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Growth, Yield and Bulb Quality of Onion in Response to Foliar Application of Zinc and Boron (2017–2018)

S. Sultana
Soil Science Division, BARI, Joydebpur, Gazipur Bangladesh

H. M. Naser
Soil Science Division, BARI, Joydebpur, Gazipur Bangladesh

M. Akter
Soil Science Division, BARI, Joydebpur, Gazipur Bangladesh

M. A. Hossain
Soil Science Division, BARI, Joydebpur, Gazipur Bangladesh

Abstract/ Executive Summary:

Keywords: Boron, zinc, Growth, Yield, Quality, Onion.

Location: Soil Science Division, Bangladesh Agricultural Research Institute, Joydebpur, Gazipur, Bangladesh

Start Date: 00-00-2017

End Date: 00-00-2018

Program Area: Crop-Soil-Water Management

Commodity: Micronutrient, Onion

Objectives:

To study the Influence of foliar application of boron and zinc on growth, yield and bulb quality of onion.

Methodology:

A field experiment was carried out in the micronutrient experimental field, Soil Science Division of the Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur on 04 January 2018 with a view of study the Growth, Yield and bulb quality of onion (Allium cepa L.) in response to foliar application of zinc and boron. The experiment was laid out in a randomized block design (factorial) with three replications. There were 16 treatment combinations comprising 4 levels each of boron (0, 0.01, 0.02 and 0.05%) and zinc (0, 0.01, 0.02 and 0.05%).The tested variety was BARI Piaz-4. The unit plot was 1.5m × 1m. Healthy and equal-sized twenty-eight days age seedlings of onion were transplanted in line with a spacing of 15 cm row to row and 15 cm seedling to seedling. N, P, K, S were supplied from urea, TSP, MoP and gypsum respectively. All PKS and ¹/₃ of N were supplied at the time of final land preparation. The remaining two-thirds of N was applied as top-dressing at 30 and 60 days after transplanting. Irrigation was applied three times. Other intercultural operations were done as and when necessary. The source of micronutrients for boron and zinc was boric acid and zinc sulphate, respectively. Onion plants were sprayed three times with micronutrients at monthly intervals starting from 30 days after transplanting. Ten plants were selected from each plot as a unit for all observations on growth and yield. Based on the net plot yield, yield per hectare was calculated and expressed in tones per hectare. Total soluble solids (TSS) were determined by using a handheld refractometer and expressed in degree brix. Initial soil samples collected from 0-15 cm depth prior to fertilizer application, were analyzed for all-important soil parameters using standard procedures. Standard methods were used in these determinations. Soil pH was measured by a combined glass calomel electrode (Jackson, 1958). Organic carbon was determined by the wet oxidation method (Walkley and Black). Total N was determined by a modified Kjeldahl method. Calcium (Ca), magnesium (Mg) and K were determined by NH4OAc extractable method, copper (Cu), iron (Fe), manganese (Mn) and zinc (Zn) were determined by DTPA extraction followed by AAS reading. Boron (B) was determined by CaCl₂ extraction method. Available P was determined by the Bray and Kurtz method while S was determined using the turbidimetric method with BaCl₂. To study the effect of boron and zinc as foliar spray on the yield of onion, four levels of boron (0, 0.01, 0.02 and 0.05%) and 4 levels of zinc (0, 0.01, 0.02 and 0.05%) were applied at the different growth stage of onion. Foliar sprays were applied using a hand sprayer. All treatments were applied as a foliar spray on plants using a hand-operated compressed air sprayer at the 10 liter plot^-1. The time of foliar spray was 8:00 A.M. Five plants were randomly selected from each and every treatment for recording necessary yield data such as plant height (cm), bulb length (cm), bulb diameter (cm), bulb weight (g) and yield (t ha^-1). Fruit quality was total soluble solid (TSS) and vitamin C. Data were analyzed statistically and means were compared by Tukey’s multiple comparison test using Excel version 4.0 (Esumi Co. Ltd., Tokyo,Japan). The onion bulb from each treatment was cut into small slices and pooled. Samples were homogenized in a blender and a portion of the homogenate was taken to determine the bulb quality. Total soluble solids content (TSS) was determined at 20⁰C with a refractometer and reported as ^°Brix. Ascorbic acid contents(vitamin C) were measured by the classical titration method using 2, 6-dichlorophenol indophenols solution and expressed as mg 100 g-¹of fresh weight (Miller, 1998).

Source of Information: Annual Research Report 2017–2018, Soil Science Division, BARI, Joydebpur, Gazipur, Bangladesh

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

It can be concluded that the application of zinc and boron significantly affected the growth, yield and yield parameters of onion. Micronutrients play an important role which is responsible for promoting plant growth as well as bulb yield and quality of onion. High response from a combined application of B and Zn clearly demonstrated the necessity of micronutrients for improving the production of onion in the studied regions. This is the first-year study, so further trial is needed for final conclusion.

Knowledge Management: Report/Proceedings