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Studies on Plug Cell Modification for the Improvement of Root Bounding and Growth of Cabbage(Brassica oleracea L. var. capitata L. ) Seedlings
Wen Shann Lee
|關鍵字:||Plug;盤根;Root bounding;Cabbage;甘藍;穴格構型||Project:||興大園藝, Volume 23, Issue 2, Page(s) 63-76.
Horticulture NCHU, Volume 23, Issue 2, Page(s) 63-76.
Modification of both inverse pyramid and cone shape plug cells had the effect of improving root bounding in cabbage seedlings. For Inverse pyramid cells, vertical narrow openings on each sidewall (T-A-4)had the effects of root pruning, so as to increase root branching. The side opening could also direct the root growth of the seedlings to the bottom of plug cells. More branch roots and no root bounding were observed on seedling in de-bottomed plug cells. The reason for this positive result was postulated to b4 air pruning effect of cell modification. Although more severe root bounding problem has been observed in cone shape than in inverse pyramid plug cells, modification of plug cell either by vertical opening (R-A-3) or by U-shape cutting at the bottom (R-U) could significantly improve the phenomenon of root bounding. Results indicated that, seedlings in inverse pyramid plug cells with R-A-3 and R-U treatments had 159% and 151% more root tips than controls, respectively; while seedlings in cone shape plug cells with R-A-3 treatment had 178% more root tips than control. The post effect of plug cell modification was also observed on seedlings after transplanting. As the root tip number counted at 10 days after transplanting was found being the highest on plants from de-bottomed cells, which was followed by T-A-4, and the control set was the lowest. It was believed that the increase in root tip number of seedlings from modified plug cells was mainly due to the air pruning effect. When compared to control, all of the modifications on plug cell had the effects of increased fresh weight per head and increased yields.
|Appears in Collections:||第23卷 第02期|
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