Characterization of Symptom and Determination of Tissue Critical Concentration for Diagnostic Criteria in 'Maehyang' Strawberry as Influenced by Potassium Concentration in the Fertigation Solution
2009
Choi, J.M., Chungnam National University, Daejeon, Republic of Korea | Jeong, S.K., Chungcheongnam-do Agricultural Research and Extension Services, Yesan, Republic of Korea | Yoon, M.K., National Institute of Horticultural and Herbal Science, RDA, Suwon, Republic of Korea
This study was carried out to investigate the effect of potassium concentration in fertilizer solution on growth and nutrient uptake by 'Maehyang' strawberry (Fragaria × ananassa Duch.). Tissue analysis based on dry weight and petiole sap was also conducted to determine the threshold concentrations in plants when potassium deficiency developed. Plant growths were not affected seriously in K deficient plants. Purple areas developed on the veins near the petiole of mature leaves. The purple areas rapidly became brown. Marginal chlorosis, marginal scorch and petiole necrosis occurred in K deficient plants. The dry weight and tissue K contents of above ground plant tissue at 120 days after transplanting increased as K concentration in fertilizer solution was elevated within concentration range from 0 to 6.0 mM and 0 to 8 mM, respectively. The trends in dry weight and tissue K contents were quadratic. The changes of fresh weight and K concentrations in petiole sap responded to elevated K concentrations in fertilizer solutions were quadratic responses with the equations of y=20.06+5.714x-0.4493x² (R²=0.6403***) and y=66.52+229.97x-18.892x² (R²=0.8413***), respectively. When the concentration of K at which growth of a plant is retarded by 10% is regarded as threshold concentration level, the potassium contents based on dry weight or petiole sap should be in the range between 1.9 to 2.8% and 480 to 720 mgㆍkg-¹, respectively.
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