Investigation of plant density and nitrogen levels on maize phyllochron and leaf appearance rate

Document Type : Research Paper

Authors

1 Ph. D. Student, Islamic Azad University of Tabriz

2 Assistant Professor, Department of Agronomy and Breeding Science, Faculty of Agriculture, University of Ardabil

3 Assistant Professor, Department of Agronomy and Breeding Science, Faculty of Agriculture, Universcity of Uormia

Abstract

In order to investigate the effect of plant density and nitrogen levels on leaf appearance rete of corn, a split plot experiment based on randomized complete block design with  three replications was conducted in Ardabil Agriculture Research Station in 2005 . Factors were: nitrogen levels in main plots (0,75 and 150 kg N ha-1 ) and plant densities in sub plots (7, 9 and 11 plants m-2) The results showed that the effect of plant density , nitrogen levels and the interaction of the studied factors were significant on phyllochron and leaf  appearance rate. With increased nitrogen levels, the phyllochron was decreased but rate of  leaf appearance was increased, the revers with increasing plant density, the phyllochron  was increased but rate of leaf appearance was decreased. Maximum leaf appearance rate and minimun of phyllocron was obtained at density of 7 plants m-2  with 150 Kg N ha-1. The  highest vegetative growth period and yield of corn was obtained with increasing plant density and it was found maximum in density of 11 plants m-2 and 150 Kg N ha-1 . Flowering coincidence period duration was decreased with increase in plant density but it wasn't  effected by nitrogen levels. Flowering coincidence period was effected by plant density Í nitrogen levels lnteraction. Mean comparison showed that maximum flowering coincidence period was obtained in densityof 7 plants m-2 with application 75 Kg N ha-1. Therefore, with increasing plant density and leves nitrogen, increased corn yield, so it was suggested that in order to increasing leaf appearance rate and grain yield was respectively applied 7 and  11  plant density with 150 kg N ha-1

Keywords


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