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Illinois Fertilizer Conference Proceedings
January 25-27, 1993

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Table 2: Recovery in organic forms of N applied as various fertilizers spacer

    Period of incubation (d)‡
Soil Fertilizer† 0 0.5 1 2 4 8 16 30
    --------------------- % ---------------------
Catlin Urea
AS
DAP
AN
 2.4
1.7
3.0
2.0
 11.9
10.8
10.7
7.7
 58.4
69.4
45.4
55.3
 57.8
75.7
51.0
67.0
 58.9
78.2
56.0
66.6
 75.5
77.9
67.2
80.0
 71.8
77.9
66.0
79.0
 71.5
72.5
65.6
75.7
Elliott Urea
AS
DAP
AN
 1.0
3.4
2.6
2.8
 7.3
13.2
13.3
9.9
 29.2
28.5
36.0
20.2
 69.1
81.3
56.1
77.4
 71.5
79.0
43.5
100.8
 85.2
83.1
61.8
99.3
 49.6
81.3
47.2
100.3
 73.0
73.6
63.2
79.8
Drummer Urea
AS
DAP
AN
 3.0
6.4
6.4
7.2
 11.9
7.8
7.9
5.4
 28.2
32.2
36.7
24.8
 59.2
82.8
43.1
58.2
 67.2
78.4
64.5
76.7
 83.3
78.6
70.2
101.3
 66.2
76.0
67.3
101.8
 70.7
72.4
62.8
75.0

†AS = (NH4)2SO4; DAP = (NH4)2HPO4; AN = NH4NO3

‡ Values reported are the mean of 6 observations (2 replications, 3 determinations per replicate).

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