3.3. Plant growth and architecture
Growth variables such as total biomass and relative growth rate
were not modified by soil compaction or by soil type (Table 2).
In general, most of the growth and morphology variables showed
a significant interaction between soil compaction and soil type,
which means that the effect of soil compaction varies depending
on soil type. Specific leaf area, leaf mass ratio and leaf area ratio
showed an increase with bulk density in the richer soil (loam soil,
type I) (Table 2). However, the same variables showed a decrease
with soil compaction in the poorer soil (sandy-loam soil, type II).
Root mass ratio was affected by soil type with a significant interaction
with bulk density due to a different response depending on the
soil type. For sandy-loam soil, bulk density produced a significant
increase in root mass ratio, whereas in loam soil there was no effect
of bulk density (Table 2). The ratio of root length to plant biomass
(root length ratio, RLR) was negatively affected by bulk density,
but, also, soil type showed a significant interaction with bulk density.
This is because, in loam soil, RLR was negatively affected by
compaction while in sandy-loam it was not significantly affected
(Table 2).
Chemical composition of some tissues was also affected by soil
compaction. Leaf N concentration was slightly incremented with
bulk density in loam soil (r = 0.50; P = 0.06), and root C was negatively
affected by bulk density in loam soil (r =
−0.65; P = 0.01).
3.3. Plant growth and architectureGrowth variables such as total biomass and relative growth ratewere not modified by soil compaction or by soil type (Table 2).In general, most of the growth and morphology variables showeda significant interaction between soil compaction and soil type,which means that the effect of soil compaction varies dependingon soil type. Specific leaf area, leaf mass ratio and leaf area ratioshowed an increase with bulk density in the richer soil (loam soil,type I) (Table 2). However, the same variables showed a decreasewith soil compaction in the poorer soil (sandy-loam soil, type II).Root mass ratio was affected by soil type with a significant interactionwith bulk density due to a different response depending on thesoil type. For sandy-loam soil, bulk density produced a significantincrease in root mass ratio, whereas in loam soil there was no effectof bulk density (Table 2). The ratio of root length to plant biomass(root length ratio, RLR) was negatively affected by bulk density,but, also, soil type showed a significant interaction with bulk density.This is because, in loam soil, RLR was negatively affected bycompaction while in sandy-loam it was not significantly affected(Table 2).Chemical composition of some tissues was also affected by soilcompaction. Leaf N concentration was slightly incremented withbulk density in loam soil (r = 0.50; P = 0.06), and root C was negativelyaffected by bulk density in loam soil (r =−0.65; P = 0.01).
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