Illinois
Fertilizer Conference Proceedings
January 21-23, 2002
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Table 1. Information about soils and sampling sites.
| Site-year |
| Type of information |
1 |
2 |
3 |
4 |
5 |
6 |
| Soil Characteristics |
| Series * |
Downs sil |
Tama sicl |
Will cl |
Will cl |
Cisne sil |
Cisne sil |
| pH |
6.9 |
6.7 |
6.7 |
6.0 |
5.2 |
5.5 |
| Organic C (g kg-1) |
14.3 |
7.2 |
29.4 |
29.2 |
14.3 |
18.5 |
| Total N (g kg-1) |
1.28 |
1.31 |
2.79 |
2.88 |
1.62 |
1.65 |
| Bray-1 P (lb acre-1) |
153 |
170 |
117 |
69 |
222 |
125 |
| Exchangeable K (lb acre-1) |
606 |
664 |
544 |
410 |
232 |
504 |
| PPNT ** (mg kg-1) |
10 |
6 |
6 |
2 |
12 |
4 |
| PSNT *** (mg kg-1) |
13 |
6 |
6 |
7 |
8 |
2 |
| Site Details |
| Rainfall |
normal |
deficient |
normal |
deficient |
normal |
deficient |
| Previous Crop |
corn |
corn |
soybean |
soybean |
corn |
corn |
| Tillage |
mulch |
mulch |
no-till |
no-till |
mulch |
mulch |
| Manure N (lb acre-1) |
0 |
0 |
0 |
0 |
0 |
0 |
| Check yield **** ( bu acre-1) |
140 |
84 |
142 |
29 |
162 (34) |
112 |
| Fertilizer-N response# (%) |
0 |
28 |
17 |
234 |
0 |
76 |
* The suffix included with each series name indicates the textural
class
of the surface 30 cm: cl, clay loam; sicl, silty clay loam; sil, silt loam
** PPNT, preplant nitrate test.
*** PSNT, presidedress nitrate test.
****Value in parentheses indicates N applied (lb acre-1) prior to
the growing season studied
# Calculated as 100 x (optimal yield - check yield)/check yield
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