Table 4. Effect of defoliation treatments on partitioning of the vegetative and reproductive fractions of Triticum dicoccoides: 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)§
111***
99a
87b
85b
***
103a
84b
83b
***
NS
Vegetative biomass (g DM)
85***
75
70
75
NS
81a
70b
70b
*
NS
Reproductive biomass, spikes (g DM)
25***
24a
16b
9c
***
22a
14b
13b
***
NS
Reproductive plants (%)
23***
24a
19b
12c
***
22a
17b
16b
***
**
No. tillers/plant (15 April)
2.5***
2.5
4.5
4.8
NS
3.1a
4.8b
5.8c
***
***

* 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.