USP Theses Collection


Menu



close this section of the library Lal, Rohit


View the PDF document Influence of mucuna (mucuna pruriens) fallow crop on selected soil properties and taro yield in Taveuni, Fiji
Author:Lal, Rohit
Institution: University of the South Pacific.
Award: M.Agri.
Subject: Fallowing -- Fiji -- Taveuni, Soil fertility -- Fiji -- Taveuni, Soil productivity -- Fiji -- Taveuni, Taro -- Yields -- Fiji -- Taveuni, Mucuna -- Fiji -- Taveuni
Date: 2013
Call No.: pac S 602 .8 .L352 2013
BRN: 1195307
Copyright:10-20% of this thesis may be copied without the authors written permission

Abstract: A field study was undertaken to evaluate the comparative effects of grass and mucuna fallow types over 6 and 12 months duration with additional applications of lime and rock phosphate in Taveuni, Fiji. A separate fallow trial was established to investigate the effects of 6 months grass and mucuna fallow on the yield and yield components of taro. A comparative gross margin analysis for taro grown on both the fallow types was carried out. Mucuna fallow had significantly higher (P<0.05) biomass production and accumulated higher levels of N, P, K and Ca in its foliage. However, there were no significant (P>0.05) differences between grass and mucuna fallow on the changes in soil properties over time. Under both fallow types, as the fallow duration increased from 6 to 12 months, total soil OC, N, K, bulk density and earthworm numbers increased significantly (P<0.05). Furthermore, application of lime over 12 month fallow duration significantly (P<0.05) improved soil pH and Ca levels. Application of rock phosphate had no significant (P>0.05) effect on taro yield and soil phosphorus levels under both fallow types and duration. Taro grown under mucuna fallow significantly out-yielded those grown under grass fallow system (11.8 vs. 8.8 t/ha). Overall taro grown under mucuna fallow had 33.5% higher yield than taro grown under grass fallow. Taro leaf area, plant height, leaf number and leaf length significantly differed (P<0.05) between the two fallow types at 120 DAP. Significant associations (P<0.05) were found to exist between taro yield and leaf area (r = 0.75), taro yield and leaf number (r = 0.52), and taro yield and leaf length (r = 0.32). Weed suppression in taro grown under mucuna was significantly greater (P<0.05) than that grown under natural fallow of grass.
Disclaimer & Copyright  l  Contact Us  l  
© Copyright 2004 - 2009. All Rights Reserved.
USP Library
The University of the South Pacific
Laucala Campus, Suva, Fiji
Tel: +679 323 1000