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Effect of Plant Spacing on Alternaria Blight and Seed Yield of Cabbage

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

I. H. Mian
Professor
BSMRAU, Salna, Gazipur

Abstract/ Executive Summary:

Six different plant spacing viz. 60 x 60 cm, 60 x 50 cm, 50 x 50 cm, 50 x 40 cm, 40 x 40 cm and 40 x 30 cm were tested to find out their effect on the severity of Alternaria blight (Alternaria brassicicola and A. brassicae) and seed yield of cabbage. The severity of Alternaria blight increased with the decrease in plant spacing showing maximum at the closest spacing (40x 30 cm) and minimum at the widest spacing (60 x 60 cm). Wider plant spacing appreciably enhanced the yield contributing characters like number of pod, pod length, number of seed and seed yield per plant including 1000 seed weight. Seed yield per hectare increased with decreasing plant spacing and maximum seed yield of 330 kg was obtained at 50 x 40 cm spacing. Considering per hectare seed yield and seed-borne diseases, better plant spacing for cabbage were 50 x 40 cm and 40 x 40 cm. However, plant spacing 50 cm x 40 cm was noted as the best spacing for the higher yield of good quality cabbage seed production.

Keywords: Cabbage, Alternaria blight, Seed production, Plant spacing

Location: BSMRAU, Salna, Gazipur

Start Date: 01-07-2000

End Date: 30-06-2001

Program Area: Pest Management

Commodity: Cabbage

Objectives:

An experiment was undertaken to determine the effect of plant spacing on the severity of Alternaria blight and seed yield of cabbage.

Methodology:

The experiment was conducted during 2000 - 01 winter season at Bangabandhu Sheikh Mujibur Rahman Agricultural University (BSMRAU), Salna, Gazipur. Six different rows to row and plant to plant spacing namely, 60 x 60 cm (S₁), 60 x 50 cm (S₂), 50 x 50 cm (S₃), 50 x 40 cm (S₄), 40 x 40 cm (S₅) and 40 x 30 cm (S₆) were considered. Forty days old seedlings of BARI Cabbage-2 (Agradute), raised in polyethylene bag were planted on November 1 in 3 M x 1.2 M, 2.5 M x 1.2 M, 2.5 M x 1.0 M, 2.0 M x 1.0, 2.0 M x 0.8 M and 1.5 M x 0.8 M plots. The spacing S₄ was considered as standard practice in Bangladesh. Ten seedlings were transplanted in each plot in two rows. The experiment was laid out in a Randomized Complete Block Design with three replications. Recommended dose of manure and fertilizers were applied in the bed before transplanting (Razzaque et al., 2000). Fifty-centimeter wide and 30 cm deep drain was made surrounding each block for facilitating irrigation and drainage. Subsequent weeding, mulching and irrigation were done as and when necessary. Aphid infestation was controlled by spraying Malathion 57 EC @ 1.5 ml/ l. Five plants from each plot were randomly selected and tagged for data collection. Data on percent disease index (PDI) of leaves was calculated according to Meah (1994) at the end of February 2001. 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 of each plot were stacked for 4 days (Zaman and Rashid, 1992), sun dried and then threshed manually for seed.

Source of Information: The Agriculturist. 2: 40-44 (2004)

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The incidence and severity of Alternaria blight of cabbage increased with the decrease in plant spacing showing maximum disease incidence at the closest spacing (40 x 30 cm) and minimum at widest spacing (60 x 60 cm). The lowest PDI of leaf (34.4) was recorded under S₁, which was statistically similar to that of S₂, S₃and S₄ (Table 1). The highest PDI (64.8) was observed under S₆, which was statistically similar to S₅ and S₄. The lowest number of spot per pod (1.8) was recorded in S₁, and the highest (9.4) in S₆. Effect of the three higher spacing regarding Alternaria blight was statistically Significantly lower percentage of pod infection (21.62) was recorded under S₁, which was statistically similar to S₂ and S₃. Significantly the highest pod infection (47.89) was recorded when the plant spacing was the lowest (40 x 30 cm). Disease severity in terms of pod area diseased was minimal (1.2) under the widest spacing (S₁), which was followed by S₂, S₃ and S₄. Plant spacing appreciably influenced the yield and yield contributing characters of cabbage seed crop. The highest number of 222.3 pods per plant was obtained from widest spacing (S₁) and the lowest number of 156.0 from the closest spacing (S₆). Statistically similar number of pod per plant was recorded from S₁, S₂ and S₃, which was significantly higher compared to those of S₅ and S₆. The trend in pod length was identical to the trend found in pod number per plant. The highest number of seed per pod (11.3) was recorded under the maximum spacing (S₁), which was statistically similar to S₂. The lowest number of seed per pod (5.4) was obtained from the closest spacing (S₆), which was followed by S₅ and S₄. The maximum 1000-seed weight (3.9 g) was recorded under S₂, which was statistically similar to those of S₁, S₃ and S₅. The lowest 1000-seed weight (3.34 g) was found under S₆, which was statistically similar to those of S₅, S₄ and S₃ (Table 2). Seed yield per plant was the highest (7.27 g) under the widest spacing (S₁) and the lowest (4.0 g) under the closest spacing (S₆). In general, seed yield per plant decreased with decreasing plant spacing from S₁ to S₅ though they were statistically similar. The per hectare seed yield was maximum of 300.88 kg in S₄, which was statistically similar to S₅, S₆ and S₃. The lowest seed yield of 201.36 kg per hectare was obtained from the widest spacing (S₁)

Knowledge Management: Journal