28 



PRINCIPLES OF AGRICULTURAL, CHEMISTRY 



According to this experiment, the ratio of i part lime to i part 

 magnesia is most favorable to the growth of rice. An increase 

 or decrease in the ratio reduces the yield, an excess of lime being 

 more injurious than any excess of magnesia. 



Fig. 3. Upper tobacco plant has excess of magnesia, lower plant 

 excess of lime. Loew. U. S. D. A. 



In other experiments Loew 1 found the most favorable ratio of 

 lime to magnesia for some other plants to be as follows : 



1 Bui. Col. Agr. Imp. Univ. Tokyo, 1902, p. 381. 



