Corn Grain Yield and Growth Indices Affected by Planting Patterns and

Document Type : Research Article

Authors

Tehran

Abstract

In order to study the effect of planting pattern and herbicide application on corn (Zea mays L.) grain yield
and growth indices, an experiment was carried out during 2007 at Varamin Research Station of Plant Protection
Research Institute. The experiment was conducted randomized complete block design in a split plot based on
with four replications. Experimental factors consisted of planting patterns at four levels were including one row
planting on each ridge with recommended density (74,000 plant ha-1), two rows planting on each ridge with
recommended density (74,000 plant ha-1), %25 (92,500 plant ha-1) and %50 (111,000 plant ha-1) more than
recommended density in main plots and herbicides at 5 levels were including Atrazin 1 Kg ha-1 plus EPTC 4 Kg
ha-1, Atrazin 1 kg ha-1 plus EPTC 5 kg ha-1, Atrazin 1 kg ha-1 plus EPTC 6 Kg ha-1, Atrazin 1 kg ha-1 plus
Allachlor 5 Kg ha-1, EPTC 6 Kg ha-1 in subplot. Weed-free and weedy check controls were added to treatments.
Results indicated that two rows planting patterns increased grain yield and physiological indices. Two rows
planting on each ridge with %25 more than recommended density had better performance. Highest grain yield
and physiological indices was obtained in weed-free control. Herbicide treatments were significantly controlled
weeds so grain yield had no significant difference in comparison with weed-free control. As a conclusion, two
rows planting on each ridge with %25 more than recommended density (92,500 plants ha-1) and application of
Atrazin 1 kg ha-1 plus EPTC 5 L ha-1 as pre-planting were the best treatments for weed control in corn.

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