Effect of Paclobutrazol Spraying and Planting Date on Bolting and Yield of Autumn Sown Sugar Beet

Subject Areas :

Majid Hosseinzadeh ^{1 *} , Darush Taleghani ² , Saeid SADEGHZADEH HEMAYATI ³ , MOHAMMAD REZA ARDAKANI ⁴ , Davood Habibi ⁵

1 - PhD Student - Department of Agronomy, Karaj Branch, Islamic Azad University, Karaj, Iran
2 - Sugar Beet Seed Institute, Agricultural Research, Education and Extension Organization, Karaj, Iran
3 - Sugar Beet Seed Institute, Agricultural Research, Education and Extension Organization, Karaj, Iran
4 - Department of Agronomy, Karaj Branch, Islamic Azad University, Karaj, Iran
5 - Islamic Azad Univercity-Karaj Branch

Received: 2019-10-03 Accepted : 2021-03-11 Published : 2019-08-23

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"