Yield losses and increases in certain vitamins in cucumbers treated with the herbicide 3-amino-2,5-dichlorobenzoate and urea fertilizer
1982
HANKIN, LESTER | HILL, DAVID E.
In laboratory studies the herbicide 3-amino-2,5-dichlorobenzoic acid (chloramben) inhibited urea degradation when incubated with soil samples or with a pure culture of Enterobacter cloacae, a soil isolate. In the field the herbicide was used in conjunction with urea fertilizer in cucumber plantings. Yield was reduced about 20 percent from an average of 466 grams per plant for untreated plots to 379 g/plant in herbicide-treated plots. Fruit from herbicide-treated plots, although similar in nitrogen content to fruit from untreated plots, contained significantly higher concentrations of niacin and ascorbic acid (5.3 milligrams per 100 grams dry weight of niacin and 45 mg/100 g dry weight of ascorbic acid in fruit from treated plots versus 4.8 mg niacin and 18 mg ascorbic acid in fruit from untreated plots). There was no significant difference in thiamin content in fruit from treated or untreated plots. Thus, the herbicide used should be compatible not only with the plant but also with the fertilizer.
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