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Zinc and Nitrogen Interaction in Hyv Rice Grown in Calcareous Soil

P K Saha
Principal Scientific Officer
Soil Science Division, Bangladesh Rice Research Institute (BRRI), Gazipur 1701

M Akter
Scientific Officer
Soil Science Division, BRRI, Gazipur 1701.

M Hossain
Senior Scientific Officer
BRRI RS, Rajshahi.

S K Zaman9
Chief Scientific Officer and Head
Soil Science Division, BRRI, Gazipur 1701.

Abstract/ Executive Summary:

This study takes an attempt to assess the interaction effect of Zn and N on the yield of HYV rice grown in calcareous soil. For this we did a field experiment at the Bangladesh Rice Research Institute (BRRI) regional station farm, Rajshahi (AEZ-11, HL) during Boro and T. Aman seasons of 2008-09. In Boro season, four doses of N (0, 40, 80 and 120 kg ha-1) and Zn (0, 2.5, 5.0 and 7.5 kg ha-1) were used as treatments while in T. Aman season, doses of N were 0, 30, 60 and 90 kg ha-1 and the residual effects of Zn were studied. A flat dose of P K S @15-50-10 kg ha-1 was applied. The experiment was laid out in a RCB (2-factorial) design with three replications. The result showed that application of Zn and N significantly increased grain yield, Zn concentration in the grain and total Zn uptake of the rice varieties. In Boro season, the highest grain yield was obtained when 120 kg ha-1 N was applied along with 7.5 kg ha-1 Zn, where as in T. Aman season the highest grain yield was found in 90 kg ha-1 N with 2.5 kg ha-1 Zn treatment. In general, it may be concluded that application of Zn in calcareous soil along with N significantly increased yield of HYV rice.

Keywords: Zinc, Nitrogen, Interaction, HYV Rice, Calcareous Soil

Location: Bangladesh Rice Research Institute (BRRI) regional station farm, Rajshahi

Start Date: 00-00-2008

End Date: 00-00-2009

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To examine the nature of the interaction between Zn and N in rice crops as it is a major crop in Bangladesh.

Methodology:

The field experiment was conducted in Boro and T. Aman seasons during 2008-09 at the Bangladesh Rice Research Institute (BRRI) regional station farm, Rajshahi (AEZ-11, land type-high land (HL)). The soil of the experimental field was silty-clay-loam with pH=7.7. Organic C, total N, available P, exchangeable K and available S of the soil was 1.2 %, 0.13%, 15.0 mg kg-1, 0.18 meq /100 g soil and 11.8 mg kg-1, respectively. The available Zn (EDTA extracted) of the soil was 1.23 mg kg-1. In Boro season, four doses of N ie 0, 40, 80, 120 kg ha-1 and four doses of Zn ie 0, 2.5, 5.0, 7.5 kg ha-1 were imposed as treatment. In T. Aman season, four doses of N ie 0, 30, 60, 90 kg ha-1 and the residual effect of previous applied Zn doses were observed. The experiment was laid out in a RCB (2-factorial) design with three replications. Each plot received a blanket dose of P, K and S at the rate of 15-50-10 kg ha-1, respectively. BRRI dhan45 and BRRI dhan49 were used as test variety in Boro and T. Aman season respectively. Forty-five-day-old (Boro) and 30-day-old (T. Aman) seedlings of each variety were transplanted at 20- × 20-cm spacing. Full doses of Zn as ZnSO₄. 7H₂O and other non-urea fertilizers were applied as basal during final land preparation. Nitrogen from urea was applied in three equal splits (1/3 as basal + 1/3 at active tillering stage + 1/3 at 5-7 days before panicle initiation stage). Necessary intercultural operations were done as required. At maturity, the crop was harvested from 5 m2 areas at the centre part of each plot and 16 hills were collected for straw yield. The grain yield was recorded at 14% moisture content and straw yield as oven dry basis. The plant samples (grain and straw) were digested with di-acid mixture (nitric and perchloric acid at the rate of 5:2) for the determination of Zn and with H₂SO₄ for the determination of N. The Zn was determined on an atomic absorption spectrophotometer and N by micro-Kjeldahl method (Yoshida et al, 1976). Data were analyzed as per standard statistical procedure (IRRI, 1998).

Source of Information: Bangladesh Rice J. 16(1):41-46, June 2012 ISSN 1025-7330

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

It may be concluded that in calcareous soil the significant highest grain yield was obtained with the treatment N120 × Zn7.5 in Boro season and with the treatment N90 × Zn2.5 in T. Aman season. The application of N and increasing level of Zn had a synergistic effect on grain Zn concentration both in Boro and T. Aman seasons. The grain N concentration remained unchanged due to the application of Zn. The application of N and Zn had synergistic effect on both total Zn and N uptake.

Knowledge Management: Journal