Zoning determine the Sowing date, harvesting date and during the growing season for autumn sugar beet (Beta vulgaris) cultivation in Khorasan Razavi and South Khorasan Provinces

Subject Areas : Journal of Plant Ecophysiology

M. A. Javaheri ¹ (گروه زراعت و اصلاح نباتات، دانشگاه زابل، زابل، ایران)
M. R. Asgharipour ² (University of Zabol)
M. Ramroudi ³ (گروه زراعت و اصلاح نباتات، دانشگاه زابل، زابل، ایران)
M. Dahmardeh ⁴ (گروه زراعت و اصلاح نباتات، دانشگاه زابل، زابل، ایران)
A. Ghaemi ⁵ (مرکز تحقیقات کشاورزی و منابع طبیعی مشهد، مشهد، ایران)

Received: 2014-12-15 Accepted : 2015-03-12 Published : 2016-06-01

Keywords: Sugar beet, Sowing date, Khorasan, Zoning, Vernalization,

Abstract :

To calculate the threshold spring, daily and hourly temperatures during the day and in different years was calculated for each station. In order to determine the best method of interpolation, regression models, inverse distance weighting, kriging and co-kriging were evaluated. The data analysis and zoning of each layer was performed using SPSS 10.2 ARC GIS. The Results showed suitable planting date for southern part of the Khorasan Razavi Province, in Bardaskan, and in the western part of Sabzevar in this province were determined to be from 27 September to 7 October. This planting date was also recommended for the southern, eastern, and western parts of the South Khorasan Province; and suitable harvesting date for the southern parts of these provinces was from 5 May to 5 June. Because of their temperature limitations, these regions have shorter growing seasons compared to the central areas; nevertheless, they enjoy a larger number of days that are suitable for crop growth, and a greater number of growing degree-days, compared to the central areas. Zoning results showed sugar beet vernalization took place in many of the studied regions, while most regions in the southwestern part of the South Khorasan Province did not receive the total growing degree-days for vernalization and sugar beet plants were not vernalized. In these areas autumn sugar beet cultivation could be recommended only for resistant varieties to bolting.