Source-Sink Partitioning of Mineral Nutrients and Photo-assimilates in Tomato Plants Grown under Suboptimal Nutrition

초록

A huge number of greenhouse soils in Korea have accumulated mineral elements which induce manynutritional and pathological problems. The present study was performed to the effects of the reducedfertilization on plant growth, and uptake and partitioning of minerals (N, P, K) and soluble carbohydratesusing highly minerals-accumulated farmer’s greenhouse soil. On the basis of the recommended application fortomato 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 significantbetween 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 carbohydratescaused an accumulation of extra-carbohydrates in leaves, stems and fruits in the reduced application. Thereduced fertilization induced the capture of N, P and K in leaves and of soluble carbohydrates in stemscompared to the conventional application. In this study, we suggest that it is possible to delay the firstfertigation time in minerals-accumulated soils without an adverse impact on crop growth, but it is necessary toregularly monitor mineral status in soil to ensure a balanced uptake, synthesis and partitioning of minerals andcarbohydrates.

키워드