Abstract
Effect of soil application of eight combinations of NPK fertilizers on the severity of black spot disease (BSD), caused by Alternaria brassicae (Sacc.) Berk., and yield of short duration oilseed rape (Brassica campestris L) were investigated under both pot and field conditions in 1987–88, 1988–89 and 1990–91. The severity of BSD was significantly greater (36–48%) on plants grown in ground treated with NP (N 90 kg ha−1+P 40 kg ha−1) applied as urea and single superphosphate respectively than on plants from the unfertilized control (NoPoKo) (o). However, the severity of BSD was significantly smaller (25–33%) when K (40 kg ha−1) was applied as muriate of potash than in plants from control and NP treatments. The effect of NK (N 90 kg ha−1+K 40 kg ha−1) in decreasing the severity of BSD was increasingly more pronounced than the effects of PK (P 40 kg ha−1+K 40 kg ha−1), NP and K (40 kg ha−1) applications. The decrease in the severity of BSD due to K was due to increased production in plants of phenolics which inhibited conidial germination and decreased sporulation of A. brassicae.
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