Growth and Seed Yield Production of Yam Bean(Pachyrhizus erosus (L) Urb.) at Borabue District, Maha Sarakham Provice

Abstract

This research was to study on growth, seed yield production and seed quality of yam bean (Pachyrhizus erousus) at Nongsim village farmer’s field, Borabue district, in Maha Sarakham province during August 2005 to November, 2005. Drilling method ofr growing by 1 seed/hill, plant spacing was 10x10 cm. Yam bean growth namely plant height, leaf number, leaf, stem, tuber and total dry weight were recorded every fifteen days as well as seed yield and seed quality at final seed harvesting stage. Results showed that plant height, leaf number, stem and total dry weights as above ground plant parts were slowly increased in vegetative stage at 30-75 days after seeding. And its steady in reproductive stage of growth at 75-120 days after seeding whereas tuber dry weight was increasing but leaf numbers were decreasing. Seed yield production and seed quality in final harvest: yam bean had pod number, seed number, 100 seed weight and seed yield were 4.79 pods/plant, 9.4 seeds/pod, 17.85 g/100 seeds and 771.2 kg/rai respectively. For seed quality, yam bean seed from growing in Borabue district tended to have higher seed germination index than yam bean seed from growing in Chanthaburi province, Yam bean seed from growing at Borabue had seed germination percentage, seed germination index and seeding growth rate were 90.4% 13.83 and 0.13 g/plant respectively.