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Effects of Zn, S, Mo and B on Seed Production of Cauliflower

S. N. Mozumder
Scientific Officer
Regional Horticulture Research Station, RARS, Hathazari, Chittagong

A. S. M. H. Rashid
Scientific Officer
Regional Horticulture Research Station, RARS, Hathazari, Chittagong

T. K. Paul
Senior Scientific Officer
Regional Horticulture Research Station, RARS, Hathazari, Chittagong

M. M. H. Molla
Scientific Officer
Hill Agricultural Research Station,Khagrachari

K. M. Khalequzzaman
Scientific Officer
Regional Horticulture Research Station, RARS, Hathazari, Chittagong

Abstract/ Executive Summary:

The effects of fourteen nutrient combinations comprising four levels each of S (0, 12, 24, 36 kg/ha), Zn (0, 2, 4 & 6 kg/ha), Mo (0, 0.5, 1.0 & 1.5 kg/ha) and B (0, 1, 2 & 3 kg/ha) were studied on cauliflower seed productionat the Regional Horticulture Research Station, RARS, Hathazari, Chittagong in consecutive three years from October 1997 to April 2000. There were no remarkable effects of S, Zn and Mo observed in respect of plant height and thousand seed weight of cauliflower. Application of incremental rate of S, Zn, Mo and B increased seed yield up to a certain level then declined. Boron deficiency severely affected on the seed production of cauliflower. Brown rot disease appeared in absence of B and seed production reduced severely. The maximum seed yield (5.73q/ha), gross return (Tk 3.436 lakh/ha), net return (Tk 2.791 lakh/ha) and BCR (5.32) were obtained from the nutrient combination S36Zn4Mo1B2 kg/ha. The calculated optimum and economic nutrient combination from the polynomial regression equation of the experimental result were S36Zn4.5Mo1.6B2.3 and S30Zn4.4Mo1.3B2.3 kg/ha, respectively.

Keywords: Cauliflower, Seed, Micronutrients

Location: Regional Horticulture Research Station, RARS, Hathazari, Chittagong

Start Date: 01-10-1997

End Date: 30-04-2000

Program Area: Crop-Soil-Water Management

Commodity: Cauliflower

Objectives:

To know the effect of these elements on seed production and to find out the optimum dose of S, Zn, Mo and B for seed production of cauliflower.

Methodology:

The experiment was conducted at the Regional Horticulture Research Station, RARS, Hathazari, Chittagong in consecutive three years from October 1997 to April 2000. The soil was silt loam with 5.9 pH and 0.70% organic matter. There were fourteen treatments combination comprising of four levels of S (0, 12, 24, 36 kg/ha), four levels of Zn (0, 2, 4 & 6 kg/ha), four levels of Mo (0, 0.5, 1.0, 1.5 kg/ha) and four levels of B (0, 1, 2 & 3 kg/ha). The experiment was laid out in RCB design with three replications. Seedlings were transplanted in the 3.6x3.6m unit plots accommodating 36 plants per plot in six rows with 60x60cm spacing. A well adopted popular local OP cauliflower cultivar “Bailtali” was used in the experiment. It is a high yielding, mid season cauliflower variety capable to produce profuse seeds under Chittagong conditions. Seeds were sown on mid-October and one Month old seedlings were transplanted on mid-November in 1997 and 1999 while it was delayed by 2 weeks in 1998 due to late rainfall in the experimental area. The nutrient elements S, Zn, Mo and B were supplied in the form of gypsum, zinc oxide, molybdic acid and boric acid, respectively. Manures and fertilizers were applied at the rate of cowdung 5 t, N 120 kg, P₂O₅ 80 kg and K₂O 120 kg/ha. The total quantity of cowdung was applied during the land preparation. The entire amount of TSP, gypsum, molybdic acid and boric acid and half of each urea and MP were applied as basal doses in the pit while the rest of urea and MP were applied as top dressing in three equal installments at 15, 30 and 45 days after transplanting. Other intercultural operations e. g. weeding, mulching, irrigation was done when required. The crop was free from insect pest infestation so that no control measures were taken. Data on days to flowering, plant height, number of branches per plant, number of pods per plant and weight of seeds per plant were recorded from 10 randomly selected plants from the inner rows of the plots. Seed yield and profitability was calculated from the weight of seeds/plant. Economic calculation was done on the basis of local market price of inputs and output (Tk 600/-/kg seed). All the data were analyzed statistically. The polynomial regression analysis was done and optimum dose of nutrient elements for maximum yield and economic yield were calculated from simple polynomial regression equations i e. Y = + 1x + 2x2 (Zaman et al. 1982). Here x is the independent variable (nutrient element) and Y is the dependent variable (yield). The optimum dose of nutrient element for maximum yield is X = -1/22 and economic dose were Xe = X – (Px/Py)/22. Here Px is the price of input (nutrient element) and Py is the price of the products.

Source of Information: Bangladesh J. Seed Sci.& Tech. 7(2): 155-160. 2003.

Article Link (Online Journal):

Funding Source:

1. Government

Budget: 15000/-

Total Budget (Tk.) : 15000/-

Achievement/Findings:

From the experimental result, it was revealed that S, Zn, Mo and B positively increased seed yield of cauliflower. The higher return and BCR ensures the profitability of cauliflower seed production with different essential nutrient elements. B is essential in the deficient soil while S increased seed yield at a large extent in that particular soil. From the experimental result the optimum level of S, Zn, Mo and B for Chittagong soil is 36, 4.0, 1.0 and 2.0 kg/ha respectively for maximum seed production of cauliflower. The calculated optimum and economic nutrient combination in that soil is S36Zn4.5Mo1.6B2.3 and S30Zn4.4Mo1.3B2.3 kg/ha, respectively

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