A collection of 167 winged bean stocks (PsophocaTpus tetTagonolobus (L.) DC.)
was evaluated at the Mayaguez Institute of Tropical Agriculture in Puerto
Rico. Dry seed yield per plant averaged 156 g and ranged from 43 to 328 g.
These data were extrapolated to a mean protein yield of 479 kgjha with a
range offrom 136 to 1062 kgjha. Oil content varied from 14·3 to 19·1 per cent
with a mean of 16·79 per cent. Protein content (C) and dry seed yield (Y)
were inversely related (Ce=35·4-O·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 three stocks with very low yields were eliminated
from the analysis. Plants produced an average of 311 mg of protein per
day with a range offrom 113 to 697 mgjday. Protein production per day and
total dry seed yield per plant are apparently very strongly correlated.