Critical Period of Weed Control in Aerobic Rice

Table 1

Weed composition in season long weedy plots of aerobic rice (Off-season 2010 and main season 2010/2011; summed dominance ratio (SDR ± SE)).

Scientific name	Family name	Weed type	Summed dominance ratio
			Off-season 2010	Main season 2010/2011
Alternanthera sessilis (L.) R. Br. Ex DC.	Amaranthaceae	B	0.8±0.19	0.6±0.11
Amaranthus viridis L.	Amaranthaceae	B	0.8±0.25	—
Axonopus compressus (Sw.) Beauv	Poaceae	G	1.1±0.51	—
Cleome rutidosperma DC	Capparidaceae	B	10.3±2.6	15.3±5.1
Cyperus aromaticus	Cyperaceae	S	2.5±0.81	—
Cyperus distans	Cyperaceae	S	4.1±1.2	2.9±0.86
Cyperus rotundus L.	Cyperaceae	S	9.2±1.9	7.2±2.8
Cyperus sphacelatus Rottb.	Cyperaceae	S	3.5±0.98	—
Digitaria ciliaris (Retz.) Koel	Poaceae	G	1.5±0.51	0.3±0.11
Echinochloa colona (L.) Link	Poaceae	G	3.0±0.76	2.2±1.1
Eclipta prostrata (L.) L.	Asteraceae	B	0.3±0.12	—
Eleusine indica (L.) Gaertn.	Poaceae	G	7.6±2.2	1.7±0.56
Emilia sonchifolia (L.) DC. Ex Wight	Asteraceae	B	0.6±0.10	0.4±0.10
Euphorbia hirta L.	Euphorbiaceae	B	0.7±0.17	4.3±1.34
Fimbristylis miliacea (L.) Vahl	Cyperaceae	S	6.4±2.0	3.2±1.2
Hedyotis corymbosa (L.) Lam.	Rubiaceae	B	1.4±0.39	3.7±1.2
Hyptis brevipes Poit	Lamiaceae	B	1.0±0.22	0.7±0.23
Jussiaea linifolia Vahl	Onagraceae	B	2.2±0.25	6.6±2.9
Leptochloa chinensis (L.) Nees	Poaceae	G	7.0±1.3	1.1±0.30
Mimosa pudica L.	Fabaceae	B	1.3±0.36	6.4±1.3
Phyllanthus niruri L.	Euphorbiaceae	B	1.9±0.42	5.1±0.84
Physalis heterophylla Nees	Solanaceae	B	20.8±5.8	23.7±7.2
Scoparia dulcis L.	Scrophulariaceae	B	12.0±3.4	14.6±4.6

B = broadleaf; S = sedge; G = grass.