Effect of organic and inorganic fertilizers on Meloidogyne incognita infesting sugar beet
2012
Youssef, M.M.A. (National Research Centre, Cairo (Egypt). Plant Pathology Dept. | Mohammed, M.M.M. (National Research Centre, Cairo (Egypt). Plant Pathology Dept. | Korayam, A.M. (National Research Centre, Cairo (Egypt). Plant Pathology Dept.
This experiment was conducted in a field having sandy loam soil infested with root-knot nematode, Meloidogyne incognita (Kofoid & White) Chitwood. Sugar beet (Beta vulgaris L.) cv. Sallow was grown in the field. The soil was treated with a mixture of cattle manure (30m3), calcium superphosphate (15.5% P2O5) (250kg/fedden), potassium sulphate (48% K2O) (100kg/fed.), ammonium sulphate (33.5% N) (100kg/fed.) and sulphur (100kg/fed.) at the rates of 7.5, 5.0 and 2.5kg/m2 with equivalent to 30, 20 and 10 tons/fed. The mixed fertilizers were added to the soil at the time of sowing, after thinning and during root formation. Results obtained showed that the number of galls significantly decreased with increasing the applied fertilizer rates, except the number of egg-masses as the highest percentage reduction of 85.9% occurred when the plants were treated by the mixed amendments at the highest rate after thinning, while the highest reductions of 84.1 and 84.7% were achieved at the moderate rate (20 tons/fed.) at the times of sowing and root formation, respectively. As for yield of roots, production per feddan (equal to 4200 m2 area) significantly increased especially at the moderate rate of application when the plants were treated at the time of sowing. Phytotoxicity occurred at the highest rate of fertilizers.
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