Effects of bunch thinning methods on date bunch fading disorder at pollination and kimri stages.
2009
Izadi, Mohammad | Davud Zadeh, A`tefeh | Daman Keshan, Bahareh | Ne`mati, Yad Ol-Lah | Hassan Pur, A`li Reza | Yektan Khodaei, Maryam | Saeidi, Gholam | Dehqan, Hassan
Date bunch fading disorder is one of the most important problems for date growers in Bushehr, Kerman, Hormozgan and Khouzestan provinces, so the effects of time and methods of bunch thinning were studied with a split plot experiment in Randomized Complete Block Design with 4 replications during 2003 and 2004. The treatments were comprised of time of thinning at 2 levels ( pollination and kimri stages) as main plots and thinning methods at 5 levels( control, cutting back 10 and 30 percent of bunch tip , cutting back 10 and 30 percent of central strands) as subplots. The experiment was carried out on three cultivars i.e. Kabkaab, Mordasang and Mozafti in Bushehr, Hormozgan and Kerman provinces, respectively. The results showed that thinning caused significant decreases (ل= 0.05) in fading disorder in examined cultivars. The minimum percent of fading disorder in Kabkaab, Mordasang and Mozafti were observed in cutting back 30 percent of bunch tip, 10 percent of bunch tip and 30 percent of central strands, respectively. Time of thinning had no significant effect on any of the characteristics. The interaction of time and methods of thinning treatments on fading disorder were significant (ل= 0.05) for Kabkaab and Mordasang but not significant for Mozafti cultivar. Also, increasing of weight, length and fruit diameter were seen after bunch thinning. Thinning the 30 % of bunch tip in Kabkaab showed significant increase in pulp to seed ratio in comparison with control and other treatments. TSS was increased in Kabkaab by bunch thinning significantly. Time and Thinning methods had no significant effect on pH, ripening time and humidity percent of Kabkaab and Mordasang cultivars.
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