نوع مقاله : مقاله پژوهشی
1 دانشجوی سابق کارشناسی ارشد، گروه زراعت و اصلاح نباتات، واحد سبزوار، دانشگاه آزاد اسلامی، سبزوار، ایران
2 دانشیار زراعت، گروه زراعت و اصلاح نباتات، واحد سبزوار، دانشگاه آزاد اسلامی، سبزوار، ایران
عنوان مقاله [English]
A field experiment was conducted to evaluate the effect of seedlings age and date of transplanting on quantitative and qualitative characteristics of sugar beet at Jovein Barkat Company (60 km northeastern of Sabzevar, Razavi Khorasn) in 2011-2012. The experiment was carried out as a split plot design in a completely randomized blocks design with three replications. Factors were: seedling transplanting date (21 May, 4 June and 21 June) as main plot and seedling age (30, 40, 50, 60 and direct sowing) as sub plot. The results indicated that delayed in seedling transfer date decreased root yield by 16.45%, sugar yield by 21.77% and increased Na+ by 9.55%. Other beet quality did not affected by seedling transfer date. Increasing seedling age increased root yield and sugar content and sugar yield in comparison with direct sowing whereas seedling age did not have significant effect on sugar content, K+ content and α-amino N. overall, result suggested that transplanting on 21 June was more sensitive to seedling age. The highest root yield was observed on 60 days seedling age and transplanting on 21 May. Delay in planting date for direct sowing of sugar beet considerably reduced root and sugar yield. Overall, in a similar situation in all planting dates 60 days seedling age could be suggested for the maximum root and sugar yield but in late planting date use of 30 days seedling age is not recommended.