Korean Journal of Soil Science and Fertilizer (한국토양비료학회지)

Korean Society of Soil Science and Fertilizer (한국토양비료학회)
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Source-Sink Partitioning of Mineral Nutrients and Photo-assimilates in Tomato Plants Grown under Suboptimal Nutrition

  • Sung, Jwakyung (Division of Soil and Fertilizer Management, NAAS, RDA) ;
  • Lee, Suyeon (Division of Soil and Fertilizer Management, NAAS, RDA) ;
  • Lee, Yejin (Division of Soil and Fertilizer Management, NAAS, RDA) ;
  • Yun, Hongbae (Division of Soil and Fertilizer Management, NAAS, RDA) ;
  • Ha, Sangkeun (Division of Soil and Fertilizer Management, NAAS, RDA) ;
  • Ok, Yongsik (Department of Biological Environment, Kangwon National University)
  • Received : 2013.11.05
  • Accepted : 2013.12.11
  • Published : 2013.12.31
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Abstract

A huge number of greenhouse soils in Korea have accumulated mineral elements which induce many nutritional and pathological problems. The present study was performed to the effects of the reduced fertilization on plant growth, and uptake and partitioning of minerals (N, P, K) and soluble carbohydrates using highly minerals-accumulated farmer's greenhouse soil. On the basis of the recommended application for tomato crop, the application rates of N, P and K were 110(50%)-5.2(5%)-41.5(35%)kg $ha^{-1}$, respectively, using Hoagland's nutrient solution. Tomato growth rates during the whole experiment were not significant between treatments, but it was found that a decrease in daily growth represented after 60 days of treatment (DAT). The reduced application led to a drastic decrease in the concentration of N, P and K in fruits, and, thus, this resulted in lower uptake after 40 DAT. The lower phloem export and utilization of soluble carbohydrates caused an accumulation of extra-carbohydrates in leaves, stems and fruits in the reduced application. The reduced fertilization induced the capture of N, P and K in leaves and of soluble carbohydrates in stems compared to the conventional application. In this study, we suggest that it is possible to delay the first fertigation time in minerals-accumulated soils without an adverse impact on crop growth, but it is necessary to regularly monitor mineral status in soil to ensure a balanced uptake, synthesis and partitioning of minerals and carbohydrates.

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References

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