Adventitious rooting of mango (Mangifera indica L.) cuttings after pretreatment of stock plants. II. N-level and NO3/NH4-ratio in the nutrition.
Schaesberg N. von, Lüdders P.
Author Affiliation: Institut für Nutzpflanzenforschung-Obstbau, Technische Universität Berlin, Albrecht-Thaer-Weg 3, 14195 Berlin, Germany.
Gartenbauwissenschaft 58 : 280-285
Abstract : A greenhouse trial was carried out to investigate the influence of N nutrition of stock plants of the mango rootstock cultivars Terpentine and 13-1 on rooting of cuttings. Terpentine cuttings consistently rooted earlier and to a higher percentage, forming more and larger roots than 13-1 cuttings. Terpentine cuttings were richer in stem and leaf carbohydrates, but lower in N. Rooting percentage was unaffected by N concentration or NO3:NH4 ratio in the nutrient solution received by the mother plants, though both rootstock cultivars showed reduced rooting percentage after 9 months, attributed to increased ontogenetic age of the stock plants and to seasonal influences. Cutting root number and length were increased by high combined N and ammonium levels. Rooting was positively correlated with glucose, fructose and starch concentrations in leaves and stems of cuttings, but appeared to be unaffected by N content and C:N ratio of the stems.