Yam Yield Variations From Three-Year Continuous Cultivation Under Sole And Mixed Cropping Systems In An Alfisol Of Eastern Nigeria
Journal Title: Scientia Agriculturae - Year 2013, Vol 3, Issue 3
Abstract
Sole Yam (SY) and Yam+ Cassava + Maize + Pigeon Pea (Y+C+M+P) mixture were grown continuously for three years in an ultisol brought into cultivation as a virgin forestland. The objective was to compare yam yield variations as affected by residue management without external input of nutrients (Zero external input).All the crop residues especially the above ground vegetation (leaves from yam, cassava and pigeon pea and the entire for maize except the cob) were incorporated into the soil as a sources of nutrients. The tuber yields from SY plots were in 1999 and 2000 significantly higher (p < 0.05) than those obtained from Y+C+M+P but in 2001 there was no significant difference between the yields. Again decreases in tuber yield were above 45% between 1999 and 2000 in SY and Y+C+M+P. Between 2001 and 2000 yield decrease in Y+C+M+P was < 5% but in SY plots it was ≈25%. The shape index of tubers was neither significantly affected by cropping systems nor over the three years as the overall variations ranged from 0-9%. Thus variation in yam tuber yields from sole yam plots and mixtures tended to narrow down with time.
Authors and Affiliations
C. LA Asadu, A. G. O Dixon
Keywords
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