Horticulture, Environment, and Biotechnology : HEB

Korean Society of Horticultural Science (한국원예학회)
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Performance of Seedling Grafts of Tomato as Influenced by Root Substrate Formulations, Fertigation Leaching Fractions, and N Concentrations in Fertilizer Solution

  • Choi, Jong Myung (Department of Horticulture, Chungnam National University) ;
  • Lee, Chiwon W. (Department of Plant Sciences, North Dakota State University) ;
  • Park, Jong Seok (Department of Horticulture, Chungnam National University)
  • Received : 2014.04.01
  • Accepted : 2014.11.18
  • Published : 2015.02.28
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Abstract

Influence of root substrate formulations, leaching fractions (LF) of fertigation during seedling growth before grafting and fertilizer N concentrations after grafting on growth of tomato grafted seedlings and changes in root substrate chemical properties were investigated. Sphagnum peatmoss + perlite (7:3, v/v, PP) and coir + perlite (7:3, CP) containing pre-plant fertilizers were used as substrates. LF (volume leached/applied) was set as 0, 0.25, 0.50, 0.75 and 0.9 during seedling cultivation. Seedlings of rootstock (J3B Strong) and scion (Sunmyung) were grown in 50- and 105-cell trays, respectively. Plants were fed with 50, 100, or $200mg{\cdot}L^{-1}N$ using 14-0-14 and 20-10-20 commercial fertilizers alternatingly for seedling stages 2, 3, and 4, respectively. Grafted tomato seedlings planted in 50-cell trays containing PP or CP were callused and rooted inside a humid greenhouse plastic tunnel for 7 days. When grafted tomato seedlings were rooted after acclimation under lower humidity condition, N fertilizers with 4 different concentrations (0, 50, 100, $200mg{\cdot}L^{-1}$) were applied. During 31 days of culture, highest fresh weight of rootstocks was obtained with 0.75x LF in CP, while PP showing no influence on seedling growth by LF. Electrical conductance (EC) of CP with 0.75x LF was $2.88dS{\cdot}m^{-1}$. Growth of scion seedlings was largest with 0.25x LF in PP, and EC of this treatment was $0.855dS{\cdot}m^{-1}$. For 13 days post-grafting, plant growth was better as LF increased for both substrates. When seedlings were grown with 0.90x LF, EC for PP and CP was 0.833 and $2.923dS{\cdot}m^{-1}$, respectively. Fresh weight of grafted plants grown for 31 days after grafting was the highest with $50mg{\cdot}L^{-1}N$ for PP and $0mg{\cdot}L^{-1}N$ for CP. Substrate EC in these treatments were 0.66 and $1.42dS{\cdot}m^{-1}$, respectively. This study suggests that LF and fertilizer N concentration must be optimized according to substrate formulations for growing high-quality grafted seedlings.

Keywords

Acknowledgement

Supported by : Agriculture and Forestry, Ministry for Food, Agriculture, Forestry and Fisheries

References

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