Studies on the effect of chemicals and nutrients on the control of common scab of potato.
1995
Jan H. | Hassan A. | Mohammad A. | Haider K. | Zanoni U. | Khan Z.D. | Lughmani A.M. | Khattak K. | Iman D.
A study was conducted on farmers' fields at Battakundi in upper Kaghan valley during 1992 and 1994 to find out the efficacy of treating seed potatoes and soil with fungicides and acid forming fertilizers for the control of common scab and also to see its effect on potato yield under Battakundi conditions. In 1992, the treatments included seed treatment with Formaldehyde at 4 ml/l of water and Dithane M-45 at 4 g/l of water, and soil application of ammonium sulphate at 120 kg N/ha and triple super phosphate at 168 kg P2O5/ha. In 1994, the treatments included soil application of basic dose of fertilizers (Urea at 120 kg/ha, single super phosphate at 120 kg P2O5/ha and sulphate of potash at 180 kg K2O/ha) alone and in combination with ammonium sulphate (for N) at 120 kg N, triple super phosphate (for P) at 168 kg P2O5, and elemental sulphur at 500 kg/ha. In 1992, the application of ammonium sulphate significantly decreased the incidence of common scab and increased the total yield. The other treatments did not affect the scab incidence or yield. While in 1994, all the treatment combinations of acid forming fertilizers reduced the disease incidence and severity, as well as increased the average tuber number and yield over control significantly. However, ammonium sulphate greatly reduced the disease incidence and severity as compared to all other treatments. The application of ammonium sulphate and urea was found most economical in reducing the disease index and increasing the yield.
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