54 



planted to oats, and the other, to crimson clover. A good 

 stand of oats was ol)tained, but the clover came up 

 very slowly in the unlimed, fertilized pots. On Nov. 17, 

 all clover plants in the unlimed pots to which ammon- 

 ium sulphate had been added were dead; and the un- 

 limed dried blood treated pots carried very poor plants, 

 some of which were dying. Of the limed pots, only those 

 fertilized with ammonium sulphate produced un- 

 healthy plants. All remaining clover plants were re- 

 moved and English peas planted on November 17. 

 Both the oats and the peas were harvested and weighed 

 green on January 7, 1918. At this time, all of the peas 

 on the unlimed pots fertilized with sulphate of am- 

 monia were dead. Some plants in the limed pots of 

 the sulphate of ammonia series, and the unlimed dried 

 blood series, had such poor root development that the 

 entire root growth was pulled out in cutting the plants 

 with a knife. The lateral roots were mere stubs, not 

 more than a fourth of an inch long in some instances. 

 Oats failed on the unlimed suli)hate of ammonia series, 

 and were very poor on the unlimed dried blood series. 

 In the limed series, with nitrogenous fertilizer, a very 

 good growth was made. The average green weight of 

 peas and of oats is given in Table VIII. 



Table VIII. — The Effect of Nitrogenous Fertilizers on 



the Growth of Oats and Peas, in Soil from "Plot 4" 



Alabama Experiment Station Farm. 



TREATMENT 



Av. green wt. in g^rams 



Oats 



Peas 



None I 8.9 9.0 



Lime i 17.8 13.4 



Am. sulphate, 5 grms. | 2.1 Dead 



Am. sulphate, 5 grms., and lime I 62.8 10.9 



Dried blood, 6 grms. I 7.2 i (1.8 



Dried blood, (i grms.. and lime I Go.fi I 14.6 



Oat plants pulled from the unlimed fertilized pots 

 showed severe root injury similar in appearance to 

 that obtained with plants taken from the field, where 

 the addition of dried blood was causing crop failure. 



A further study of the influence of nitrogenous ferti- 

 lizers on tlie development of soluble manganese was 

 made, using the following methods. One hundred 

 gram portions of acid soils collected from various 

 places in Alabama, were weighed into tumblers; and to 

 each sample was added .1 gram of ammonium sulphate 

 in solution. Distilled water was then added to the esti- 



