Research on the effect of different irrigation treatments on some of growth parameters, rubber content in different cultivars of Guayule
2007
Baher Nik, Zahra | Mirza, Mehdi | Babakhanlo, Parviz | Lebaschi, Mohamad Hossein | Abbas Zadeh, Bohlole | Ghaffari, Mahmood
Water stress influences yield and Secondry metabolites in plants through declining the balance of the Carbon element. In this experiment the effects of different irrigation treatments on some of the growth parameters, yield of rubber and resin in different cultivars of guayule was investigated. This experiment was undertaken in analytical split plot design with three replications and four irrigation treatments, consisting of: FC (full field capacity)two moderate treatments (3/4 and 1/2 of FC) and sever stress (1/4 of FC). The results showed that the average of plant height, diameter, canopy, fresh and dry weight, reduced but rubber and resin percentages increased with declining of irrigation. The maximum stem height and diameter were observed in FC treatment respectively in UC/103 (56.33 cm) and CAL6 (2.76 cm) but the minimum stem height and diameter were observed in HS treatment in CAL6(35 cm) and UC/103 (1.6 cm). The maximum and minimum canopies were observed in FC treatment in CAL7 and HS treatment in UC/103 respectively. The maximum stem fresh and dry mass accumulation was observed in FC treatment in UC/103 with 810 and 384 g. In HS treatment the minimum stem fresh weight was shown in UC/103 and CAL7 respectively with 172.5 and 131.7 g while the minimum stem dry mass observed in UC/103 (61.03 g). Rubber and resin yield increased from field capacity to HS treatment, respectively from 2.2 to 5.56% and 4.83 to 9.73 %.
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