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Growth of Crops in Soils after Herbicidal Treatments for Brush Control in the Tropics¹

Herbicides 4-amino-3,5,6-trichloropicolinic acid (picloram), a 1:1 mixture of the butyl esters of 2,4-dichlorophenoxyacetic acid and 2,4,5-trichlorophenoxyacetic acid (2,4-D:2,4,5-T), and a 2:2:1 mixture of the isooctyl esters of 2,4-D:2,4,5.T:picloram at 6.7, 26.9, and 16.8 kg/ha (6, 24, and 15 1b/A) respectively, were applied as foliar sprays to control guava (Psidium guajava L.). Six crop species were planted in soil collected from each plot, 1, 2, 3, 6, 9, and 13 months after treatment, to detect herbicide residues and to determine crop tolerance. Corn, sorghum, wheat, rice and cotton could be grown without reduction in fresh weight as early as 3 months after application. Soybeans were the most susceptible crop to herbicide residues.

Key Words: herbicide residues • picloram • 2,4-D • 2,4,5-T • guava

² Research Agronomist, Geneticist, and Agricultural Research Technician, Crops Research Division, ARS, USDA, Federal Experiment Station, Mayaguez, Puerto Rico.

Received for publication May 1, 1968.