Ikufīziyuluzhī-i Giyāhān-i Zirā̒ī (Feb 2024)
The Effect of Carrier Water Temperature on Glyphosate Efficiency in Pure and Mixed With PC Gate Surfactant in Winter Weeds Control
Abstract
One of the important environmental factors for herbicides efficiency is carrier water temperature. To evaluation of Glyphosate (Roundup) with and without PC Gate surfactant on three weeds of Capsella bursa-pastoris L., Sinapis arvensis L. and Descurainia sophia L. control, three experiments carried out with six doses of applied herbicide active ingredients (a.i.) at the outdoor greenhouse of Agricultural Faculty of Lorestan University, Iran, during 2021. The experiment was in factorial based on completely randomized design with five temperature treatments included 5, 20, 30, 45 and 55 ºC (in dose-response arrangements). The results showed that the dry weight of all three weeds Capsella bursa-pastoris L., Sinapis arvensis L. and Descurainia sophia L. were significant by different temperature and doses application of Glyphosate herbicide (P<0.01). The results showed that the application of temperature treatment and different doses of glyphosate herbicide on the dry weight of all three weeds of sachet, wild mustard and common sorrel were significant (P <0.01). According to EC10، EC50 and EC90 values, the best spray temperature solution was the temperature 30 and 45 ºC with no significant differnt to each other for achieving optimum efficacy of Glyphosate. The whole applied doses (the lowest and the highest) efficiency of Glyphosate were reduced in 5 ºC temperature. The temperatures of 20 and 55 ºC had an average effect on Glyphosate doses efficiency. All the EDs of different temperatures have been reduced using by PC Gate surfactant. Therefore, optimum efficacy of Glyphosate could be ranged at spray solution temperature of ≥ 20 and ≤ 45 ºC. The applied dose of 2050 g a.i ha-1 with PC Gate is also recommended as the best herbicide treatment to control winter weeds.
