g 



3- 



1889 

 Grms. 



1890 

 Grms. 



1891 

 < 'inns. 



1892 

 ( Irms. 



Straw . 

 Grms. 



Full 

 f^rain. 



Grms. 



grain. 

 Grms. 



Whole 

 crop. 



Grms. 



0. 











161 



95 



2 



258 



4-59 



365 



3-65 



3-53 



3 53 



119 



71 



I 



191 



9.18 



6-99 



6.99 



6-59 



6.5., 



140 



98 



3 



250 



1377 



10.S6 



10.38 



9-73 



6-73 



144 



89 



2 



233 



18.36 



1481 



1392 



13.08 



13-03 



2og 



«47 



3 



359 



22.9s 



>932 



18.09 



16.95 



16.73 



198 



155 



3 



356 



27-54 



23 29 



21-73 



20.66 



20.29 



178 



132 



3 



313 



Complete 1 











574 



486 



10 



1069 











Thus the residues of the phosphoric acid applied in 1889 in the 

 three largest doses had still some effect upon the crop. In the 

 following tabic are shown the proportions of phosphoric acid as- 

 similated by the plants from the residues in the soil. 





I 



2 



3 



4 



5 



6 



Phosphoric acid applied per frame 

 in 1889. Grms. 



1 4 59 



[ 9 '8 



[ 13-77 



[ 18.36 



[ 22.9s 



[ 27-54 



Percentage consumption of the 

 phosphoric acid originally 

 applied in 1889. 



1 20.5 



1 22.8 



1 21. 1 



1 194 



|'5 9 



|'54 









35 



4-5 



5-4 



5-7 









„ 1891 



2.6 



4-7 



46 



50 



50 



39 















0-3 



I.O 













1-3 











0.8 



0.7 



0.4 











In the five years 



23-1 



27.5 



29-3 



29.6 



28.0 



26.7 



The results of these experiments bring into relief the fact that 

 easily soluble phosphatic manures show their chief action soon after 

 application, but that they have but a subordinate effect in subse- 

 quent seasons. These results also prove the fact that the excess of 



