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Studies of Tillering in Welsh Onion(Allium fistulosum L.)
Through the microscopic obseration , the tillering type of welsh onion belongs to intravaginal. Field and greenhouse results in planting 1, 2 and 3 plant per hill indicated that total yield increased as planting density increased. The yield had positive correation to tiller number, plant height, leaf number and length of sheath, but negative correation with plant diameter. True seedlings had higher yield than vegetative seedling in cv. ''Lan Yang No3.'' Which was due to higher tiller number and leaf number.
Results from planting depths of 5, 10 and 15cm showed planting depth of 10cm has the highest yield. Deeper planting could reduce the number of tillers but not reached in significant level. Study on the correlation coefficience of yield in different planting depth showed total yield is positive correlation with number of tillers, plant height, leaf number and length of sheath, except plant diameter. It showed that increase is number of tillers, plant height, leaf number and length of sheath could increase in total yield.
The viruse-free health seedling for tissue culture and true seed of 3welsh onion had 11.1-13.8% of infected plants after 3 months of growing in open field. The healthy plants had singnificatly better yield than the infected plants.
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