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http://dx.doi.org/10.7235/hort.2012.11106

Characterization of Toxicity Symptom and Determination of Tissue Threshold Levels of Boron for Diagnostic Criteria in Domestically Bred Strawberries  

Choi, Jong-Myung (Department of Horticulture, Chungnam National University)
Nam, Min-Ho (Department of Horticulture, Chungnam National University)
Kim, Dae-Young (Vegetable Research Division, National Institute of Horticultural & Herbal Science)
Publication Information
Horticultural Science & Technology / v.30, no.2, 2012 , pp. 144-151 More about this Journal
Abstract
Diagnosis of nutrient disorders in cultivating crops is based on the visual symptoms and results of soil and plant analysis. This study was carried out to investigate the influence of B concentrations in fertilizer solution on the growth of and nutrient uptake by domestically bred strawberries. Tissue analysis based on the dry weight were also conducted to determine the threshold levels in plants when toxicity developed in boron. The growth was seriously restricted in the three strawberry cultivars as the B concentrations in fertilizer solution were elevated. The fresh and dry weights were heavier and crown diameters were thicker in the 0.25 mM boron treatment than the other treatments tested. The toxicity symptoms of boron appeared on the older leaves of three strawberry cultivars while interveinal chlorosis symptoms appeared on the young leaves of 'Keumhyang' and 'Seolhyang' strawberries. The toxicity symptoms in lower leaves were developed when B concentrations in fertilizer solution were higher than 2 mM in 'Keumhyang' and 0.5 mM in 'Maehyang' and 'Seolhyang' strawberries. The elevated boron concentrations in fertilizer solution did not influence the tissue K, Ca, and Mg contents, but influenced the phosphorus contents with decreasing tendency. The tissue Fe and Zn contents decreased and increased, respectively, as the B concentrations in fertilizer solution were elevated. When the concentration of boron at which the growth of a plant is retarded by 10% is regarded as a upper threshold level, the boron contents based on dry weight of above ground plant tissue should be lower than 25.1, 44.2, and 62.5 $mg{\cdot}kg^{-1}$ in 'Keumhyang', 'Maehyang', and 'Seolhyang' strawberries, respectively.
Keywords
growth; nutrient disorder; plant nutrition; visual symptom;
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