Physiology of mineral nutrition in pepper 1. effect of nitrogen sulfur phosphorus potassium calcium and magnesium ion ratios on dry matter accumulation during individual development phases and on fruit yield
Pandev, S.; K''drev, T.
Fiziologiya na Rasteniyata 5(2): 88-96
ISSN/ISBN: 0324-0290 Accession: 006119575
Plants of 2 pepper cultivars, 'Zlaten Medal' and 'Kurtovska Kapija', were grown in gravel cultures after the Homes (1955) method of systematic variants from seeding to the end of vegetation. Nutrient solution of a total 38 meq/l concentration and constant anion (A): cation (C) ratio = 1:11 was used. Based on the accumulated quantity of dry matter at the beginning of budding, the optimal macroelement ion ratios in the nutrient solution during the period of growing pepper transplants appear to be: for 'Zlaten Medal' N:S:P = 37.1:32.1:30.8% of the anion sum total and K:Ca:Mg = 30.5:35.7:33.8% of the cation sum total, while for 'Kurtovska Kapija' they are, respectively, 45.6:28.4:26.0% of the anion sum total and 29.7:35.1:35.2% of the cation sum total. During the fruit bearing period the optimal ratios estimated on the basis of fruit yield are as follows: for 'Zlaten Medal', N:S:P = 61.7:21.2:17.1% of the anion sum total and K:Ca:Mg = 36.1.:31.5:32.4% of the cation sum total while for 'Kurtovska Kapija' they are, respectively, 59.1:22.1:1.88% of the anion sum total and 37.8:31.6:30.6% of the cation sum total. Dry matter accumulation post seeding increases steadily and reaches its maximum at the end of vegetation. Until the beginning of anthesis it has a slow rate but after that it is sharply accelerated. Most intensive dry matter accumulation in the plants of both cultivars is observed during the fruit bearing period.