Response of Soyabean (Glycine max (l.) Merril) Varieties to Weed Control Treatments and Row Arrangement in the Nigerian Savannah

Description

Download Response of Soyabean (Glycine max (l.) Merril) Varieties to Weed Control Treatments and Row Arrangement in the Nigerian Savannah. Agronomy students who are writing their projects can get this material to aid their research work.

Abstract

Field experiments were conducted during the 2012 rainy season at Samaru located 11⁰ 11‟N 07⁰ 38‟E, 686 metres above sea level in the Northern Guinea Savannah

The experiment consisted of five weed control treatments which included application of Butachlor and Pendimethalin each at 2.5 kg a.i ha^-1, one hoe weeding at 3 weeks after sowing, two hoe weeding at 3 and 6 weeks after sowing and a weedy check with two soyabean varieties

The treatments were laid out in a split plot design with factorial combination of weed control treatments and row arrangement on the main plot while varieties were assigned to the sub-plots. Results indicated that weed dry weight and weed cover score were significantly lower in the weed control treatments than the weedy check plots.

Plots treated with Butachlor at 2.5 kg a.i ha^-1 and those weeded twice at 3 and 6 WAS resulted to significantly higher values for crop vigour, plant height and canopy spread. At 6 and 9 WAS plots weeded once or twice had wider canopy spread at both locations.

Introduction

A city is said to be monocentric in nature when it is characterized by a unicentered Central Business District (CBD). The monocentric city model was formulated by Alonso in 1964 as an adaptation of Von Thunen‟s 1826 theory of agricultural land and land use to the urban case.

This idea was immediately expanded to include production, transport and housing and has been generalized in many ways (Mills, 1967, 1972; Muth, 1969; Fujita, 1989).

Moreover, the basic design model for monocentric city is envisaged as circular residential area or district surrounding CBD in which all jobs are located.

The model further distinguishes between an open city (with perfectly elastic population) and a closed city (with fixed population that is fairly inelastic) (Anas and Kim, 1996).

This city model has been the dominant view of urban land use structure since the early 90s by the urban economists, as it allows for easy generation of rent gradient in transportation friction for commuting or commerce between a city center and periphery (Wheaton, 2004).

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