The days from bag opening to primordia formation ranged
from 3 to 14 days for non-sterilized substrate, 7 to 21 days for
sterilized substrate. Days from bag opening to primordia formation
on substrates C45+R45 + WB10 and C30 +R60
+ WB10 were significantly longer than those on
R80 +WB20, and on substrate C40+ WS40+ WB20 were
significantly longer than those on WS80 +WB20. Addition
of cotton seed hull significantly delayed primordia formation
compared to sole rice straw or wheat straw substrate. Significant
difference between sterilized substrate and non-sterilized
substrate in terms of days from bag opening to primordia formation
occurred on all substrate except C15 +R75 + WB10