EFFECTS OF SEED TUBER SIZE ON GROWTH AND YIELD OF DIA HOANG 19 GROWING IN PHU THO

Abstract

The Dia hoang 19 variety has been selected and registered for circulation in Vietnam from 2020. The study aims to determine the appropriate tuber size to ensure good growth and high yield. Experiments on the effect of diameter, length of tuber on seed quality were arranged in a complete randomized block. It is evaluated through the criteria of cutting rate, survival rate, and growth ability, yield components, tuber yield. The results have determined that tubers for seeding with tuber diameter from 1.5 - 2 cm, tuber length > 10 cm give the best quality. It has germination rate of 93.6%, survival rate of cuttings 88.4%, number of tubers/plant 4.1 tubers, average weight of tubers 55.4 g and actual yield 25.7 tons/ha. This result helps to clarify the selection criteria for tubers and it is suggestive for the development of a basic set of standards for the seed tubers of Dia hoang 19 variety in actual production.