THE LIME-MAGNESIA RATIO 91 



Bearing on the same subject JMaki and Tanaka'^ attempted to 

 bring back to good producing condition a soil which they call 

 "overhmed." In doing so they grew barley in pot experiments 

 and treated the soil with varying quantities of magnesium in 

 the form of magnesium sulphate. Their work seems to indicate 

 that one-twentieth as much magnesia in that form is needed to 

 bring an overlimed soil into good condition as is necessary of mag- 

 nesia in the form of magnesite. 



Namikawa^^ carried out investigations on the "lime factor" for 

 flax and spinach and found that the best ratio of lime to mag- 

 nesia for these two crops was 1:1. The experiments were simul- 

 taneously carried out with those in the foregoing investigations 

 which have just been discussed. 



Like Aso, Nakamura^^ found in pot experiments with the mul- 

 berry that a proper ratio of lime to magnesia is necessary for the 

 favorable development of that tree. He found that 3: 1 (CaO: 

 MgO) w^as necessary. 



In work carried out about the same time, Kanomoto^^ found in 

 working with oats, rice, barley, buckwheat, mustard and onions, 

 even more strikingly positive results than other Japanese inves- 

 tigators above cited who worked with similar crops, again em- 

 phasizing, according to that investigator, the necessity of the 

 proper lime-magnesia ratio for the proper development of those 

 plants. Confirming the work of Kanomoto, Sirker^^ found that 

 the ratio of lime to magnesia for oats was 1 : 1 , in a series of in- 

 vestigations carried out in Japan. 



Contemporaneous with the last investigations reviewed were 

 those of Bernardini, reported in two papers, one in joint author- 



1^ Bui. Col. Agr. Tokyo, Japan, vol. 7, p. 61. Cited from E. S. R., vol. 18, 

 p. 14. 1906-07. 



'5 Bui. Col. Agr. Tokyo, Japan, vol. 7, p. 57. Cited from E. S. R., vol. 18, 

 p. 32, 1906-07. 



"> Bui. Imp. Cent. Agr. Exp. Sta. Tokyo, Japan, vol. 1, p. 129. Cited from 

 E. S. R., vol. 19, p. 102, 1907-08. 



'' Bui. Col. Agr. Tokyo, Japan, vol. 7, p. 599. Cited from E. S. R., vol. 20, 

 p. 321, 1908-09. 



'« Chem. Abst., vol. 4, p. 48. Cited from E. S. R., vol. 21, p. 624, 1909. 



THE PLANT WORLD, VOL. 19, KG. 4, 1916 



