Effect Of NPK Fertilization Rates on Streptomyces Scabies the Causative of Common Scab Disease on Potato Tubers and Crop Productivity in the Western Region – Libya
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Fertilization, Common Scab, Incidence, Severity of Injury, Potato, Libya
Abstract
Ple our experiments were carried out in spring and autumn growing seasons using two potato cultivars at Agricultural Research Station in Al-Zahra, in order to study the effect of NPK on Streptomyces scabies causing common scab disease on potato tubers under natural field infestation. Plots were fertilized by hand-scattering in rows at planting with levels of Nitrogen, Phosphorus and, Potassium. Soil analysis of experimental sit indicates that is poor in nitrogen, organic matter, potassium, cation exchange capacity, soil (pH) is 7.6 and, it is very suitable for potato cultivation due to their physical properties, with an estimated production capacity index 67.5%. Results showed the presence of common scab disease on produced tubers in all fertilization rates. The average scab incidence was between 37.3-40%, while the severity index ranged from 26.2-48%. Common scab incidence and severity index ranged between 34.7-48% and 27.1-34.9% on Spunta tubers and, 20-48.6% and 5.2-26.9% on Atlas at different NPK fertilization levels under natural field infestation in autumn 2008. Potassium fertilization contributed to reduce the incidence of scabies by about 59.7%. Results confirm that nitrogen and phosphorus (DAP) fertilizers are not reliable in controlling common scab on potatoes under local conditions. More research need to improve potato productivity and quality with addition of micro-elements to enhance the healthy strength and, its ability to resist common scab disease under Libyan conditions.
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