Association of Neurotoxin (ODAP) content in grass pea (Lathyrus sativus L.) with soil properties, seed yield and other agronomic traits.
2002
Wuletaw Tadesse(Researcher)
A variety trial comprising 10 grass pea genotypes was conduced at three location in north-west Ethiopia in the 1995 and 1996 cropping seasons. The objective of the experiment was to study the association among soil, ODAP (Oxalyl Di Amino Propanoic acid) content, grain yield and other agronomic characters in order to develop procedures for the selection of less toxic varieties. The results showed that altitude, soil pH, organic matter and available phosphorus were negatively associated with ODAP content. Agronomic character associations indicated that plant height, days to maturity, number of pods/plant, 1000-seed weight and seed yield were positively correlated with ODAP content suggesting that selection of early maturing varieties with short plant height, small seed size and low podding potential is important to identify varieties with low ODAP content. However, the path analyses showed that maturity and plant height had exerted the largest direct effects on ODAP content followed by seed yield, suggesting that attention must be given to these traits in improving the toxin (ODAP) content of grass pea.
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