Weed Research · 1977 · 22 citations · 1 references
AgricultureAgronomyWeed ScienceCrop ProductionWeed BiologyWeed EcologyCrop CompetitionCrop-weed InteractionsHerbicide ScienceWeed CompetitionWeed ManagementWeed SuppressionCritical Period EffectsCritical Period TimingHerbicide Effects On EmergenceHerbicide Treatment EfficacyMechanical WeedingWeed Competition DynamicsWeed Competition Effects On YieldWeed-crop Competition Management
Summary: In direct‐seeded upland rice ( Oryza sativa L.) yield reductions due to weed competition ranged from 42 to 65% in field experiments conducted in eastern Utter Pradash, India. The most critical period, when crop losses due to weed competition were most severe, ranged from 10 to 20 days after emergence. Yields generally continued to increase, however, as the length of the weed‐free period increased. The weed flora consisted of various grasses, sedges and broadleaved species. The most effective herbicide treatment evaluated was a pre‐emergence application of alachlor followed by a post‐emergence application of propanil or one mechanical weeding.
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