Methodology of drought stress imposition on sugar beet

Water crisis as a main factor of agronomy limitation exists in all over the arid and semiarid area.sensitive of the plant in all of the growth stages and different cultivar in drought stress are not same.So in order to assessment of different germ plasm for make resistance drought of cultivar was requiring a one methodology of drought stress treat. In order to the experiment was conducted in a completely randomized block design, on basis of split plot with eight irrigation treatment and four cultivar in four replications.Main factors consist of 8 irrigation treats with making use of Furrow and trickle irrigation methods after 30mm (except Furrow irrigation) 80, 130 and 180 mm evaporation from basin class of A and in order to creation of condition equal irrigation, 4 genotype 7112, BP Karaj, BP Mashad and BP(I13*A37.1) with Latin square design as sub plots. The experiment was conducted in 2008 and 2010 in Hamedan and Alborz provinces.The results of combined analysis of variance in Hamedan showed that different irrigation treatments had significant difference for alkalinity. There was significant difference for interaction of irrigation and environment for quantitative and qualitative traits. There was significant difference between 4 genotypes with respect to alpha-amino nitrogen, alkalinity, extraction coefficient percentage and molassed sugar. There was no significant difference for interaction of irrigation and genotype in any trait.The results of combined analysis of variance in Karaj showed that between different irrigation treatments there was significant difference (á = %1) for root yield, sugar yield and white sugar yield. Also, there was significant difference between different irrigation treatments in potassium, alpha-amino nitrogen and molassed sugar . There was significant difference for interaction of irrigation and environment for root dry matter, sugar content, white sugar content, sodium, alpha-amino nitrogen and alkalinity. There was no significant difference between 4 genotypes and interaction of irrigation and genotype in any traits.The water stress could be imposed by means of two methodologies, irrigation frequency with different intensities (furrow and trickle irrigation 180 mm) and water amount (trickle irrigation 30 mm, 50%). The results showed that the water stress by means of methodology of trickle irrigation decreased the yield of sugar beet more than furrow irrigation with level the same of irrigation. Also, the percentage of yield reduction in the drought stress imposed by the amount of water treatment (trickle irrigation 30 mm, 50%) was more severe than irrigation frequency. But the changes of qualitative traits of sugar beet in the drought stress treatments didnot follow a regular pattern. Genotypes responses were different to water stress. The water stress condition decreased the yield of resistant genotypes less than non resistant genotypes in any water stress. Eventually, the methodology of trickle irrigation 30 mm, 50% for imposing drought stress is effective for assessment and screening of breeding germplasms for development of drought resistant cultivars.