Reaction of Cotton to 2,4-D Different Concentrations

Abstract

Pot Trials were conducted to determine effect of 2,4, -D on cotton and recovery time of injured crops. Cotton was defined as tolerate to 2,4-D if yield reduction was less than 20%. Results in dicated that foliar spraying of 2,4-D as Na salt in solution induced abnormal development of cotton leaves, squaes, flowers, bolls and stem. Cotton yield reduction due to 2,4-D differed greatly between 2,4-D concentration and cotton growth stage.
Spraying at jubenile stage, cotton did not tolerate to 2,4-D at 10 ppm or higher. Spraying a t squaring stage, the crop could tolerate to 2,4-D at 10 ppm but not higher concentration. Spraying at flowering or boll development stage, the crop could tolerate to 2,4-D at 10-100 ppm but not at higher concentration. Recovery time of cotton treated with 10 ppm of 2,4-d was noted as 33, 432 and 34 days for juvenile, squaring and flowering stages respectively. Recovery time slightly increased with 2,4-D rates from 10 to 200 ppm.