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Influence of Plug Seedlings Grown at Different Elevations and Cultivation Density on the Growth and Yield of Two Tomato Cultivars in Fall Crop Season
fall crop season
Tomato cultivars Known- You 301 and Red Crown were used in this study. Tomato seedling were grown in high and low elevations at ching- jing farm, Nantou and at Shang-sheng nursery, Chiayi, respectively. The seedlings, then, were transplanted twice into the plots at Tainan District Agricultural Improvement Station in September and October, 1998 with three different densities to evaluate seedling-growing condition and plant density on the growth and yield of tomato. Results of the cv. Known- You 301 indicated that the stem diameter of the seedling grown at high elevations is larger but shorter than that grown at low elevations. No significantly difference was observed in the node of flower initiation among the seedlings from high or low elevations and planted in September, while the seedlings planted in October, high elevations plants were found with 6.3 nodes lowest for flower initiation. On the cv. Red Crown, Seedling quality was found the same as cv. Known-You 301 ignoring the seedling grown elevations. Seedling grown at high elevations and transplanted in September and October were found with 1.2 and 3.6 nodes, respectively, lower of flower initiations than those cultivated at low elevations. On the cv. Known-You301. Data accumulation of the harvestings in 12 weeks. Total fruit numbers, average fruit weight, and total yield for the plants planted in October were higher than those planted in September. Plants from high elevations seedlings were higher yield and more fruits in the first 2 and 4 weeks of harvestings. The yield per 3m2 of plants from high elevations seedlings was 0.8 ㎏ in the first 2 weeks and accumulated to 5.1㎏ in the 4th weeks, while the of yield plants form low elevations seedling was from 0.2㎏ to 2.9㎏. Since then elevations of seedling raising did not significantly affect the yield. Among the plant densities tested, one plant at a planting hill and with 25㎝ between plants had the highest fruit number, however, no significantly difference was observed in fruit size and average fruit weight. The plot with one plant/25㎝/hill between plants produced 2.8㎏ more than that with on plant/50㎝/hill between plants planted in September or October. “Red Crown” tomato, plants planted in October were with higher yield, more fruits and larger average fruit weight than those planted in September in the first（2wks）, 2nd（4wks）and 3rd（6wks）harvestings, total yield and fruit number from the seedlings grown at high elevations were higher than that from the low elevations seedling. Average fruit weight was no significantly difference between the seedling-raising elevations in the first and 2nd harvestings. After 4 weeks or after the 2nd harvesting, average fruit weight from the low elevations seedlings was larger than that from the high elevations seedlings. The yield of plants from high elevations seedling in each experimental units was 0.3㎏ of fruit in the first 2 weeks and accumulated to 9.7㎏ in the 6th weeks, but the yield of plants from low elevations seedlings was from 0 to 7.6㎏. No significantly difference was observed in yield after 6 weeks. Among the three densities, yield of the treatment with one plant / hill was the highest than the other two. The plot with one plant/25㎝/hill between plants produced 4.1㎏ more than that with on plant/50㎝/hill between plants in September or October.
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