Study on the Differences of Original Seed Performance of Two Potato Cultivars Propagated in Different Method
The comparsion was made for 2 a between production method of seed tuber, production in open field and greenhouse, in two potato varities, late maturing variety Longshu No.3, and early maturing variety LK99. The results shown that whether production in open field or in greenhouse there were no obvious differences between production methods in the growth vigour and the seedling uniformity, the period of duration as well as the height of plant. The incidence rate of mosaic virus of Longshu No.3 virus free potato seed breeding in open field condition was higher by the percentages from 3.57 5.01 than that in greenhouse, however the production conditions had no effect on the potato leafroll virus. There were no mosaic virus and leaf roll virus in LK99. In disease prevalent year, the incidence rates of late blight disease in open field was higher by 5.0 percentages than that in greenhouse in two cultivars. No difference was observed between open field and greenhouse in the number of tubers per plant, plant vigour in first degree seed tuber. The yield of Longshu No.3 in greenhouse was 9.3% higher than that in open field, 4.5% higher in LK99, but there was no difference in income. The yield of second degree seed tuber grown in greenhouse was higer than that in open field.