Abstract
In the Faculty of Agriculture - University of Khartoum – Sudan, experiments were conducted in both winter and rainy seasons to assess the impact of the synthetic auxin 2,4-dichloro phenoxy acetic acid (2,4-D) on the relationship between leaves carotenoid content and the mortality percentage of mesquite trees (Prosopis juliflora). Mesquite trees of small, medium, and large sizes were treated with the 2,4-D at four weights 6-, 12-, 18-, and 24-grams’ active ingredient, each dissolved in either diesel oil or water. The results indicated that the three sizes treated with different weights of herbicide dissolved in diesel showed a high mortality percentage and fewer leaf carotenoid levels, compared to the same weights of 2,4-D dissolved in water. During the rainy season, the high weight of 2,4-D (24 grams a.i.) dissolved in water resulted in a high mortality percentage and lower carotenoid levels, compared to the other 2,4-D weights dissolved in water. The study concluded that; 2,4-D increased the negative relationship between mesquite mortality percentage and the leaf's carotenoid content.
Published Version
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