Effect of Soil Temperature, Seedtime, and Fertilization Rate on the Secondary Growth in the Cultivation of the Big Bulbils of Namdo Garlic (Allium sativum L.)
2009
Choi, H.S., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Yang, E.Y., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Chae, W.B., Namhae Sub-Station, National Institute of Horticultural and Herbal Science, RDA, Namhae, Republic of Korea | Kwack, Y.B., Namhae Sub-Station, National Institute of Horticultural and Herbal Science, RDA, Namhae, Republic of Korea | Kim, H.L., Namhae Sub-Station, National Institute of Horticultural and Herbal Science, RDA, Namhae, Republic of Korea
The secondary growth of garlic depreciates the quality of a bulb and, in the worse cases, makes it difficult to be used as a seed bulb due to many insertions of small cloves in the seed bulb. Therefore, the effect of soil temperature, seedtime, and fertilization rate on the secondary growth of the big bulbils of Namdo garlic has been examined. When we analyzed into the growth characteristics of big bulbils of Namdo garlic under different fertilizer application levels (50% increased fertilization, experimental fertilization and 50% decreased fertilization), the plant height, numbers of leaf, sheathe diameter, leaf length, and leaf width were the best in 50% increase of the test rate of fertilizer. The occurrence rates of secondary growth were 34.2% in 50% decrease of the test rate of fertilizer, 44.3% in the test rate, and 54.1% in 50% increase of the test rate of fertilizer. In other words, the occurrence rate of secondary growth increased by increasing the fertilization rate. While the average harvested bulb weight were 34.1g in 50% decrease of the test rate of fertilizer, 35.1g in the test rate of fertilizer, and 33.9g in 50% increase of the test rate of fertilizer, there were no changes in the number of cloves under different fertilization rates. As the correlation diagram between the soil temperature and occurrence of the secondary growth showed very high relation with 0.892~0.997, the secondary growth in cultivation of Namdo garlic big bulbils had considerably close correlation with the soil temperature. As the earlier the seedtime was, the growth of the above-groundparts including the plant height, numbers of leaf, and sheath diameter were the better. The averages of bulb weight were 36g in the mid September sowed seed bulb, 29.6g in the late September sowed seed bulb, and 27.9g in the early October sowed seed bulb. Overall, our results showed that the bulb size is dependent on the seedtime and the seedtime has no particular effects on the secondary growth.
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