Study of the relationship of Heterodera schachtii population densities to sugar beet yield in west Azarbaijan
2004
Parvizi, Rahim | Noorafcan, Majid | Fatemi, Seddigheh
To study the relationship of Heterodera schachitii and suger beet yield, in 2002- 2003 experiments were carried out in a completely randomized design with eleven treatments (0, 0.25, 0.5, 1, 2, 4, 8, 16, 32, 64, 128 eggs and guveniles/ gr soil) and eight replications. 88 12 liter clay pots 30× 30× 40 cm, were placed vertically 40 cm deep in soil in a field. The inoculum was prepared by extracting cysts from an infested field in Uromia, and mixing them with 40 kg of sterilized soil. The cysts were gathered and their content estimated and referred to as egg and J2/ gram soil. Then the pots were infested separately with the appropriate portion of inoculum to obtain mentioned densities. All pots were sown with sugar beet (Beta vulgaris) cv. BR1 in early April, and thinned to one seedling per pot. Roots were harvested and weighed in early November. The results demonstrate that mean root yield of 0, 0.25, 0.5, 1 egg and J2/ gr soil were 1762, 1714, 1697 and 1629 gram, respectively. Differences were significant at p= 1% in comparison with 2, 4, 8, 16, 32, 64, 128 egg and J2/ gr soil.
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