A collection of 167 winged bean sto

A collection of 167 winged bean stocks (P. tetragonolobus (L.) DC.) was evaluated at the Mayaguez Institute of Tropical Agriculture in Puerto Rico. Dry seed yield per plant averaged 156 g and ranged 43-328 g. These data were extrapolated to a mean protein yield of 479 kg/ha with a range of 136-1062 kg/ha. Oil content was 14.3-19.1% with a mean of 16.79%. Protein content (C) and dry seed yield (Y) were inversely related (Ce = 35.4-0.007Y), so selection for dry seed yield will be more effective than selection for protein content in increasing net protein yield. Dry seed yield was not correlated with either oil content or flowering time. Dry seed yield was related to the number of days to final harvest, but that relationship was lost when 3 stocks with very low yields were eliminated from the analysis. Plants produced an average of 311 mg of protein/day with a range of 113-697 mg/day. Protein production per day and total dry seed yield per plant are apparently strongly correlated.