Evaluation of new drought tolerant sugar beet genotypes.
2008
Fath Ol-Lah Taleqani, Daryush | Khayamim, Samar | Sadeq Zadeh Hemayati, Sa`id | Habib Khodaei, A`li | Mesbah, Mahmud
This experiment was conducted to evaluate new drought tolerant sugar beet genotypes in Karaj research farm (Motahary station) during 2005-2006. Eight new sugar beet genotypes with different drought tolerances and three irrigation treatments including normal irrigation, early season and season-long stress were studied in a split plot experiment based on randomized complete block design with three replications. Drought stress treatment increased sugar content by 8.7%. Normal irrigation (irrigation after 80 mm transpiration from pan) and early season stress were in the same statistical group for root yield, white sugar yield and root/shoot ratio. Although early season stress with 66 t/ha root yield production had 6 t/ha yield loss, it increased water use efficiency by 35 % in comparison with normal irrigation but had root and white sugar yields similar to normal irrigation. So, sugar beet can tolerate a long- term stress (about 50 days) at beginning of season and decrease in water application about 2000 m3/ ha with out any reduction in final yield. BP Karaj and 7221-II with 12.7 and 7.99 % had maximum and minimum polarity, respectively. Maximum sugar content, white sugar yield, water use efficiency and stress tolerance index were related to 7112, BP Karaj and RS003 and minimum of these factors was related to 7221-II. 7221- II*I13 increased sugar content, white sugar yield, water use efficiency and stress tolerance index about 22,49, 62 and 187 percent, respectively, in comparison with 7221-II. Although 7221-II*I13 indicated one percent decrease in root yield, it had better yield stability than other genotypes.
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