Critical Period of Weed Control in Corn (Zea mays L.)

پژوهشهای زراعی ایران

Article 1, Volume 9, Issue 4 - Serial Number 24, January 2012, Pages 591-597

Document Type: Research Article

DOI: 10.22067/gsc.v9i4.13220

Authors

R Alizadeh^* ; M. R Tareghiyan; S Mahmoodi; R Tabatabai

Abstract

In order to determine the critical peroid of weed control (CPWC) in grain maize, a field study was conducted
in 2008 in Agricultural Research Station of Esfahan province using a randomized complete block design with 12
treatments and three replications. The treatments consisted of two different periods of weed interference, a
critical weed-free period and a critical time of weed removal were imposed at V3, V6, V9, V12, and R1 (based on
phenological stages of corn development) with a weedy check and a weed-free check. The CPWC was
determined by fitting non-linear regression models of logistic and gompertz equations to the data in range of 2.5,
5, 10 and 15% of acceptable yield loss levels. The CPWC was from 1- to 13-leaf stage (2-54 DAE), 3- to 11-leaf
stage (10-46 DAE), 5- to 8-leaf stage (20-35 DAE) and 6-leaf stage (27 DAE) in Esfahan condition to prevent
yield losses of 2.5%, 5% , 10% and 15% respectively.

Keywords

corn; Critical period; Weed; Competitionl