Changes in Growth and Yield of Strawberry (cv. Maehyang and Seolhyang) in Response to Defoliation during Nursery Period
2011
Kim, D.Y., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Kim, T.I., Chungcheongnam-do Agricultural Research and Extension Services, Yesan, Republic of Korea | Kim, W.S., Chungcheongnam-do Agricultural Research and Extension Services, Yesan, Republic of Korea | Kang, Y.I., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Yun, H.K., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea | Choi, J.M., Chungnam National University, Daejeon, Republic of Korea | Yoon, M.K., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea
This study was conducted to examine the effects of defoliation treatment on the growth and yield of strawberry (Fragaria × ananassa cv. Maehyang and Seolhyang) during nursery period. Leaves of strawberry plantlet had been removed except two, three and four fully expanded leaves until planting date. As the intensity of defoliation was strong, the petiole length was reduced and overgrowth of strawberry plantlet was suppressed. Outer diameter of crown in defoliation treatments significantly decreased but inner diameter of crown was not significant. Number of primary roots of the 3 leaves or 4 leaves defoliation treatment generally tended to increase, but there was not significantly different among treatments. Fresh weight and leaf area in the defoliation treatments significantly decreased and the root weight were higher in partial 3 leaves or 4 leaves defoliation treatment but was not significantly different among treatments. Because T/R ratio decreased significantly as growth inhibition of above-ground part compared to underground part, it is considered easy to take rooting after plantlet plating. As the intensity of defoliation was strong, chlorophyll contents tended to decrease significantly. Reduction of the endogenous nitrogen by defoliation effectively led to promote floral differentiation at low temperature and short day condition. This promoted timing of budding and flowering and also induced uniform flowering after plantlet planting. Marketable fruit yield of 3 leaves defoliation treatment tended to be higher than the control.
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