Table 2. Clipping heights and harvest schedules.
Parameter
|
Treatment no.
|
1
|
2
|
3
|
4
|
5
|
6
|
7
|
8
|
9
|
10
|
First year, 1990-1991
|
|
Clipping height (cm)
|
1
|
2.5
|
5
|
1
|
2.5
|
5
|
1
|
2.5
|
5
|
Control
|
Clipping date
|
|
6-8 Feb |
-
|
-
|
-
|
-
|
-
|
-
|
+
|
+
|
+
|
-
|
4-7 Mar |
-
|
-
|
-
|
+
|
+
|
+
|
+
|
+
|
+
|
-
|
21-27 Mar |
+
|
+
|
+
|
+
|
+
|
+
|
+
|
+
|
+
|
-
|
17 Apr-9 May |
+
|
+
|
+
|
+
|
+
|
+
|
+
|
+
|
+
|
+
|
Second year, 1991-1992
|
|
Residual fraction
|
0.125
|
0.250
|
0.500
|
0.125
|
0.250
|
0.500
|
0.125
|
0.250
|
0.500
|
Control
|
Clipping date
|
|
22-29 Jan |
+
|
+
|
+
|
+
|
+
|
+
|
+
|
+
|
+
|
-
|
4-9 Mar |
-
|
-
|
-
|
+
|
+
|
+
|
+
|
+
|
+
|
-
|
29 Apr-5 Mar |
-
|
-
|
-
|
-
|
-
|
-
|
+
|
+
|
+
|
-
|
28 Apr-10 May |
+
|
+
|
+
|
+
|
+
|
+
|
+
|
+
|
+
|
-
|
Note: Triticum dicoccoides was clipped on the first date in each range, Hordeum bulbosum on the second. The minus sign (-) stands for "not havested," the plus sign (+) for "harvested." The last harvest was at the end of the growing season on the final date given, which varied among treatments. At that time, aboveground biomass in all containers, including the control, was clipped at ground level. Corms of H. bulbosum were harvested separately.
In the first year, clipping height was fixed at three levels above ground. In the second year, clipping height was determined as a fraction of plant height in each container.