Quantifying the interaction of reduced doses of herbicide and the amount of seed used on dry matter production of wheat (Triticum aestivum L.) and weeds
Subject Areas : Journal of Plant Ecophysiologyسعید سعیدی پور 1 , moslem chaab 2
1 - هیات علمی دانشگاه آزاد اسلامی شوشتر
2 - MSc student
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Abstract :
Reducing herbicide use without compromising yield can lead to less environmental damage and lower production costs. In this research, a field experiment was conducted in the form of split plots in the form of randomized complete blocks with four replications in the research farm of Shushtar branch of Islamic Azad University in the crop year of 2021-22. The amount of seed consumed including 120, 140, 160 and 180 kg/ha as the main plot (to reach to the densities of 300, 400, 500 and 600 plants.m-2) and the herbicide dose of Mesosulfuron Methyl + Iodosulfuron Methyl Sodium + Diflufenican + Mefenpyridiethyl with the brand name (Otello AD) at six levels of 0, 0.2, 0.4, 0.6, 0.8 and one times the recommended dose (1.6 liters per hectare) were considered as subplot. The results of the experiment showed that the dose required for 50% reduction of the dry matter of weeds at a density of 300 plants m-2 was 66% of the recommended dose. Increasing the density led to a decrease in the dosage of herbicide. So that in the density of 600 plants m-2 it reached 30% of the recommended dose. It was also possible to achieve wheat dry matter of about 500 g m-2 with a density of 320 plants m-2 with 100% of the recommended dose or with a density of 600 plants m-2 and 70% of the recommended dose. The competitive power of weeds decreased from 0.003 at a density of 300 plants m-2 to 0.002 at a density of 600 plants m-2. Therefore, at a density of 300 plants m-2, about 184 g and with an increase in density up to 600 plants m-2, about 904 g per square meter of weed dry matter was needed for a 50% reduction in crop plant biomass.
