Abstract
In order to study of yield, growth index and physiological traits in spring sugar beet genotypes with delayed planting date, a field experiment was carried out in Chenaran in Khorasan Razavi Province in the east of Iran in 2008 cropping season. For this experiment a complete randomized block design with 4 replications and 6 treatments was used. The experimental treatments were six improved varieties: Nagano, Brigiitta, Latitia, Flores, Dorotea and 7112. The results showed that the 7112 and Flores varies had highest leaf area Index (5.8) and lowest LAI (0.38), respectively. Nagano variety had the highest total dry weight (1600gm-2), root dry weight (1200gm-2), crop growth rate (17 gm-2.day-1) and relative growth rate (0.05g.g-1.day-1). 7112 variety had the lowest total dry weight (700 gm-2), root dry weight (560g.m-2), crop growth rate (6 g.m-2.day-1) and relative growth rate (0.036g.g-1.day-1).
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