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Illinois Fertilizer Conference Proceedings
January 25-27, 1999

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Table 3b. Xylem anion concentrations and the total anion charge (TAC) of measured ions as influenced by 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)
PO4
Malate
stages:
V4
V6
V10
R3
V4
V6
V10
R3

HYBRIDS
  

B73xLH51

 1.2 1.1 0.7 0.7 0.7 1.9 0.6 1.1

LH74xLH123

 1.3 1.1 0.8 1.7 0.5 1,8 0.8 1.5
N SOURCES
 

Urea + NI

 1.2 1 0.7 1.3 0.2 1.2 0.5 1.2

Ca(NO3)2

 1.3 1.1 0.7 1.1 0.9 2.5 0.8 1.5
K SOURCES  

KCl

 1.5 1.2 0.8 1 1.0 0.5 2 0.6 2

KHCO3

 1.1. 1.1 0.6 1.6 0.6 2.1 0.6 0.9

K2SO4

 1.1 0.8 0.7 1 0.6 1.4 0.7 1.1
ANOVA
 

Hybrids (H)
NS
NS
NS
†
*
NS
NS
NS

N sources (N)
*
NS
NS
NS
***
***
NS
NS

K sources (K)
***
*
NS
NS
*
NS
NS
NS

H x N
NS
NS
NS
NS
NS
NS
NS
*

N x K
NS
NS
NS
NS
†
NS
NS
NS

H x K
NS
NS
NS
NS
NS
NS
NS
NS

H x N x K
NS
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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