Soil type
Pima sandy
loam
Pima clay
loam
Sunrise loam
Tolleson clay
loam
Tucson loam
Toltec loam
Soil
depth
(cm)
0-3
3-7
7-15
15-30
30-45
45-60
0-3
3-7
7-15
15-30
30-45
3-7
7-15
15-30
30-45
45-60
0-3
3-7
7-15
15-30
30-45
45-60
0-2
2-7
7-15
15-30
30-45
45-60
60-75
0-15
15-41
41-90
II. DESERT ! >OILS
TABLE I (Continued]
Total
phosphorus
(ppm)
1183
1050
822
806
800
714
1720
1562
1611
1232
1125
1320
1210
1010
910
600
790
1100
900
1100
1450
1370
480
495
300
300
310
290
270
580
510
320
tractable
phosphorus
(ppm)
1068
924
780
760
736
696
1500
1408
1512
1165
1060
1312
1160
944
924
568
668
1040
832
1040
1412
1156
334
452
244
238
236
228
192
518
416
324
Organic
P to
total
P
(%)
28
18
18
15
11
3
42
52
50
60
62
19
8
6
5
8
40
52
43
40
29
26
19
36
15
13
18
17
18
13
13
0
)
Organic
P to
tractable
P
(%)
31
20
19
16
11
3
48
57
54
64
66
18
8
6
5
9
47
55
47
42
30
31
27
40
13
13
24
23
27
13
16
0
Ratio
organic
C to
organic
P
22
34
38
41
36
120
45
31
24
12
6
45
85
84
83
70
65
39
35
31
37
32
34
13
67
71
43
52
52
54
54
0
C 0 2
Soluble
organic
P
(ppm)
0 . 3
0 . 3
0.1
0
0.2
0.2
3.3
3.0
2 . 5
0 . 3
0.4
1.8
0.8
0.2
0
0
0.4
0.5
0.1
0.3
0 . 3
0.4
1.7
2.7
0.5
0.1
0.4
0.2
0.1
0 . 3
0.4
0
65
Total
C 0 2
soluble P
(ppm)
4.9
3.3
2.4
1.3
0.9
0.7
19.5
23.1
19.2
3.7
2.0
3.5
1.3
0.5
0.2
Trace
0.6
1.7
1.2
1.4
1.1
2.6
3.3
4 . 5
1.6
0.6
0.7
0.8
0.5
3.0
2 . 8
3.0