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Studies on the plug cell design for improving pan root and growth of tomato and cabbage seedling
|關鍵字:||Plug cell design|
Three tray types, inverse pyramid cell, rounded pyramid cell, and improved round cell, effect of plug type on root growth of tomato and cabbage seedling. Root circling was serious in rounded inverse pyramid cell which cell depths were not deep enough. There is also some root circles on the inverse pyramid cell seedlings. The improved round tray type with six crest lines has root-inducted function, and roots distribution were uniformed. Root area, root dry and fresh weight of tomato seedlings grown in improved round type plug had the largest growth, but inverse pyramid type showed the smallest. Plug type had no significant affect on growth of cabbage seedling. Although root area, root fresh and dry weight were highest on improved round type plug, all of them had not reached significant level. Effect of plug type on growth stage of tomato and cabbage seedling was different. The results indicated on growth of tomato seedlings that stem diameter, leaf area, and shoot dry weight of tomato seedlings were grown in improved round cell and were higher than those of in inverse pyramid cell. However, there were no significant different between rounded pyramid and improved round cell seedlings in above these characteristics. In cabbage seedling, significant differences were found on stem length, leaf number, and leaf area of cabbage seedling, but not on stem diameter, shoot fresh and dry weight. In inverse pyramid cell seedlings, the stem diameter was the thinnest, but the stem length was the longest and seemed to have over growth. Leaf number and leaf area were largest in improved round cell seedlings. Yield of tomato and cabbage seedlings were highest on improved round plug after they were transplanted and no significant results were found between rounded and inverse pyramid type plug.Changes cell design in inverse pyramid and rounded pyramid plug would improve roots growing in circles of tomato and cabbage seedling. Inverse pyramid cell was treated with a series of narrow vertical openings in the sidewall (T-A-4), root tips of seedling growing to the opening sites, and reaching on the edge of the cell sidewall puncture. So this treatment has root-inducted function. In addition, partial of root tips dried up, stopped growth and stimulated root branch. De-bottom cell treatment (T-O), owing to directly contact with the air, automatically stopped root tips growth as the root grew to the cell bottom. So root pruning effect can improve root growth not only avoided pan root but also promoted growth of branch root. Although rounded pyramid cell seedlings will more give pan root than inverse pyramid cell seedlings did, this deficit was improved after the plug cell structure was changed, especially in cell sidewall treated with a series of narrow vertical openings of the plug (R-A-3) to avoid the root circles. Meanwhile, the U form bottom (R-U) also reduced the possibility of root circling, but forming a U form browning root vestige at the plug cell bottom. The root tips number of 4-week-old tomato seedlings grown in inverse pyramid cell with T-A-4 treatment and de-bottom increased 218%, 210% respectively, than in control plug. The rounded pyramid cell with R-A-3 treatment increased 157%, than in control plug. At the same time, the root tips number of cabbage seedlings grown in all designed cell trays were also significantly more than that in control plug. At 5 to 7-week-old tomato and cabbage seedlings, the root area, root fresh and dry weight were significant higher than those in control plug. Thus, the root growth of tomato and cabbage seedlings grown in inverse pyramid cell tray with T-A-4 treatment was the highest. However, Rounded pyramid cell with R-A-3 treatment was the highest. On the other hand, plug cell structure treatment also increased the growth index of the tomato and cabbage seedlings. The inverse pyramid cell with T- A-4 treatment showed was the highest harvest index, and control was the lowest. Wereas, the rounded pyramid cell with R-A-3 showed the best harvest index and the seedling quality.Owing to root pruning and root induction affect during the seedling stage, root tip number of tomato and cabbage seedlings 10 days after transplanting were highest in de-bottom cell, the next highest in T-A-4 treatment and the lowest in control set in the inverse pyramid cell tray. The seedling growth of R-A-3 treatment after transplanting was higher than that of control set in the rounded pyramid cell tray. The initial flowering point of tomato was earlier two to five days than the control. Early stage of tomato yield was also increased significantly. The cabbage seedling grown in all designed cell trays had the highest head yield than control.
|Appears in Collections:||園藝學系|
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