Table 7. Effect of defoliation treatments on partitioning of the vegetative and reproductive fractions of Hordeum bulbosum: second year.

Component
Control
Clipping frequency
(no. times clipped)
Residual fraction
Interaction


1
2
3
Significance
0.5
0.25
0.125
Significance
Fraction x height
Total shoot biomass
(g DM)§
140
130a
122b
115c
***
136a
116b
116b
***
NS
Vegetative biomass
(g DM)
78**
74a
73a
68b
*
76a
67b
71ab
*
NS
Spikes
(g DM)
7***
7b
8a
3c
***
6
6
6
NS
NS
Corms
(g DM)
55***
48a
41c
46b
***
53a
42b
38c
*
*
Reproductive fraction (%)|
45*
43
40
41
NS
44a
42ab
38b
*
*
No. tillers/plant
(17 April)
5.3***
7.2a
9.7b
13.1c
***
8.7b
10.8a
10.5a
*
*

* P < 0.05; ** P < 0.01; *** P < 0.001; NS, nonsignificant.
Difference between the control and the mean of all the defoliation treatments.
In the second year, all treatments were clipped at the first defoliation, two-thirds at the second defoliation, and one-third at the third defoliation. Values followed by different letters are significantly different.
§Values given represent grams of dry matter per container with a soil surface area of 1.25 m2. |Reproductive fraction is spikes + corms.