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Studies on the Effect of Nutrient Elements on the Management of Alternaria Blight of Cabbage Seed Crop

Dr. Md. Sakhawat hossain
Senior Scientific Officer
Plant Pathology Division, BARI, Gazipur

I. H. Mian
Professor
BSMRAU, Salna, Gazipur

Abstract/ Executive Summary:

The experiment was conducted during 2001 -2002 crop season to study the effect of soil nutrient management to suppress Alternaria blight (Alternaria brassicicola) of cabbage seed crop. Five nutrient elements viz. S - Zn - Mg - Mo - B were applied in 10 different combinations (including a control) as T₁= S₀-Zn₅-Mg₁-Mo₁-B₁, T₂ = S₂₀-Zn₀-Mg₁-Mo₁-B₁, T₃ = S₂₀-Zn₅-Mg₀-Mo₁-B₁_, T₄ = S₂₀-Zn₅-Mg₁-Mo₀-B₁, T₅ = S₂₀-Zn₅-Mg₁-Mo₁-B₀_,T₆ = S₂₀-Zn₅-Mg₁-Mo₁-B₁, T₇ = S₂₀-Zn_7.5-Mg₁-Mo₁-B₁, T₈ = S₃₀-Zn₅-Mg₁-Mo₁-B₁, T₉ = S₃₀-Zn_7.5-Mg₁-Mo₁-B₁ and T₀ = S₀-Zn₀-Mg₀-Mo₀-B₀ (control) in addition to the recommend dose of N, P, K and cowdung. The variety BARI Cabbage-2 (Agradute) was planted in 1m x 2m plots laid out in RCB design with three replications. All the treatments except T₁ (S₀-Zn₅-Mg₁-Mo₁-B₁) significantly reduced disease severity and increased seed yield and yield contributing characters. The significantly lowest disease severity (PDI of leaf, pod spotting and percent pod area diseased) and the highest seed yield and yield contributing characters were recorded in the treatment T₈ (S₃₀-Zn₅-Mg₁-Mo₁-B₁) followed by the treatment T₆ (S₂₀-Zn₅-Mg₁-Mo₁-B₁). The nutrients S, Zn and Mg were found very important in increasing seed yield and yield component with the reduction of Alternaria blight severity. The micronutrients B and Mo had no effect on disease severity and seed yield. Zinc at more than 5 kg/ ha showed adverse effect on growth and seed yield.

Keywords: Nutrient element, Alternaria blight, Cabbage, Seed

Location: BSMRAU, Salna, Gazipur

Start Date: 01-07-2001

End Date: 30-06-2002

Program Area: Pest Management

Commodity: Cabbage

Objectives:

To determine the best nutrient combination for the management of Alternaria blight of cabbage seed crop.

Methodology:

During 2001-2002 winter season, a field experiment was conducted to study the effect of five essential nutrient elements on the management of Alternaria blight of cabbage seed crop. Among the five elements S was applied at 0, 20 and 30 kg/ ha; Zn at 0, 5 and 7.5 kg/ ha and Mg, Mo and B were applied at 0 and 1 kg/ ha. The five nutrient elements (S - Zn - Mg - Mo - B) were applied in 10 different treatments combination as T₁= S₀-Zn₅-Mg₁-Mo₁-B₁, T₂ = S₂₀-Zn₀-Mg₁-Mo₁-B₁, T₃ = S₂₀-Zn₅-Mg₀-Mo₁-B₁_, T₄ = S₂₀-Zn₅-Mg₁-Mo₀-B₁, T₅ = S₂₀-Zn₅-Mg₁-Mo₁-B₀_,T₆ = S₂₀-Zn₅-Mg₁-Mo₁-B₁, T₇ = S₂₀-Zn_7.5-Mg₁-Mo₁-B₁, T₈ = S₃₀-Zn₅-Mg₁-Mo₁-B₁and T₉ = S₃₀-Zn_7.5-Mg₁-Mo₁-B₁ and T₀ = S₀-Zn₀-Mg₀-Mo₀-B₀ (control). Among the treatments T₆ was considered as standard dose of nutrients (Srivastava and Verma, 1984; Iqbal et al., 1989; Panigrahi et al., 1990). Treatments T₁, T₂, T₃, T₄ and T₅ were missing with S, Zn, Mg, Mo and B, respectively. The treatment T₀ = S₀-Zn₀-Mg₀-Mo₀-B₀ received no nutrient mentioned above, which served as control. Cow dung, N, P and K was applied as per recommendation (Razzaque et al., 2000). Gypsum, zinc sulphate, magnesium sulphate, sodium molybdate and boric acid were applied for S, Zn, Mg, Mo and B, respectively. Amount of nutrient element was calculated on the basis of their active ingredient and they were applied in the pits just before transplanting of seedlings. The experiment was laid out in a Randomized Complete Block Design (RCBD) with three replications. Seedlings of variety BARI cabbage-2 (“Agradute”) were transplanted on November 1, 2001. Forty days old seedlings were transplanted in 2 m x 1 m plots maintaining a spacing of 50 cm between lines and 40 cm between plants within a line. Ten seedlings were transplanted in each plot in two rows. Subsequently weeding, mulching and irrigation were done as and when necessary. The head was incised to facilitate flower bud emergence at the middle of January. Aphid infestation was controlled by spraying with Malathion 57 EC @1.5 ml/ l. For data collection five plants from each plot were randomly selected and tagged. Data on percent disease index (PDI) of leaf was recorded according to Meah (1994) at the end of February 2002. At 70% pod maturity (partial yellowing) data on infected pod (%), number of spot/pod, percent pod area diseased (Rahman and Meah 2000), number of pod /plant, pod length, number of seed/pod, seed yield per plant and per hectare were recorded just before or after harvest. After harvest the plants were stacked for 4 days (Zaman and Rashid 1992) and then dried under sun and threshed manually for seed.

Source of Information: Bangladesh J. Agril. Res.30(2):319-328. 2005

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

All the treatments except T₁ significantly reduced the disease severity compared to control. The PDI of leaf and number of spots per pod under different treatments ranged 26.1 - 67.1 and 1.47 - 14.17, respectively. Both the parameters under different treatments were statistically similar and significantly lower compared to T₁ and T₀_. Except T₁ other eight treatments significantly reduced the percent pod infection compared to control. The lowest percentage of pod infection was recorded on pod harvested from plant under the treatment T₈_, which was statistically similar with that of T₃_, T₄, T₆ and T₇ plots. The percent pod infection under the treatments T₅ and T₉ was also statistically similar. All the treatments significantly reduced the percent pod area diseased as compared to control. Percentage of pod area diseased was the lowest on pod harvested from T₈, which was statistically similar to T₉, T₇, T₆, T₅ and T₄. The maximum number of pod/ plant and the highest pod length were recorded under the treatment T₆ (standard) which was statistically similar to those recorded under T₅, T₄, T₈ and T₉. The number of pod/ plant under T₁, T₂, T₃, T₄, T₇ and T₉ did not differ significantly compared to control (T₀). Pod length under T₁, T₂ and T₃ was also statistically similar with control treatment (T₀). Except T₃ other treatments significantly increased the seed number/ pod compared to T₀ (control) and the significantly highest number of seed per pod was recorded in pod harvested from T₆ followed by T₈ and T₅but effect of these treatments was statistically similar. The seed size in terms of 1000-seed weight was significantly increased due to application of test nutrients in eight different combinations as compared to control. The significantly highest 1000-seed weight was recorded under T₆. The second highest 1000-seed weight was obtained from T₇ treated plot which was statistically similar to T₈. The 1000-seed weight under T₉, T₅ and T₄ was statistically similar but significantly higher as compared to T₁ and T₃. All the treatments, except T₃ significantly increased per plant seed yield compared to control. The maximum seed yield/ plant was recorded under T₈, Seed yield/ ha under the treatments T₅, T₆ and T₈ was statistically similar but significantly higher as compared to other treatments except T₄. The lowest seed yield (219 kg/ ha) was recorded under control.

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