Effects of nitrogen, phosphorus and sulphur fertilizer combinations on the severity of Alternaria, Drechslera and bacterial leaf blights of wheat
1985
Rashid, A.Q.M.B. | Meah, M.B. | Jalaluddin, M. | Razzaque, A.H.M.
The effects of 25 combinations of urea (N), TSP (P) and gypsum (S) on the severity of leaf blight caused by Alternaria triticina, Drechslera sosorokiniana and Pseudomonas syringae on the susceptible wheat cultivar "Balaka" were determined, Severity of three leaf blights was scored separately by measuring the blighted areas of upper 9-15 leaves per plant (three leaves of each of 3-5 tillers per plant) with a total of 15 plants randomly selected in each unit plot. Increase in doses of N and P singificantly decreased the severity of Alternaria leaf blight (ALB) whereas the severity of Drechslera leaf blight (DLB) and Bacterial leaf blight (BLB) increased. Dose increase of S had a significant effect on DLB only. With the exception of P/S and N/S on BLB, all combinations of two fertilizers among the treatments significantly affected the seve1930rity of all the diseases. The interaction of three fertilizers significantly favoured disease increase of ALB and DLB but not
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