Effect of weed competition period on aboveground crop biomass production in aerobic rice variety AERON 1 at different growth stages in both seasons (off-season 2010 and main season 2010/2011 (g/m2)).
Weed competition period
Off-season 2010
Main season 2010/2011
Panicle initiation stage
Heading stage
Harvest
Panicle initiation stage
Heading stage
Harvest
Weedy until 2 WAS
191.77a
364.35b
660.71ab
201.89a
328.23ab
669.60b
Weedy until 4 WAS
83.20c
293.42c
631.00b
81.40c
306.60b
652.00b
Weedy until 6 WAS
80.32c
215.00d
443.53d
76.00c
241.14c
431.30d
Weedy until 8 WAS
77.43c
119.42f
235.42e
75.28c
111.00e
205.55e
Weedy check
77.59c
108.29f
169.00f
75.67c
91.59e
130.49f
Weed-free until 2 WAS
165.30b
158.00e
247.48e
151.35b
169.47d
253.67e
Weed-free until 4 WAS
208.57a
302.66c
553.00c
185.48a
302.62b
589.07c
Weed-free until 6 WAS
208.98a
364.7b
664.36ab
197.73a
336.67ab
654.23b
Weed-free until 8 WAS
210.10a
381.85ab
673.00ab
204.16a
353.72a
687.58ab
Weed-free check
209.00a
406.00a
679.45a
202.31a
359.87a
729.33a
Within a column for each factor, means sharing same alphabets are not significantly different at probability level according to least significant difference test. WASâ=âweeks after seeding.
