ISHS Acta Horticulturae 294: II Symposium on Horticultural Substrates and their Analysis, XXIII IHC
EFFECT OF INCREASING NUTRIENT SOLUTIONS ON GROWTH, BIOMASS PARTITIONING AND NUTRIENT UPTAKE OF CONTAINER-GROWN PEACH PLANTS. |
| Authors: | M. Tattini, P. Bertoni, R. Tafani |
| Abstract:
Micropropagated peach (Prunus persica L., cv. Armking) plants were grown for 120 days in pot with a peat/sand substrate (50/50 v/v) and supplied with nutrient solutions of increasing ionic strength (0 – 1.5 – 3.0 – 4.5 – 6.0 meq/pot/day). After 40, 80 and 120 days, fifteen plants for each treatment were harvested for growth and nutrient uptake measures. Plant dry weight and linear development showed a positive relationship with the nutrient concentration; on the contrary both root/shoot and thin/thick root ratios decreased by increasing nutrient supply. The effect of different fertilizing treatments was limited to the first 40 days of culture, all the nutrient supplies showing the same "relative growth rate" in the last 80 days of growth. On the whole "macro-nutrient uptake rate" showed a positive linear relationship with RGR during the first culture period; on the contrary nitrogen, phosphorus and potassium uptake did not correlate with biomass production later, during the growing season. Nutritional status of the peach plants was substantially modified by the tested nutrient solutions; to an increased nutrient supply, enhanced N/P, K/Ca and K/Mg ratios corresponded. | |
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