2023 年 46 巻 p. 27-44
Degradation of potatoes is responsible for advancing generation, and yield loss vary due to the use of the seeds from different generations. Therefore, experiments were conducted at the research field and post graduate laboratory of Plant Pathology Department, Hajee Mohammad Danesh Science and Technology University, Dinajpur, during three successive seasons from 2014 to 2017 to assess the field performance of different generation of seed potatoes. Four different categories of seed potatoes, namely Minituber, Breeder seed, Foundation seed and Certified seed, were used to advance generations in the experiment. The results showed that Minituber produced an acceptable healthy tuber yield in 1st and 2nd year multication with zero plants infected by Potato Virus Y (PVY). In contrast, the other seed categories produced the maximum healthy tuber yield in 1st year multination, which then declined in 2nd and 3rd year multination. The incidence of diseases such as PVY, potato leaf roll virus (PLRV), and Rhizoctonia Canker (Common Scab) gradually increased with the generation of seed potatoes in the case of Breeder, Foundation and Certified seed. Tuber yield reduced by 4.58 % and 5.64 % in 2nd and 3rd year multination for Foundation seed and by 9.11% and 12.63% for Certified seed, respectively. Breeder seeds increased tuber yield by 0.07% in 2nd year multination but decreased by 5.23% in 3rd year multination. Minituber increased tuber yield by 12% in 2nd year and 3.95% both in 3rd year multination. Therefore, to achieve a better seed potato yield, minitubers should be multiplied in the field for more than two consequent year, which other seed categories should not be expanded for more than one year. In terms of the benefit cost-ratio (BCR), the highest gross margin (Tk. 1243067 / ha) and BCR (5.29) were observed in advancing generation of minituber.
