Abstract:

Gan-hua no.2 is a Indica hybrid combination emasculated by chem-ical.The aspects of yield vigor were closely related to larger photosyn-thetic area,longer growth period and leaf area duration.Data foryears showed that heterosis in yield were mainly due to the increase intotal number of spikelets,ripened grains number per unit area andnumber of spikelets per panicle.It was found that the vigor of yield was also closely related to se-eding and transplanting time.Earlier seeding and transplanting showedhighest...