14 MANURING EXPERIMENTS WITH PADDY RICE (THIRD YEAR). 
quoted. The grain richest in nitrogenous substances was the 
best. Other analyses made in our laboratory seem to confirm 
that this observation has a somewhat general character. 
It is somewhat surprising to find among the nitrogenous con¬ 
stituents the largest fraction of non-albuminous substances in 
the grain from the plots without nitrogen. Just in this crop 
we might have anticipated that we should find the smallest 
proportion of non-albuminous nitrogenous compounds because of 
the small nitrogen supply which w'e should assume to be greatly 
needed for the production of albuminoids. As the same result 
was, however, obtained also in the analysis of the straw, we 
must lay some stress upon it, hoping to be able to further in¬ 
vestigate this subject with the crops of the subsequent seasons. 
In the ash of the 4 kinds of grain we find similar differences 
as in the case of straw. Wherever one of the essential mineral 
nutrients had been withheld from the manure w'e find that 
nutrient also in the relative minimum proportion in the grain. 
II. Series. After-Effect of Unrecovered Phosphoric 
Acid applied as Sodium Phosphate. 
(Third Year.) 
The plots of this series received in 1889 various quantities of 
powdered sodium phosphate besides much nitrogen as am¬ 
monium sulphate and much potash as carbonate, and in order 
to ascertain how much of the phosphoric acid left by the crop 
of that year was still available in the subsequent seasons, we 
cultivated rice again on the same plots in 1890 and 1891, 
manuring them only with nitrogen and potash in the form of 
the same salts as before. 6 Thus in 1891 we applied per tan 10 
kilogrms. of nitrogen and 10 kilogrms. of potash. 
For the sake of comparison we may here also take into con¬ 
sideration the plots without phosphoric acid and those with a 
6 Bulletin No. 10, p. 11. 
