Integrated Weed Management by Post Emergence Mixing Application of Atrazine and 2,4-D M.C.P.A in Corn (Zea mays) silage

Subject Areas : Weed Research Journal

Seyed davoud Sajadian ¹ , Mohammad Hassan Rashed Mohassel ² , Kamal Hajmohammadnia Ghalibaf ³

1 - Ph.D. Student, Department of Agrotechnology, Faculty of Agriculture, University of Ferdowsi Mashhad, Mashhad, Iran
2 - Professor, Department of Agrotechnology, Faculty of Agriculture, University of Ferdowsi Mashhad, Mashhad, Iran
3 - Assistant Professor, Department of Agrotechnology, Faculty of Agriculture, University of Ferdowsi Mashhad, Mashhad, Iran

Received: 2023-05-06 Accepted : 2023-12-14 Published : 2024-05-04

Keywords: Chemical control, Cultivator, Mechanical control, Herbicide’s mixture, Weeds management,

Abstract :

Weed control in corn conducted with various methods including chemical and mechanical or integrated of two mentioned methods. Atrazine is basic herbicide for many weeds control programs in USA. Atrazine is herbicide with good contact effect can be used as a post-emergence herbicide in corn. 2,4-D yet is an important part of weed control programs in the world and effective for many broad leaves weed control. Herbicide’s mixture can broaden weed control spectrum in crop such as corn. Herbicide’s mixture and cultivation caused effective weed control and reduce amount of herbicides application. In order to evaluate mixing and post emergence application of Atrazine and 2,4-D M.C.P.A on corn silage an experiment conducted in split plot factorial arranged in randomized complete block with three replication. Main factor was cultivation with three level 0, 1 and 2 time per hectare (respectively C1, C2 and C3) and factorial combination of Atrazine and 2,4-D M.C.P.A as a sub factor including Atrazine Wetable powder (%80 active ingredient) with 0, 1 and 2 kg per hectare (respectively A1, A2 and A3) and 2,4-D M.C.P.A soluble liquid (%67.5 active ingredient) with 0,.75 and 1.5 lit per hectare (respectively T1, T2 and T3), petroleum oil with Ghazal Shimi brand as an additive mixed with spraying solution as much as 1 liter per hectare in treatments with Atrazine to increase contact effect of Atrazine post emergence application. In this experiment Cocklebur and Common Lambs quarter were more sensitive broad leaves weeds to 2,4-D M.C.P.A but Purslane, Prostrate pigweed amaranth, red root pigweed and Jimsonweed were less sensitive. In narrow leaves weeds (grasses) Barnyard grass was sensitive to atrazine whereas Foxtail and Crab grass were tolerated. Effect of Cultivation, Atrazine and 2,4-D M.C.P.A on corn dry matter were significant (α=1%), so that one kilogram Atrazine per hectare caused significant dry matter increase in corn. Increase Atrazine application to two kg per hectare caused decrease in corn dry matter but was more than zero Atrazine and not significant. With increase 2,4-D M.C.P.A application from 0.75 to 1.5 liter per hectare, corn dry matter increased significantly. Interactions between cultivation, Atrazine and 2,4-D M.C.P.A were not significant. In simple effects of treatments, two-time cultivator (C2), one kilogram Atrazine (A2) and 1.5 liter 2,4-D M.C.P.A per hectare caused 21, 29 and 42 percent increase in corn dry mater, respectively.