Effect of humic acid and available water on quality and quantity characteristic of sugar beet

In order to evaluate the effects of humic acid in drought and non-drought stress condition on yield and some quality characteristic of sugar beet, a study was conducted in 2010 in Islimic Azad Univ. of Karaj,Iran. The factor of humic acid was in three levels (non-using (control), using with irrigation water and foliar application of leaves). Another factor was limmited of irrigation, in two levels (irrigation after 40% depletion of available water and irrigation after 70% depletion of available water). In this experiment, quality and quantity characteristic of sugar beet assessed like, root yield, white sugar yield, sugar content, molasses sugar and total dry weight. Result of the experiment indicated that using of humic acid on root yield, white sugar yield, WSC and sugar content caused significant difference in 1% level. The best levels of root yield, white sugar yield and sugar yield was obtained using of humic acid with irrigation water. There was also signification difference between two levels of irrigation.