Response of Lablab (Lablab purpureus l. sweet) to Phosphorus Application and Cutting Treatments

Description

Download Response of Lablab (Lablab purpureus l. sweet) to Phosphorus Application and Cutting Treatments. Agronomy students who are writing their projects can get this material to aid their research work.

Abstract

Field trials were conducted during the 2006, 2007 and 2008 cropping seasons at the Institute for Agricultural Research (IAR) Experimental Farm, Samaru in the northern Guinea savanna zone of Nigeria, to study the response of lablab (Lablab purpureus (L.)Sweet) to phosphorus application rate, cutting height and cutting age with regards to growth, herbage yield, seed yield and herbage quality.

The treatments were composed of factorial combinations of four levels of phosphorus fertilizer (0, 12, 24 and 36 kg P ha^-1) and two cutting heights (10 and 20cm) in the main plot and four cutting ages (6, 12, 18 weeks and maturity) in the sub-plot of a split-plot experimental design with three replications.

The application rate of 12 kg P ha^-1 increased lablab sward height, 100-seed weight and ground cover score by up to 4% while 24 kg P ha^-1 increased leaf area index (10%), leaf area per plant (18%), number of root nodules (42%) and nodule dry weight (50%) above the control.

Cutting lablab to a 20cm stubble height produced significantly higher sward, ground cover score, pod length and 100-seed weight, whereas a 10cm cutting height produced significantly higher calcium  and phosphorus concentrations in the dry herbage.

Introduction

The problem of inadequate supply and poor quality of fodder for livestock production in sub-Saharan Africa is partly responsible for the food insecurity prevalent in Africa. This scenario could be ameliorated through improvement of the yield and nutritive value of grasses and forage legumes grown for livestock in the region.

The yield, chemical composition and nutritive value of  the grasses and legume species grown in Nigeria vary greatly, depending on the species and period of growth at which the grasses are cut or grazed (Aina and Onwukwe, 2002).

According to Odunze  et al. (2004), ruminant performance in the northern Guinea savanna of Nigeria is affected by seasonal variation in the availability and quality of pasture.

In Nigeria, as well as in other tropical countries, quantity and quality of forage particularly during the dry season, which vary between 5 – 7 months in the savannas, are major constraints for optimum livestock production from the savanna rangelands (Omokanye et al., 2004).

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