Articles
“STUDY OF THE EFFECT OF SOME MINERAL DEFICIENCIES ON GREENHOUSE CARNATIONS (Dianthus caryophyllus) IN HYDROPONIC CULTURE”
Article number
307_25
Pages
203 – 212
Language
Abstract
The effect of nutrient deficiencies of N, P, K, S, Ca, Mg and B on greenhouse carnations cv. "Tanga" was studied in hydroponic culture.
N deficiency symptoms consist in a generalized chlorosis of plants, strong reduction in growth and shortening of the internodes.
K deficiency appeared with irregular necrotic spots on the leaves, as well as brittle stems and sugar exudations on the stems.
Slight symptoms were observed in P deficiency (darkening foliage) and in Ca deficiency (weakening and slight clhorosis of young shoots). Flower production was reduced 40% in N deficiency.
The highest calix splitting was observed in minus-K treatment.
Dry matter production was reduced 30% in minus-N treatment and consequently nutrient extraction was low.
Average nutrient extraction per plant for all treatments at 59th week after planting was 2.2 g N, 0.5 g P, 3.2 g K, 0.3 g S, 1.2 g Ca, 0.4 g Mg, 0.2 g Na, 21 mg Fe, 16 mg Mn, 7 mg Cu, 7 mg B and 31 mg Zn.
Foliar analysis showed decreasing levels of N, P, K, Ca and Mg under the corresponding deficiencies.
The first symptoms of N deficiency appeared when foliar N level was below 2% in dry matter.
Symptoms of K deficiency appeared when foliar K was below 1% in dry matter.
N deficiency symptoms consist in a generalized chlorosis of plants, strong reduction in growth and shortening of the internodes.
K deficiency appeared with irregular necrotic spots on the leaves, as well as brittle stems and sugar exudations on the stems.
Slight symptoms were observed in P deficiency (darkening foliage) and in Ca deficiency (weakening and slight clhorosis of young shoots). Flower production was reduced 40% in N deficiency.
The highest calix splitting was observed in minus-K treatment.
Dry matter production was reduced 30% in minus-N treatment and consequently nutrient extraction was low.
Average nutrient extraction per plant for all treatments at 59th week after planting was 2.2 g N, 0.5 g P, 3.2 g K, 0.3 g S, 1.2 g Ca, 0.4 g Mg, 0.2 g Na, 21 mg Fe, 16 mg Mn, 7 mg Cu, 7 mg B and 31 mg Zn.
Foliar analysis showed decreasing levels of N, P, K, Ca and Mg under the corresponding deficiencies.
The first symptoms of N deficiency appeared when foliar N level was below 2% in dry matter.
Symptoms of K deficiency appeared when foliar K was below 1% in dry matter.
Publication
Authors
L.A.T. Medina
Keywords
Carnation, Mineral Nutrition, Deficiency Symptoms, Foliar Analysis
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