EFFECT OF INHIBITION OF WEEDS DRY WEIGHT ON WHEAT GROWTH INDICATORS

Abstract

The experiment was carried out in the experimental field during the winter season of the year 2021-2022. The current study was carried out with the aim of evaluating the efficiency of the herbicide H-199 and comparing it with some herbicides used in the control of companion weeds with three cultivars of wheat and its effect on some growth characteristics. The experiment was applied according to the randomized complete block design (RCBD) with split plot arrangement by four replicates. Cultivars (IPA 99, Sham 6, and Rasheed) represent the main plots, while control treatments (H-199, Chevalier, Pallas, Atlantis, and weedy) represent the sub plots. The results showed the superiority of Pallas herbicide by contributing the lowest dry weight of weeds of 0.8 g, the highest inhibition ratio of weeds dry weight of 99.67%, the highest flag leaf area of ​​48.63 cm², the highest number of tillers 374.9 tiller/m².  Besides, the highest biological yield of 14.207 ton/ha, compared with the comparison treatment that gave the highest weed dry weight of (223.8 g/m²). This treatment recorded the lowest inhibition ratio for the dry weight (0.00%), the lowest flag leaf area (40.33 cm²), the lowest number of tillers (178.6 tiller/m²), and the lowest biological yield (4.805 ton/ha). The results also showed the superiority of the Sham 6 cultivar, as it gave the lowest weed dry weight amounted to 29.7 g, the highest dry weight inhibition ratio amounted to 78.96%. Along with, the highest plant height reached 105.16 cm, the highest flag leaf area reached 50.27 cm², the highest number of tillers reached 353.6 tiller/m², and the highest biological yield reached 13,727 ton/ha. The interaction had a significant effect, as the treatment with H-199 with the cultivar Rasheed and the treatment with Pallas with the cultivar Sham 6. Plus, the treatment Pallas with the cultivar IPA 99, and the treatment with Chevalier with the cultivar IPA 99 gave the lowest dry weight of 0.0, 0.0, 0.0, and 0.0 g, respectively. Treatment Pallas herbicide with Sham 6 cultivar gave the highest inhibition ratio reached 100.00%, the highest plant height reached 110.22 cm, the highest flag leaf area reached 56.16 cm², the highest number of tillers reached 408.7 tiller/m², and the highest biological yield reached 18.615 ton/ha.