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Transport of nutrients and postemergence-applied herbicides in runoff from corrugation irrigation of wheat



Transport of nutrients and postemergence-applied herbicides in runoff from corrugation irrigation of wheat



Meyer, M. T. , Thurman, E. M. Acs Symposium Series; Herbicide Metabolites In Surface Water And Groundwater: 151-164



Transport of plant nutrients and postemergence-applied herbicides was monitored in runoff water from four irrigations of a 12.6-ha wheat (Triticum aestivum L. cv. Owens) field. Cumulative loss of dissolved N was 8.25 kg and corresponded to 0.73% of that applied as fertilizer. Although no P was applied through fertilization, 2.75 kg of total P was also lost. Total losses of diclofop and bromoxynil from the experimental site were 0.098 and 0.035 kg, respectively, which were equivalent to approximately 1% of the amount of each herbicide applied to the wheat field. This relatively large loss was due to the short interval (7 h) between application and the first irrigation. Much less (0.07%) 2,4-D was transported when the corresponding interval was 7 d. The majority (70 - 80%) of each herbicide was transported in runoff water from the first irrigation after herbicide application. Maximum nutrient fluxes were 5.4 and 2.8 g ha-1 h-1 for N and P, respectively, with corresponding herbicide fluxes being 102, 37.1 and 7.3 mg ha-1 h-1 for diclofop, bromoxynil and 2,4-D.

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Accession: 013215374

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