45 



Table 36. Amounts of Nitrogen and Phosphoric 

 Acid in the Entire Plant. 



Thus, it seems that the young rice plant requires a much 

 larger amount of nitrogen than of phosphoric acid, which latter is 

 taken from the soil rather actively late in the plant's life. The rate 

 of the increase of phosphoric acid in the entire plant is lower than 

 that of nitrogen at each stage, as may be seen from the following 

 figures : 



Table 37. Rates of Increase in the Amounts of 

 Phosphoric Acid and Nitrogen 



The stems always contain a larger quantity of phosphoric acid 

 than the leaves,- but this is not the case as regards the nitrogen, 

 as stated before. The amounts of phosphoric acid at each stage, 

 in the stems and in the leaves, bear no definite proportions to the 

 amounts of nitrogen, though these two ingredients are necessary for 

 the formation of protein. The amounts of phosphoric acid in these 

 organs increase till the time of flowering and diminish towards maturity. 

 A greater reduction in the amount of phosphoric acid during matu- 

 ration takes place in the stems than in the leaves, while the decrease 

 in the amount of nitrogen is greater in the leaves. Much phosphoric 

 acid migrates to the grain in the ripening process, and the mature 



