MANURIX(; EXPERIMENTS WITH PADDY RICE. 383 



Phosphoric 



I'liosphoric acid not 

 recovered. 



Yield per frame in 189 





acid applied 

















per frame in 

 1889. 



in 



in 



in 



Straw. 



Full 



Empty 



Whole 



Grms. 



1009. 



1 090. 



1 09 1. 



Grms. 



grain . 



grain . 



crop. 





Grms. 



Grnis. 



Grms. 





Grms. 



Grms. 



Grms. 



0 









264 



168 



3 



435 



4-59 



3-65 



3.65 



3-53 



279 



165 



3 



447 



9.18 



6.99 



6.99 



6.59 



266 



160 



3 



429 



1377 



10,86 



10.38 



9 73 



263 



181 



2 



446 



18.36 



14.81 



1392 



13.08 



293 



209 



3 



505 



22.54 



19-32 



1 8 09 



16.95 



300 



229 



3 



532 



27-54 



23 29 



21.73 



20.66 



355 



270 



3 



628 









573 



532 



12 



U17 



We sec from the above table that the three smallest quantities 

 of phosphoric acid applied in 1889 had no effect upon the crop of 

 1892, whilst the residues from the larger doses produced some in- 

 crease in the crop. The j ield of grain by the plot supplied Avith the 

 largest quantity of phosphoric acid was 60 higher than that pro- 

 duced without apjilication of phosphoric acid, but it was only half 

 as much as that obtained with a complete manure containing 8.33 

 grms. of phosphoric acid as double superphosphate. Similar results 

 were obtained by the determination of the phosphoric acid taken up 

 by the plants from the residues in the soil, as is sho\\ n in the follow- 

 ing table : 



I'hcsphoric acid grms. 

 per frame. 



I 





3 



4 



5 



6 



Freshly 

 manured. 



In the w liole crop) of 1892. 



0.65 



0.68 



0.77 



083 



1.02 



1. 15 



2.62 



In the crop of 1892 produc- 

 ed without phosphoric 

 acid 



jo.78 



j-0.78 



jo.78 



^- 0.78 



|o78 



|o.78 



|o.7S 



Consumed from the resi- 

 dual phosphoric acid. .. 



1 

 i" 



}- 





I 0-05 



[0.24 



[037 



[1.84 



Residu.d phosphoric acid 



I" 3-53 



[6.56 



[973 



[ «3-o8 



j 16.9s 



1 20.66 



} — 



Amount consumed, in per 

 cent of this residue. 



1 



i 



'/ 

 \ 



1 



1 ~ 



[0.38 





[ 1-79 



1 



