May 25, 1914 
Transformations of Soil Nitrogen 
hi 
Table IV .—Effect of green manure, straw, pure cellulose, and nitrote on grapefruit 
seedlings growing in greenhouse soil at the Department of Agriculture, Washington , 
D. C.« 
Lab¬ 
oratory 
No. 
Soil treatment. 
Condition of trees after 
19 days. 
Condition of trees after 
57 days. 
Condition after 166 
days. 
734 
Check. 
Normal. 
Normal. 
Normal. 
735 
.do. 
.do. 
Do. 
736 
KNO3 . 
Slightly chlorotic. 
.do. 
737 
.do. 
.do. 
738 
Wheat straw (1 per 
.do. 
Slightly yellowish. 
Yellow and spotted. 
cent). 
739 
.do. 
Normal . 
.do. 
Do. 
740 
Wheat straw (1 per 
Chlorotic. 
Normal. 
cent)+ KNO3. 
741 
.do. 
.do. 
742 
Green sweet clover (1 
.do. 
Normal. 
per cent). 
743 
.do. 
Do. 
744 
Green sweet clover + 
Subnormal. 
.do. 
KNO3. 
745 
.do. 
Chlorotic. 
.. . .do.,. . .. 
■ — 
746 
Green devil’s grass (r 
Slightly chlorotic. 
Do. 
per cent). 
747 
.do. 
... do. 
Do. 
748 
Green devil’s grass -f 
.do. 
KNOa. 
740 
.do. 
Chlorotic. 
750 
Filter paper (1 per 
.do. 
Yellow., 
Yellow and spotted. 
cent). 
751 
ted. 
752 
Filter paper (1 per 
Very chlorotic. 
Normal. 
cent) + KNO3. 
753 
.do. 
.do. 
0 Grapefruit seedlings about 2^ months old were transplanted into 6-inch pots of greenhouse bench soil. 
All organic materials added were cut fine and 1 per cent added dry-weight basis. Nitrogen as nitrate 
was added once a week to Nos. 736, 737, 740, 741, 744, 745, 747, 749, 752, and 753 at the rate of 0.01 percent 
at each application. The spotted condition of the leaves where straw and filter paper were used seems 
to be a symptom of malnutrition in an advanced stage. These leaves showed no "veming ” after the first 
few days. 
