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Effects of Zinc and Boron on Yield, Nodulation and Nutrient Contents of Fieldpea in Terrace Soils

M. A. Quddus
Senior Scientific Officer (SSO)
Horticulture Research Centre, Bangladesh Agricultural Research Institute (BARI), Gazipur

M. A. Hossain
Chief Scientific Officer,
Soil Science Division, BARI, Gazipur

H. M. Naser
Principal Scientific Officer
Soil Science Division, BARI, Gazipur

S. Akhtar
Scientific Officer
Pulses Research Sub-Station, BARI, Gazipur, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted for two consecutive years (2014-15 and 2015-16) in the field of Pulses Research Sub-Station, BARI, Gazipur during rabi (winter) season to evaluate the effect of zinc (Zn) and boron (B) application on the yield, nodulation and nutrient content of fieldpea (Pisum sativum L.). There were 16 treatment combinations comprising four levels each of zinc (0, 1, 2 and 3 kg ha^-1) and boron (0, 1, 1.5 and 2 kg ha^-1) along with a blanket dose of N₁₂ P₁₈ K₃₀ S₁₀ kg ha^-1 over the treatments. The experiment was laid out in a split-plot design with three replications. Zinc (Zn) as ZnSO₄.7H₂O and boron (B) as H₃BO₃ were applied to the crop (cv. BARI Fieldpea-1). Results showed that the combination of Zn₃B_1.5 kg ha^-1 produced the highest seed yield (1582 kg ha^-1) in the 1st year and the Zn₃B₂ kg ha^-1 gave the highest yield (1702 kg ha^-1) in the 2nd year.The lowest seed yield was found in the control (Zn₀B₀). The Zn₃B₂ demonstrated the highest nodulation and nutrient and protein contents. The results suggest that the application of Zn₃B₂ kg ha^-1 along with N₁₂ P₁₈ K₃₀ S₁₀ kg ha^-1 can support the higher yield of fieldpea in terrace soils of Bangladesh.

Keywords: Zinc, Boron, Fieldpea, Yield, Nodulation, Nutrient content

Location: In the research field of Pulses Research Sub-Station (PRSS), Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur

Start Date: 00-00-2014

End Date: 00-00-2016

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

The present study was therefore, undertaken (i) to evaluate the effect of Zn and B on yield, nodulation and nutrient content of fieldpea; and (ii) to find out the suitable combination of Zn and B for yield maximization of fieldpea.

Methodology:

A field experiment was conducted for two consecutive years (2014-15 and 2015-16 at winter) in the research field of Pulses Research Sub-Station (PRSS), Bangladesh Agricultural Research Institute (BARI), Joydebpur, Gazipur. The terrace soils of Gazipur is medium high land with fine-textured (clay loam) and belongs to Chhiata series (Soil taxonomy: Udic Rhodustalf) under the agroecological zone - Madhupur Tract (AEZ-28). Before beginning the experiment initial soil (0-15 cm) sample was collected from the field and analysed for chemical properties. The soil contains 6.6 pH, 1.26% organic matter, 0.057% N, 15.5 ppm P, 16 ppm S, 0.8 ppm Zn and 0.17 ppm B. There were 16 treatment combinations comprising four levels each of Zn (0, 1, 2 and 3 kg ha^-1) and four levels of B (0, 1, 1.5 and 2 kg ha^-1). The blanket dose was N₁₂ P₁₈ K₃₀ S₁₀ kg ha^-1. The experiment was laid out in split-plot design with three replications. The unit plot size was 4 m × 3 m. Zinc and B were applied as zinc sulphate and boric acid, respectively. Every plot received an equal amount of fertilizers at N₁₂ P₁₈K₃₀ S10 kg ha^-1 (FRG, 2012) as urea, TSP, MoP and gypsum during final plot preparation. Seeds of fieldpea cv BARI Fieldpea-1 were sown @ 30 kg ha^-1 with a spacing of 40 cm × 05 cm on 12 November 2014 and 10 November 2015. Two hand weedings were done at 25 and 50 days after sowing. Diseases and insects were controlled properly. The crop was harvested after maturity. The data of nodule per plant was recorded from 5 randomly selected plants in each plot. Stover yield (kg ha^-1) was measured from two places in each plot over one square meter. Seed yield (kg ha^-1) was recorded from the whole plot technique.
Treatment-wise plant samples (stover and seed) against each treatment plot were oven-dried at 70° C for 48 h and finely ground. The initial soil sample was analyzed for soil pH was measured by glass electrode pH meter using soil:water ratio of 1:2.5 (Page et al., 1982) and organic matter by Nelson and Sommers (1982) method; total N (Bremner and Mulvaney, 1982); exchangeable K by 1N NH₄OAc method (Jackson, 1973); available P by Bray and Kurtz (1945) method; available S by turbidity method using BaCl₂ (Fox et al., 1964); available Zn by DTPA method (Lindsay and Norvell, 1978); available B by azomethine-H method (Page et al., 1982). Ground plant sample (stover and seeds) was analysed for N using the Kjeldahl method FOSS (Persson et al., 2008). Ground plant samples (seed and stover) were digested with di-acid mixture (HNO₃-HClO₄) (5: 1) as described by Piper (1966) for the determination- content of P (spectrophotometer method), K (atomic absorption spectrophotometer method), S (turbidity method using BaCl2 by spectrophotometer), Zn (atomic absorption spectrophotometer method) and B (spectrophotometer following azomethine-H method).
Protein content in fieldpea seed was calculated on considering the pulses food factor 5.30 (FAO, 2018). Protein content was measured by multiplying the %N content of seed with pulses food factor 5.30 that means (%N × 5.30).
Analysis of variance (ANOVA) for the yield, nodulation, different nutrient and protein content was done following the Statistix 10 package (Statistix 10. 1985). The least significant difference (LSD) at 5% level was used to compare the treatments means.

Source of Information: Bangladesh J. Agril. Res. 43(3): 441-451, September 2018 ISSN 0258-7122 (Print), 2408-8293 (Online)

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Achievement/Findings:

This study indicates that application of Zn at 3 kg ha^-1 and B at 1.5 or 2 kg ha^-1 significantly increased the seed yield of fieldpea. The maximum nodulation and protein percentage was found in Zn₃B₂ treatment followed by Zn₃B_1.5 treatment. Similarly nutrient (N, P, K, S, Zn and B) contens were also higher in the treatment combination of Zn₃B₂ followed by Zn₃B_1.5. Thus, results of the experiment suggest that the application of Zn₃B₂ along with N₁₂ P₁₈ K₃₀ S₁₀ kg ha^{- 1} is needed for yield maximization of fieldpea.

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