"STUDY OF THE EFFECT OF SOME MINERAL DEFICIENCIES ON GREENHOUSE CARNATIONS (Dianthus caryophyllus) IN HYDROPONIC CULTURE"

L.A.T. Medina
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.
Medina, L.A.T. (1992). "STUDY OF THE EFFECT OF SOME MINERAL DEFICIENCIES ON GREENHOUSE CARNATIONS (Dianthus caryophyllus) IN HYDROPONIC CULTURE". Acta Hortic. 307, 203-212
DOI: 10.17660/ActaHortic.1992.307.25
https://doi.org/10.17660/ActaHortic.1992.307.25
Carnation, Mineral Nutrition, Deficiency Symptoms, Foliar Analysis

Acta Horticulturae