Gölgen Bahar Öztekin

Impact of grafting and rootstock on nutrient-to-water uptake ratios during the first month after planting of hydroponically grown tomato

ABSTRACT Tomato plants (cv. Primadonna F1), non-grafted, self-grafted, or grafted onto the commercial rootstocks ‘He-man’ and ‘Maxifort’, were grown in recirculating nutrient solution. The uptake concentrations (UCs), i.e. mean nutrient-to-water uptake ratios of N, P, K, Ca, Mg, Fe, Mn, Zn, Cu, and B, were estimated based either on depletion from the nutrient solution or on accumulation in the plant biomass. Grafting onto both commercial rootstocks increased the total plant biomass. Hetero-grafting also increased the leaf N, Ca, and Cu concentrations but decreased those of Mg and Fe in comparison with self- and non-grafted plants. The mean UCs of N, Ca, and Cu were higher in plants grafted onto both commercial rootstocks in comparison with self- and non-grafted plants. However, hetero-grafting also raised the UCs of P, Fe, Mn, and B, because of an increased deposition of these nutrients to the roots in comparison with self-rooted plants. The method used to estimate the UCs, i.e. nutrient removal from the recirculating nutrient solution vs. nutrient recovery from plant biomass per volume unit of transpired water, resulted in similar values for N, Ca, Zn, and Cu, but had a significant impact on those of P, K, Mg, Fe, Mn, and B.

Domates Anaçlarının Farklı Dikim Tarihlerinde Bitki Gelişimi, Sıcaklık Toplamı İsteği, Verim ve Kaliteye Etkileri

he aim of this research was to determine the effects of rootstocks on plant growth, yield, fruit quality and temperature sum requirements (TS) in different planting dates. This research was carried out in autumn and spring season as split plots experimental design with 3 replicates. Main plot was planting dates which were (1) 1 September, (2) 14 September and (3) 3 October 2005 in autumn and (1) 3 March, (2) 17 March ve (3) 31 March 2006 in spring season. Sub-plots were different rootstocks namely (1) Beaufort, (2) Heman, (3) Vigomax and (4) control (non grafted Durinta plants). In the research only the main effects of treatments on stem length was found significantly different in autumn and it was higher in the first planting date and in the plants grafted on Heman. Leaf area also increased with the rootstocks although the response changed accordingly. In both growing seasons among the rootstocks, TS was found lower in Beaufort. It was higher in the first planting date and decreased at the further planting dates. In terms of yield parameters, yield was higher in the first planting date in autumn and in the first two dates in spring. Also the positive effect of rootstocks on yield was determined.