Effect of Paclobutrazol Spraying and Planting Date on Bolting and Yield of Autumn Sown Sugar Beet
Subject Areas :
Majid Hosseinzadeh
1
(PhD Student - Department of Agronomy, Karaj Branch, Islamic Azad University, Karaj, Iran)
Darush Taleghani
2
(Sugar Beet Seed Institute, Agricultural Research, Education and Extension Organization, Karaj, Iran)
Saeid SADEGHZADEH HEMAYATI
3
(Sugar Beet Seed Institute, Agricultural Research, Education and Extension Organization, Karaj, Iran)
MOHAMMAD REZA ARDAKANI
4
(Department of Agronomy, Karaj Branch, Islamic Azad University, Karaj, Iran)
Davood Habibi
5
(Islamic Azad Univercity-Karaj Branch)
Keywords: " Paclobutrazol", " Sugar beet", " Autumn sown", " Bolting", " Root yield",
Abstract :
Bolting is always one of the limitations of sugar beet autumn cultivation. In this regard, a factorial experiment based on randomized complete block design with three replications was conducted on semi-resistant cultivar of Sharif at Moghan Research Station during two seasons of 2014-16. Experimental factor A (planting date) with three levels including a1 (10th October), a2 (25th October) and a3 (16 November) and second experiment factor (B) paclobutrazol foliar application with two levels b1 (300 mg / l) and b2 (no spraying). The results of combined analysis of variance showed that the effect of planting date was significant at 5% probability level for the white sugar content, root sodium, extraction coefficient sugar and molasses sugar, and also the interaction between planting date and paclobutrazol was significant for bolting at 5% probability level. Comparison of the mean data showed that the first sowing date showed the highest bolting and root yield with 20.88% and 51.52 ton / ha, respectively, and the second sowing date had 50.8 ton / ha root yield. Which was in the same statistical group as the first planting date. But the bolting on it was 5.29%. The interaction effect of second planting date and consumption of paclobutrazol with 57.44 ton / ha and 4.23% had the highest root yield and the lowest bolting, respectively.Keywords:" Paclobutrazol"," Sugar beet"," Autumn sown"," Bolting"," Root yield"
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