Response of Black Bean Aphid [Aphis fabae Group (Homoptera: Aphididae)] Population to Irrigation and Nitrogen Fertilizer in Sugar Beet
Author(s):
Ghorbanir. , Hatamib. , Khajehali , J
Abstract:
The effects of irrigation periods and fertilizer nitrogen rates on population of black bean aphid were studied in sugar beet fields of Isfahan University of Technology for two years. Experiments were carried out as splitplot in a complete randomized block design with four replications.Irrigation factor in three levels (100%, 75% and 50% plant water requierment in 2005 and irrigation after 70, 105 and 140 mm cumulative evaporation from class A pan in 2006) and nitrogen fertilizer in three levels (200, 150 and 100 kg/ha net nitrogen in both years) were allocated to main and subplots respectively. Pest population was assessed by weekly sampling. The highest mean population of black bean aphid was observed in 100% irrigation treatment in the first year and in irrigation after 70 mm evaporation treatment in the second year and in 200 kg/ha nitrogen treatment in both years. As irrigation cycle doubled in 200 kg/ha net nitrogen treatment, population of black bean aphid increased by 177.9 times.
Keywords:
Language:
Persian
Published:
Journal of Agricultural Biotechnology, Volume:8 Issue: 2, 2010
Page:
103
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