ISHS Acta Horticulturae 205: Symposium on the Development of New Floricultural Crops, XXII IHC
FOLIAR TISSUE ANALYSIS STANDARDS FOR NITROGEN, PHOSPHORUS AND POTASSIUM IN CALADIUM xHORTULANUM BIRDSEY |
| Author: | Brent K. Harbaugh |
| Abstract:
Foliar levels of N, P and K were correlated to leaf and tuber weights of caladiums grown in sand and supplied with essential macro and micro elements and a wide range of available N, P or K. Optimal leaf or tuber weights were associated with foliar levels of 4.3 or 3.6% N, 0.55 or 0.52% P and 3.2 or 3.2% K, respectively. Regression analyses indicated sufficiency ranges for foliar nutrient levels (tuber or leaf fresh weights ± 10% of the optimum) were 3.6–4.9% N if plants were grown for foliage display (potted plants), and 3.1–4.1% N if plants were grown for tuber production. Response curves were similar for leaf and tuber weights for P and K, with sufficiency ranges of 0.37–0.68% P and 2.3–4.1% K. Visible deficiency symptoms were detected when foliar nutrient levels were less than 2.8% N, 0.18% P or 1.4% K. Visible toxicity symptoms were observed when foliar nutrient levels were greater than 4.8% N, 0.7% P, and 4.5% K. | |
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