130 



THE BOTAmCAL MAGAZINE. 



[Vol. XXY. No. 292. 



Each plot received 9 bundles, each of 12 healthy plants of 

 upland rice, which were reduced later on to 7 of nearly equal 

 size. The variety of rice chosen was Kirishima. The weather 

 conditions w^ere exceedingly favorable during the w^hole time of 

 vegetation and no disturbing factors had occurred. It w^as 

 noticed during the summer that the plants of plot No. 1 w^ere 

 of the most luxuriant development and the color of the leaves 

 w^ere of the deepest green. 



On October 4 the harvest was gathered and the following 

 fresh w^eights obtained : 



Plot. No. 1, Bisulphide of carbon 

 „ „ 2, 200 g. KMnO^ 

 „ 3, 50 g. 

 „ 4, check 



Harvest, g. 

 2962.5 

 2212.5 

 1818.8 ' 

 2248.5 



The harvest w^as now left to become airdry and then the 

 following figures w^ere obtained : 



CS2, 400 g, 

 KMn04 200 g. 



„ 50 g. 



Check 



Aver, 

 hts, cm. 



Total 

 wt., g. 



Wt. of 

 grain, g. 



Wt. of 

 straw, g. 



Aver. 



number of 



branches 



136 



1732.5 



510.0 



1222.5 



5-6 



108 



1083.7 



303.7 



780.0 



4-5 



119 



1040.4 



301.5 



738.0 



3-4 



122 



1233.3 



398.5 



843.8 



4-5 



Camparatiye 



harvest 

 check =100 



140.4 

 87.8 



84.3 

 100.0 



This result show^s for the CS2-plot an increase of total 

 harvest of 40.47^^ ; of grain 30.93% ; the accompanying photo- 

 graph w^ill show the superiority of this harvest. 



It w^as a matter of surprise that a depression of harvest 

 has taken place on the plots with 200 g. and 50 g. potassium 

 permanganate.^^ This result was the more unexpected as 

 manganese compounds can act as stimulants. The probable 

 explanation is that by the oxidising action of this salt on 

 humus injurious acids w^ere produced. 



4. Other authors have observed an decrease after application of that salt. 



