Reza Fifaei; Reza Fotouhi Ghazvini; Behrooz Golein; Yusef Hamidoghli
Abstract
Citrus often were encountered with periodic droughts. For this reason, drought effect on six-month-old seedlings of Poncirus (PT) (Poncirus trifoliata Raf.),Troyer citrange (TC) (Citrus sinensis Osbec. × Poncirus trifoliata Raf.),Citrumello (CR) (Citrus paradisi M. × Citrus sinensis Osbec.),Sour ...
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Citrus often were encountered with periodic droughts. For this reason, drought effect on six-month-old seedlings of Poncirus (PT) (Poncirus trifoliata Raf.),Troyer citrange (TC) (Citrus sinensis Osbec. × Poncirus trifoliata Raf.),Citrumello (CR) (Citrus paradisi M. × Citrus sinensis Osbec.),Sour orange (SO) (Citrus aurantium L.),andCleopatra mandarin (CM) (Citrus reshni L.) were tested on 2014 in Ramsar Citrus Research Institute. This research was conducted as factorial experiment based on completely randomized design with three replications. The factors included commercial Citrus rootstocks and two level of irrigation. The results showed that maximum quantities of proline, total soluble sugars, malondialdehyde and carotenoid and minimum quantities of total, b and a chlorophyll were observed in drought stress. Maximum accumulation of proline (ordered 306.41 and 281.65 µmol/gdw) and total soluble sugars (ordered 233.79 and 137.9 mg/gdw) and minimum accumulation of malondialdehyde (ordered 179.21 and 204.1 µmol/gdw) were observed in SO and CM rootstocks under drought stress. Decreasing amount of total and chlorophyll a in CM and chl b in SO rootstock was more than other rootstocks and decreasing amount of total and b, a chlorophyll in CR was least. Furthermore, increasing amount of carotenoid in SO and CM was most and the least amounts in PT was observed. On the basis of the study, trifoliate rootstocks as Poncirus, Troyer citrange and Citrumello tolerate as much as drought.
Arezoo Dadrasnia; Akbar Forghani; Bijan Moradi; Reza Fifaei
Volume 11, Issue 2 , November 2009, , Pages 41-47
Abstract
Nitrogen foliar spray is one of the most important components in fertilizing programs for citrus in Iran, as it can reduce nitrate leaching. The goal of this research was to determine the most effective concentration of foliar urea application on “Thamson Navel’’ orange trees, for achieving ...
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Nitrogen foliar spray is one of the most important components in fertilizing programs for citrus in Iran, as it can reduce nitrate leaching. The goal of this research was to determine the most effective concentration of foliar urea application on “Thamson Navel’’ orange trees, for achieving the highest yield. Foliar sprays were carried out, in two stages with total concentrations of 0.4, 0.8 and 1.2%. The first stage applied in April with concentrations of (0.25, 0.5 and 0.75%) and second stage in the end of July with concentrations of (0.15, 0.35 and 0.45%). Results of statistical analysis showed that urea treatment at concentration of 1.2% had significant effect on increasing the mean fruit weight. Also significant increase in mean fruit diameter and total soluble solids to acidity ratio in urea treatment at 0.4% concentration were observed. The results indicated that, there is no significant effect on vitamin C and ratio of fruit length to fruit diameter in urea treatment at concentration of 1.2%. All spray treatments increased fruit set. Finally, urea treatment at concentration of 1.2% had the best effects on more of studied traits.