Page 34 - Volume 1, Issue 2, July 2008

Troyanos & Hipps 86
tion over time and increased by increasing
external supply of Mg (Table 4). At 0 μmol
Mg l-1 the UAR of Mg declined over time
with a greater rate that that at 150 μmol
Mg l-1 whereas, at 1500 μmol Mg l-1 Mg
there was an increase in the RUR over time.
The UAR of K and N followed a cubic equa-
tion over time and there was an increase
with increasing external supply of Mg (Ta-
ble 4). The UAR of Ca and P an increased
Table 4. The effect of Mg external supply on the relationship unit absorption rate of Mg, Ca, K, N
and P (nmol mg-1day-1) and time (days).
0 μmol Mg l-1 150 μmol Mg l-1 1500 μmol Mg l-1
a b c d a b c d a b c d
Mg 29.729 -1.06 0.0124 -0.00005 29.729 -0.667 0.0056 -0.00001 29.729 -0.351 0.0013 0.000031
Ca 200.508 -3.168 0.0066 - 200.508 -2.318 0.0045 - 200.508 -2.075 -2.075 -
K 348.000 -9.967 0.108 -0.00049 348.000 -7.937 0.077 -0.0027 348.000 -7.067 0.063 -0.00017
N 1382.08 -36.183 0.356 -0.00016 1382.08 -29.273 0.266 -0.00096 1382.08 -26.311 0.228 -0.00072
P 53.613 -0.609 -0.609 -0.00073 53.613 -0.392 -0.392 -0.00050 53.613 -0.314 -0.314 -0.00041
Figure 7. The effect of Mg external supply on the [P] in leaves, stems, new shoots and roots of ”Colt”.