ISHS Acta Horticulturae 548: International Symposium on Growing Media and Hydroponics
EFFECTS OF POTASSIUM AND CALCIUM CONCENTRATION IN NUTRIENT SOLUTION ON THE GROWTH AND MINERAL UPTAKE BY POTATOES |
| Authors: | C.D. Chil, S.Y. Kim, J.C. Jeong, K.Y. Shin, Y.B. Lee |
| Abstract:
The influence of K and Ca concentrations (0, 4, 16 meq/liter) in nutrient solution on the growth and composition of potato plants (Solanum tuberosum L.) was investigated. Plants which received 0 or 16 meq/liter of K or Ca caused a significant reduction in stem height and node number and abnormally thick leaves. Particularly, plants which received no Ca supply developed definite symptoms of deficiency within 5 days after treatment. Leaflet margins of the youngest leaves turned yellow white and then necrotic. In severe deficiency, stem tips and lateral shoots ceased to grow, wilted and died, and roots were stunted. On the other hand, plants which received no K supply had dark green and glossy foliage and shortened internodes. Tissue tests indicated that accumulation of total-N by upper leaves was progressively increased in solution concentration of 0 meq/liter K. Increasing K or Ca concentration in solution from 4 to 16 meq/liter had antagonistic effect on the accumulation of total-N and P in upper leaves. Each nutrients concentration in upper leaves necessary to induce deficiency symptoms appeared to 1.1-2.2% K and 0.1-0.3% Ca. | |
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