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Effect of Boron and Nitrogen on Yield and Hollowstem of Broccoli

M. Moniruzzaman
Senior Scientific Officer
Agricultural Research Station, BARI, Raikhali, Chandraghona, Rangamati Hill District-4531

S. M. L. Rahman
Scientific Officer
Citrus Research Station, BARI, Jaintapur, Sylhet

M. G. Kibria
Senior Scientific Officer
Plant Pathology Division, BARI, Gazipur

M. A. Rahman
Scientific Officer
Vegetable Division, HRC, BARI, Gazipur

M. M. Hossain
Scientific Officer
PRC, BARI, Ishurdi, Pabna, Bangladesh

Abstract/ Executive Summary:

A field experiment comprising six levels of boron (B) (0. 0.5, 1, 1.5, 2 and 2.5 kg/ha) and two levels of nitrogen (N) (100 and 200 kg/ha) was conducted at the Agricultural Research Station, Raikhali, Rangamati Hill District during the winter (rabi) seasons of 2004-05 and 2005-06 to find out the suitable doses of B and N for higher yield and good quality head of broccoli. There were twelve treatments replicated three times. Boron application increased plant height, number of leaves per plant, length and width of the leaf, plant spread, main head weight and head yield both per plant and per hectare significantly up to 1.5 kg/ha. Nitrogen application at higher dose (200 kg/ha) also significantly gave higher values for all growth and yield attributes as well as yield. Interaction effect of these nutrients was also found significant on all growth parameters except width of leaf, yield attributes and yield. Maximum yield per hectare was obtained at 2 kg B plus 200 kg N per hectare which was at par with 1.5 kg B plus 200 kg N per hectare and 1.5 kg B plus 100 kg N per hectare. The latter combination (1.5 kg B/ha + 100 kg N/ha) gave the lowest hollow stem in broccoli during both years. Response curve indicates 1.59 kg B/ha as optimum dose for this crop.

Keywords: Hollowstem, Yield, Quality, Hill Tracts, Broccoli

Location: Farm of Agricultural Research Station, BARI, Raikhali, Rangamati Hill District

Start Date: 07-11-2004

End Date: 14-02-2006

Program Area: Crop-Soil-Water Management

Commodity: Broccoli

Objectives:

Objective of the study was to find out the suitable doses of B and N for higher yield and good quality head of broccoli for Hill Tracts.

Methodology:

The experiment was conducted at the Agricultural Research Station, Raikhali in the district of Rangamati during the Rabi seasons of 2004-05 and 2005-06. The experimental field belongs to AEZ 29 with the Piedmont plain soil having medium loamy to moderately fine texture (sandy clay loam). The initial soil analysis were done.The experiment was laid out in a randomized complete block design with three replications having six boron levels (B₀ = 0, B_0.5= 0.5, B₁ =1.0, B_1.5 = 1.5, B₂ = 2.0 and B_2.5 = 2.5 kg/ha ), and two nitrogen levels (N₁₀₀ =100 and N₂₀₀= 200 kg/ha). There were 12 treatment combinations all together. The unit plot size was 4 m × 2.4 m and the plant spacing was 60 m x 50 m. Manures and fertilizers were applied to the soil @ 10 tones well rotten cowdung, 70 kg P₂O₅, 105 kg K₂O, 20 kg S per hectare and N and B as treatment wise. The sources of nitrogen, P₂O₅, K₂O, S and B were urea, triple supper phosphate (TSP), muriate of potash (MP), gypsum and borax, respectively. The total amount of cowdung, TSP and gypsum and one-third amount of urea and MP were applied 5 days prior to planting seedlings. Full amount of borax was applied in pit and the remaining quantity of urea and MP was top dressed into two equal installments 30 and 45 days after transplanting. Thirty days old seedlings were transplanted on 10 November and 7 November in 2004 and 2005, respectively. Broccoli harvest was started on 11 January 2005 and 9 January 2006 and completed on 15 February 2005 and 14 February 2006. All the recommended cultural and plant protection measures were followed throughout the experimental period. The data on plant height, plant spread, number of leaves per plant, leaf size (length and width of the biggest leaf), diameter of head, primary head weight/plant, secondary shoot weight /plant, head yield/plant and hollow stem area were recorded from randomly selected 10 plants from the inner rows of each plot. The plot (9.6 m²) yield was calculated and then it was converted to per hectare yield. Data were analyzed statistically and the treatment means were separated by LSD at 5% level of significance for interpretation of results.

Source of Information: J. Soil. Nature. 1 (3):24-29, 2007

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Boron and nitrogen indicated that the treatment in which was best for vegetative growth also proved to be the same for yield. It indicates that increased vegetative growth was reflected in increased yield of broccoli head. The best treatment is the combination of 1.5 kg B and 100 kg N per hectare for maximum quality head production of broccoli in AEZ-29.

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