38o V. KOZAl, M. TOVONAGA AND M. NAGAOKA. 



Lastly, as to the consumption of potash by rice, we have 

 obtained the following results : 





Experi- 

 mental 



Potash in the dry matter 

 of the whole crop. 



Totash 

 manure. 



i oiasn 

 extracted 



11 0111 tile bOliy 



resp. soil and 





year. 





C'.nns. 



Grms. 



manui'c. 

 Grms. 



Unmanurecl 



1889 





1.80 



0 



1.70 



,, 



1390 



0.886 



4..6> 



0 



4.00 



,, 



1S91 







0 



2.39 



„ 



1892 



0.481 



1.50 



0 



1-35 



,, 



1893 



0.510 



0.76 



0 



0.61 



>> 



1864 



0.620 



3-37 



0 



3- 1 9 



Without potash 



1S89 





A 78 



0 



4-59 



,, 



1890 



0 ?S6 



4o- 



0 



3-67 



" 



1891 







0 



2.89 



,, ,, 



1892 



0.388 



316 



0 



!3 01 



,, ,, 



1893 



0.315 



2-55 



0 



2.40 



»> >> 



1894 



0392 



3.S2 



0 



3.65 



Comjilete manure 



1S89 



0.710 



925 



9.1S 



9.06 





1890 



0.770 



10.17 



9.18 



9.52 





1891 



0.660 



7-85 



8.33 



7.60 





1S92 



0.533 



5-57 



8.33 



5-44 



)» >^ 



1893 



0,639 



5-79 



8.33 



5.64 





1S94 



0.638 



6.69 



S-33 



6.51 



Thus we sec that the crop grown with complete manure is the 

 richest in potash and that the crop grown without any manure 

 comes next, while the crop supplied with much nitrogen and phos- 

 phoric acid, but not with j^otash, is the poorest in the latter. This 

 proves that the stock of this nutriment in the soil is pretty large 

 and can not be reduced by six successive years of cultivation to the 

 mhiimum, but that at the same time it is not sufficient to secure 

 maximum production. According to the researches formerly made 



