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Illinois Fertilizer Conference Proceedings
January 25-27, 1999

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Table 3a. Xylem anion concentrations and the total anion charge (TAC) of measured ions as influenced key hybrid, N source and K source. Xylem exudate was collected from detopped plants at four growth stages.
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TREATMENT
Ion concentration (mm)
 
C1
NO3
stages:
V4
V6
V10
R3
V4
V6
V10
R3

HYBRIDS
   

B73xLH51
2.0
2.4
2.0
ND
13.7
4.9
5.1
1.8

LH74xLH123
1.9
1.4
2.4
ND
12.1
4.9
4.4
0.7
N SOURCES
   

Urea + NI
1.8
1.4
0.1
ND
15.2
6.6
4.9
1.9

Ca(NO3)2
2.1
2.5
2.3
ND
10.6
3.1
4.8
0.7
K SOURCES
 

KCl
3.4
3.6
2.2
ND
11.6
4.6
4.2
0.9

KHCO3
1.2
0.8
2.1
ND
14.0
5.7
5.4
2.0

K2SO4
1.2
1.3
2.3
ND
13.1
4.3
4.6
0.9
ANOVA
 

Hybrids (H)
NS
NS
NS
-
*
NS
NS
NS

N sources (N)
*
NS
NS
-
***
***
NS
†

K sources (K)
***
*
NS
-
*
NS
NO
NS

H x N
NS
NS
NS
-
NS
NS
NS
NS

N x K
NS
NS
NS
-
+
NS
NS
NS

H x K
NS
NS
NS
-
NS
NS
NS
NS

H x N x K
NS
NS
NS
-
NS
NS
NS
NS

†, *, **, ***significantly different at the 0.10, 0.05, 0.01, and 0.001 probability levels, respectively.
ND = not determined.

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