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Effect of Npk on the Incidence of Alternaria Leaf Blight of Mustard

F. KHATUN
Senior Scientific Officer
Regional Agricultural Research Station, Jessore

M. S. ALAM
Professor
Dept. of Botany, Rajshahi University (RU), Rajshahi

M. A. HOSSAIN
Senior Scientific Officer
Pulses Research Centre, BARI, Gazipur

S. ALAM
Professor
Dept. of Botany, Rajshahi University (RU), Rajshahi

P. K. MALAKER
Principal Scientific Officer
WRC, Dianajpur, Banglades

Abstract/ Executive Summary:

A 2-year field study was carried out to find out the effect of three macro nutrients NPK on the severity of Alternaria leaf blight and yield of mustard. Nitrogen @ 80, 100, 120, 140, and 160, phosphorus @ 15, 30, and 45, and potassium @ 30, 60, and 90 kg/ha were applied. Among the nutrients, 120-30- 60 kg NPK/ha was considered as recommended dose on the basis of soil test. Fertilizer dose 120-30-90 kg/ha appeared to be the best combination of N, P, and K in reducing the disease incidence and to increase seed yield of mustard. Higher dose of K (90 kg/ha) decreased the incidence of Alternaria leaf blight but higher dose of nitrogen (140 and 160 kg N/ha) increased the disease incidence. The highest seed yield of 1718 kg/ha was obtained with 120-30-90 kg of NPK/ha which was statistically similar to the doses of 120-30-60 and 120-45- 60 kg of NPK/ha. Higher seed yield and lower disease severity was also observed under these three treatments as compared to other treatments.

Keywords: Mustard, Alternaria leaf blight, Nutrient management

Location: Regional Agricultural Research Station (RARS), BARI, Jessore

Start Date: 00-00-2004

End Date: 00-00-2006

Program Area: Crop-Soil-Water Management

Commodity: Mustard

Objectives:

To determine the optimum N, P, and K combination for the management of Alternaria blight of high yielding mustard variety BARI Sarisha-6.

Methodology:

The experiment was conducted in the calcareous soil of Regional Agricultural Research Station (RARS), BARI, Jessore during the rabi season of 2004-05 and 2005-06. The land belongs to High Ganges River Floodplain agro-ecological zone and Gopalpur soil series having high pH value (8.1) with low organic matter (1.32%). Among the three macro elements, nitrogen (N) was applied at the rate of 80, 100, 120, 140, and 160 kg/ha, phosphorus (P) at 15, 30, and 45 kg/ha and potassium (K) at 30, 60, and 90 kg/ha. The nutrient elements were applied in 10 different treatments combination viz. T₁ = 80-30-60, T₂ = 100-30-60, T₃ = 120- 30-60, T₄ = 140-30-60, T₅ = 160-30-60, T₆ = 120-15-60, T₇ = 120-45-60, T₈ = 120-30-30, T₉ = 120-30-90 kg/ha, and Tip (control). Urea, triple super phosphate, and muriate of potash were used as sources of N, P, and K. Among the treatments, T₃ was considered as standard check (BARC, 2005). The treatment T₁₀ received no nutrient and used as control. Recommended doses of S, Zn, and B were applied at the rate of 30-2-1 kg/ha (BARC, 2005). The experiment was laid out in a randomized complete block design with three replications. The unit plot size was 4m × 3m. This layout was kept undisturbed for the second year of the study. Each year, mustard variety BARI Sarisha-6 was sown on 1st week of November maintaining a spacing of 30 cm between the lines. Intercultural operation viz., weeding, irrigation, and insecticide spray were done as and when required. Data on percent infected leaf, leaf area diseased, infected siliqua, and number of spots/siliqua, yield and some yield contributing characters were recorded. The data were analyzed statistically for ANOVA and differences in means were evaluated for significance by Duncan's Multiple Range Test (DMRT). Results and Discussion

Source of Information: Bangladesh J. Agril. Res. 36(3) : 407-413, September 2011 , ISSN 0258-7122

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Based on findings of the present investigation, it may be concluded that potassium decreases the incidence of Alternaria leaf blight and the seed yield increases with the increase in level of N upto 120 kg/ha. If the level of N is increased above 120 kg/ha it reduces the seed yield and increase disease incidence. The NPK dose of 120-30-60 kg/ha with a blanket dose of 30-2-1 kg SZnB/ha is the most effective to reduce Alternaria blight and increase seed yield of mustard.

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