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Effect of municipal compost on growth and yield of sugar beet

A field experiment was conducted in Khorasan agricultural research center in order to investigate the effect of municipal compost and its fortification with chemical fertilizers on growth and yield of sugar beet (Beta vulgaris). A complete randomized block designe with four replications were used. Treatments consisted of: Control (without fertilizer); Chemical fertilizers; Animal manure and Compost used separately and in combination with fertilizers and manure. Significant difference (at 5% level) were found for parameters like extractable and total sugar yield, percent of extractable and total sugar, and harmful nitrogen concentration in plant tissues between treatments. Application of compost, animal manure and chemical fertilizer, increased root and sugar yield compared with control. Using 40 Mgh-1 compost along with 50% chemical fertilizer had a higher yield than chemical fertilizer alone, however, their difference was not significant. Thus, it appears that 50 percent of needed fetilizer may he replaced by compost. Adding 40 Mg animal manure per hectare alone, partly increased root yield. When this treatment was fortified with two times of urea dressing, maximum root yield,was obtained whereas its fortification with a mixture of chemical fertilizers and 50% of recommended amount put the root yield on top1.