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Weed management in direct‐seeded lowland rice under iron toxic sites in Nigeria
Author(s) -
IMEOKPARIA P. O.
Publication year - 1990
Publication title -
annals of applied biology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.677
H-Index - 80
eISSN - 1744-7348
pISSN - 0003-4746
DOI - 10.1111/j.1744-7348.1990.tb06639.x
Subject(s) - biology , butachlor , propanil , weed , agronomy , soil water , bentazon , paddy field , weed control , toxicology , ecology
Summary Field trials carried out during the wet season of 1987 at Edozhigi in the Southern Guinea Savanna and in 1988 at Bende in the Forest Zones of Nigeria indicate that the performance of rice varieties under iron toxic soils could be improved by delayed flooding due to the application of selective soil persistent herbicides. Yield increments of 33.3% and 76.9% were recorded at Edozhigi when the mixture of oxadiazon plus propanil at 0.5 + 2.4 kg a.i./ha was applied compared with bentazon alone at 3.0 kg a.i./ha under IR26 and Farox 306–3–6 (susceptible). Similarly at Bende, yield increments of 76.1% and 84.6% were obtained when the mixture of piperophos plus dimethametryn at 1.6 + 0.4 kg a.i./ha was applied compared with pre‐emergence butachlor alone at 4.0 kg a.i./ha also under IR26 and Farox 306–3–6. Breeding resistance to iron toxicity will be desirable because of poor peristence of herbicides in warm flooded soils.