Department of Horticultural Science, Chungnam National University1
This research was conducted to develop root media containing ground and aged pine bark (GAPB) and ground and raw pine bark (GRPB). After analysis of physico･chemical properties, the pine barks were blended with peat moss (PM) or coir dust (CD) in various ratios to formulate 12 root media. Then, two out of 12 root media were chosen based on the physical properties for further experiments. The pre-planting nutrient charge fertilizers (PNCF) were incorporated into two root media and chemical properties were analysed again. The total porosity (TP), container capacity (CC), and air-filled porosity (AFP) of GAPB were 78.7%. 39.4%, and 38.3%, respectively, while those of GRPB were 74.7%, 41.2%, and 33.4%, respectively. The percentage of easily available water (EAW, from CC to 4.90 kPa tension) and buffering water (BW, 4.91-9.81 kPa tension) in GAPB were 12.7% and 8.5%, respectively, which were a little lower than the 13.5% and 8.8% in GRPB. The pH and EC were not different significantly, but cation exchange capacity was different between the two pine barks (GAPB: pH 5.26, EC 0.61 dS･m-1, CEC 15.7 meq･100 g-1; GRPB: pH 5.19, EC 0.32 dS･m-1, CEC 9.32 meq･100 g-1). The concentrations of exchangeable cations in GAPB were Ca 0.32, K 0.05, Mg 0.27 and 0.12 cmol+･kg-1, whereas those in GRPB were Ca 0.28, K 0.08, Mg 0.25 and 0.09 cmol+･kg-1. The concentrations of PO4-P, NH4-N and NO3-N were 485.8, 0.62 and 0.91 mg･L-1 in GAPB and 578, 1.00 and 0.82 mg･L-1 in GRPB, respectively, when those were analyzed in the solution of the saturated paste. The TP, CC and AFP in the two selected media were 89.3 and 76.3, and 13.0% in PM+GAPB (8:2, v/v) and 88.2, 68.2 and 20.0% in CD+GRPB (8:2), respectively. The pHs and ECs were 3.8 and 0.24 dS･m-1 in PM+GAPB which were a little lower than 5.8 and 0.65 dS･m-1 in CD+GRPB. However, the pHs analysed before and after incorporation of PNCF in the two root media did not show large differences. This is because the solubility of dolomitic lime is very low, and the pHit is expected to rise gradually when crops are cultivated in the root media. The information obtained in this study should facilitate effective formulation of root media containing pine bark.
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