Best Ordinioha Et Al


Best-Ordinioha et al

Greener Journal of Agricultural Sciences Vol. 7 (1), pp. 032-038, January 2017.

 ISSN: 2276-7770 

Research Articles

Manuscript Number: 110716202



Effect of the Application of Different Rates of Herbicides on the Growth and
Yield Component of Zea mays L


Joyce Chinyere Best-Ordinioha, 2Prof. Anthony E. Ataga,

Edache B. Ochekwu


1Doctoral Student, Department of
Plant Science and Biotechnology,Faculty of Sciences, University of Port
Harcourt, Port Harcourt, Rivers State.

2Professor, Department of Plant
Science and Biotechnology, Faculty of Sciences, University of Port Harcourt,
Port Harcourt, Rivers State.

3Senior Lecturer, Department of Plant Science and
Biotechnology, Faculty of Sciences, University of Port Harcourt, Port Harcourt,
Rivers State


Background: Weeds are responsible
for low crop yield, and responsible for the large gap between the potential and
actual yield per hectare. The traditional manual method of weed control in
Nigeria has become very difficult and expensive, because of the cost of hiring
labor, particularly during the peak cropping period, due to increasing
rural-urban migration. This has encouraged the use of herbicides in weed
control, even by untrained illiterate farmers, hence the need to assess the
effects of the use on yield. This study assessed the effects of the application
of different concentration of herbicides on the growth and yield of maize,
cultivated in succeeding years.


Materials and methods: The study
was carried out in a plot of land at the University of Port-Harcourt in 2013
and 2014, using a randomized complete block design with three replicates, and
plot size of 2m x 2m. Glyphosate was used to prepare the experimental plots,
while different application doses of primextra dual gold (atrazine and
metolachlor) were applied to the plots, after planting the maize. The control
plot was not treated with the herbicides. The growth and yield parameters of
the maize planted in the plots were assessed through the physio-chemical
characteristics of the soil, the germination count, leaf count, height of maize
plant, and the yield of maize at harvest.


Results: The
application of the herbicides resulted in improvements in the growth and yield
parameters of the maize. The parameters in the plots in which the herbicides
had been applied at or below the manufacturer’s recommended dose (2.11ai/ha)
were comparable to those of the control; and then significantly decreased in
the plots in which the herbicides were applied in overdose. The parameters were
also higher in the first phase of the study, compared to the second phase that
took place one year later in the same plots. There was also a reduction in the
organic matter and exchangeable minerals content of the soil in the second
phase of the study.


Conclusion: The application of
herbicides for weed control, up to their recommended doses resulted in a
one-off improvement in the growth and yield parameters of the cultivated maize
crop. Efforts are therefore needed to properly educate farmers.


weed control, germination count, yield, growth parameter, maize, Nigeria

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