Plant Density Effect in Different Planting Dates on Growth Indices, Yield and

پژوهشهای زراعی ایران

Article 18, Volume 10, Issue 4 - Serial Number 28, January 2013, Pages 789-795   

Document Type: Research Article

DOI: 10.22067/gsc.v10i4.21207

Authors

F Azizi^* ; A Mahrokh

Seed and Plant Improvement Institute, Karaj

Abstract

In order to determine the appropriate plant density in different planting dates for sweet corn cultivar
KSC403su, an experiment was conducted using a randomized complete block design in split plot lay out with
three replications at Seed and Plant Improvement Institute in Karaj in 2006. Three planting dates (22 May, 5
June and 22 June) were assigned as main plots and three plant densities (65000, 75000 and 85000 plants per
hectare) were considered as sub plots. Effect of planting date on row/ear, 1000 kernels weight, biological yield
and harvest index was significant at 1% probability level and it was significant at 5% probability level for
kernels/ear row and grain yield. All traits decreased with postponement of planting date to 5 June except for
row/ear, kernels/row and grain yield. More delay in planting from 22 May to 22 June caused that grain yield was
decreased significantly about 32.5% (from 14.45 to 9.78 ton/ha). Effect of plant density was significant at 1%
probability level for all the traits. All of the traits decreased significantly with increasing plant density except for
biological yield. The highest grain yield was resulted from 65000 plants per hectare density (14.20 ton/ha).
Interaction effect of planting date and plant density was significant at 5% probability level for biological yield
and harvest index but it wasn’t significant for the other traits. Growth indices decreased with delay in planting
date and increasing plant density. Only leaf area index increased in more plant densities. From the results of this
experiment it might be resulted that appropriate planting date to produce the highest grain yield is 22 May to 5
June for sweet corn cultivar KSC403su and also the highest grain yield can obtain from 65000 plants per hectare
density.

Keywords

Plant density; Planting date; Sweet corn