Effect of crop density and application of reduced dosages of two post-emergence herbicides on broadleaf weeds biomass and yield and yield components of broomcorn (Sorghum vulgare var. technicum)

Subject Areas : Agroecology Journal

Hamed Raeisi ¹ , Jahanfar Daneshian ² , Mohammad Ali Baghestani ³ , Soleiman Jamshidi ⁴

1 - M.Sc. Student, Takestan Branch, Islamic Azad University, Takestan, Iran.
2 - Associate prof., Seed and Plant Improvement Institute, Karaj, Iran.
3 - Associate prof., Iranian Research Institute of Plant Protection.
4 - Faculty Member of Miyaneh Branch, Islamic Azad University, Miyaneh, Iran.

Received: 2012-12-27 Accepted : 2013-05-13 Published : 2013-04-21

Keywords: Plant density, herbicide, Integrated weed management, broomcorn, broom yield,

Abstract :

To evaluate the effect of crop density and application of reduced dosage of two post­-emergence herbicides on broom yield of broomcorn, an experiment was carried out in 2011 as factorial based on a randomized complete block design with three replications in Miyaneh region. Treatments were crop densities of 17, 24 and 31 plant. m-2 and herbicides including 2,4-D­+­MCPA and bromoxynil­+­MCPA with recommended, 20% and 40% reduced dosages. For each crop density, a hand weeding plot were considered as control. Results showed that weed biomass was decreased with crop density increasing, and recommended dosage of bromoxynil +­ MCPA was the most effective herbicide treatments in most sampling stages. Also, increasing crop density resulted in increased leaf number and leaf, stalk and panicle dry weight. Besides, broom yield and production efforts were significantly increased with increasing plant density. The highest broom yield was obtained with application of bromoxynil­ + ­MCPA and 2,4-D­ + ­MCPA in recommended dosages. The effect of recommended and 20% decreased dosages of bromoxynil ­+ ­MCPA was similar on broom yield improvement. Regarding to the obtained results, plantin density of 31 plant.m-2 and 20% of recommended dosage of bromoxynil­ +­ MCPA application is recommended to weed control and broomcorn yield increment in Miyaneh region.

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