May 25,1914 
Transformations of Soil Nitrogen 
103 
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Fig. 2.—Diagram showing relative nitrogen-fixing power, nitrifying power, and salt content of good and 
poor areas in an orange grove that produced a fair crop of marketable fruit. The poor areas were 
unproductive. 1 * 3 Black columns show good areas; hatched columns indicate poor areas. 
0.020 
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Fig. 3.—Diagram showing relative nitrogen-fixing power, nitrifying power, and salt content of soil 
samples from good and poor areas in an orange grove which showed decided symptoms of chlorosis asso¬ 
ciated with small yields of low-grade fruit. There was but a slight difference in the vigor of the orange 
trees 8 growing upon the good and the poor areas. 3 Black columns show good areas; hatched columns 
indicate poor areas. 
1 The samples were collected near Riverside, Cal., in June, July, August, and October, 1912, and Feb¬ 
ruary, March, and June, 1913. The averages of the analyses are given. 
8 The trees of this grove were considered as probably unusually sensitive, because the stock, originally 
budded to lemons, was later budded to oranges, thus leaving a portion of the lemon trunk in the trees. 
3 The samples were collected near Riverside, Cal., in October, 1912, and February, March, and June, 
1913. The averages of the analyses are given. 
