Table II. Open in new tab Optimized...

Parameter	Low N	High N
Pool size (µg of N)
Substrate pool	12.4 ± 2.4	5.9 ± 1.3
Store	319 ± 120	514 ± 171
Half-life (h)
Substrate pool	3.2 ± 0.5	0.6 ± 0.1
Store	174 ± 32	127 ± 26
Fractional contribution (%)
From direct transfer	52 ± 8	59 ± 8
From mobilization	48 ± 8	41 ± 8
Delay (h)	2.2 ± 0.3	0.9 ± 0.1

Parameter	Low N	High N
Pool size (µg of N)
Substrate pool	12.4 ± 2.4	5.9 ± 1.3
Store	319 ± 120	514 ± 171
Half-life (h)
Substrate pool	3.2 ± 0.5	0.6 ± 0.1
Store	174 ± 32	127 ± 26
Fractional contribution (%)
From direct transfer	52 ± 8	59 ± 8
From mobilization	48 ± 8	41 ± 8
Delay (h)	2.2 ± 0.3	0.9 ± 0.1

Table II.

Optimized parameters of a two-pool compartmental model of N sources supplying leaf growth applied to the tracer time courses of the substrate fluxes into the leaf growth zone of perennial ryegrass plants (Fig. 3), grown with either a low (1.0 mm) or a high (7.5 mm) nitrate concentration in the nutrient solution

The equations describing the model in terms of pool sizes, fluxes, and rate constants are given in “Materials and Methods.” Values ± 95% confidence intervals were calculated from model-optimized rate constants (and the N import flux for the size estimation).

Parameter	Low N	High N
Pool size (µg of N)
Substrate pool	12.4 ± 2.4	5.9 ± 1.3
Store	319 ± 120	514 ± 171
Half-life (h)
Substrate pool	3.2 ± 0.5	0.6 ± 0.1
Store	174 ± 32	127 ± 26
Fractional contribution (%)
From direct transfer	52 ± 8	59 ± 8
From mobilization	48 ± 8	41 ± 8
Delay (h)	2.2 ± 0.3	0.9 ± 0.1

Parameter	Low N	High N
Pool size (µg of N)
Substrate pool	12.4 ± 2.4	5.9 ± 1.3
Store	319 ± 120	514 ± 171
Half-life (h)
Substrate pool	3.2 ± 0.5	0.6 ± 0.1
Store	174 ± 32	127 ± 26
Fractional contribution (%)
From direct transfer	52 ± 8	59 ± 8
From mobilization	48 ± 8	41 ± 8
Delay (h)	2.2 ± 0.3	0.9 ± 0.1

This Feature Is Available To Subscribers Only