Relations of Manganese and Other Cations 



175 



Pot 



Special fertilizer 



Weight 



of plants, 



air-dry 



(grams) 



1 



Control 



.4 gram MnCl2+4 H2O 



10.5 



2 



10.7 



^ ■ { 



4 ...... 



.4 gram MnCl2+4 H2O \ 



.4 gram FeS04+7 H2O / 



.4 gram FeS04-i-7 H2O 



12.9 

 11 6 









The manganese and the iron when used alone each causes a small mcrease 

 in product, but when combined the increase is marked. 



Namba (1908) found that the addition of manganese sulfate as a top- 

 dressing to pots of onions containing eight kilograms of soil results in 

 stimulation. The application of greater amounts than .1 gram MnS04 

 causes a decrease in stimulating effect. 



Loew (1904) found from experiments with pot cultures of soil that 

 manganese stimulates the growth of oats, tobacco, and peas. He found 

 also that the treatment of plots of soil with small quantities of manga- 

 nese stimulates the growth of radishes, potato, and millet. Manganese 

 is more effective when applied as a top-dressing than when mixed with 

 the soil. It is also better to apply the manganese as several top-dressings 

 than to apply all in one dose. 



Bertrand (1905) applied manganese sulfate to a field of oats at the rate 

 of fifty kilograms per hectare. Appreciable stimulation resulted. The 

 gain in the total crop was 22| per cent. Bertrand considers the action 

 of the manganese to be catalytic. 



Labergerie (1908) conducted experiments using manganese as a fertilizer 

 for wheat. His results have been reported as follows: 



" In case of wheat on dry sandy soil containing small amounts of lime 

 both the chlorid and the sulphate increased the yield. On a more moist 

 soil the chlorid decreased the yield slightly and the sulphate caused a 

 small increase. In all cases the sulphate was more effective than the 



chlorid, but both were less effective on wet soil than on dry 



The manganese salts were applied at the rate of 22.27 lbs. of manganese 



