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KMID : 0903620000410040339
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Journal of the Korean Society for Horticultural Science
2000 Volume.41 No. 4 p.339 ~ p.344
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Deficiency Symptom , Growth Characteristics , and Nutrient Uptake of ´ Nyoho ´ Strawberry as Affected by Controlled Nitrogen Concentrations in Fertilizer Solution
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Abstract
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The objectives of this research were to induce nitrogen defiency symptoms and to determine critical concentration of dry matter, plant sap and soil solution when ´Nyoho´ strawberry revealed nitrogen deficiency symptom. To achieve these, Hoagland nutrient solution was modified to 5 different nitrogen concentrations, then tissue and soil analysis were conducted at 170 days after transplanting. When strawberry was grown with an inadquate N supply, the growth rate is reduced and yellowing of the leaves were observed. The loss of green color occured first on the more mature leaves and last on the younger leaves. The treatment with 10 mM nitrogen had highest dry weight (9.4 g/plant) and 0.95% of tissue N content based on dry matter. Those of 15 mM and 20 mM had 7.6 and 5.9 g/plant of dry weight and 0.97 and 1.05% of tissue N content, respectively. Increased concentration of nitrogen fertilization until 15 mM resulted in increased fresh weight. The treatment with 10 and 15 mM had 181 and 228 ㎎·㎏^(-1) of NO₃-N in plant sap and 28.8 and 32.7 g/plant of fresh weight, respectively. The ammoniacal plus nitrate concentrations of soil solution in 15 mM treatment which had highest fresh weight was 107.7 ㎎·L^(-1) and that in 10 mM treatment which had highest dry weight was 82 ㎎·L^(-1). This indicated that nitrogen concentration in soil solution should be remained in the range from 80 to 110 ㎎·L^(-1) to achieve highest crop growth.
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