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Zinc and Nitrogen Interaction in Boro Rice Grown in Calcareous Soil

Pranesh Kumar Saha
Principle Scientific Officer
Soil Science Division, BRRI Gazipur

Masuda Akhter
Senior Scientific Officer
Soil Science Division, BRRI Gazipur

S. Kaiser Zaman
Chief Scientific Officer
Soil Science Division, BRRI Gazipur

Abstract/ Executive Summary:

The interaction effect of N and Zn on the grain yield of Boro rice (BRRI dhan45) was highly significant (p<0.01). It is clear that at 0 and lower level of N (even up to 80 kg N/ha) the result of the interaction effect of N and Zn on the grain yield was inconclusive. The conclusive result was found only at the higher rate of N i.e. at 120 kg N/ha level. The significantly highest grain yield of 6.09 t/ha was produced with the treatment N120 × Zn 7.5. The interaction effect of N and Zn on the straw yield of Boro rice (BRRI dhan45) was not significant (p= 0.257). The interaction effect of N and Zn on the total N and Zn uptake of BRRI dhan45 was significant (p=0.044 and p<0.01, respectively). It is found that the significantly highest N uptake of 75.7 kg/ha was obtained with the treatment N80 × Zn 5. It was identical to that of the interaction of N120 and all levels of Zn (0-7.5). The significantly highest Zn uptake of 2.61 kg/ha was obtained with the treatment N120 × Zn 2.5 followed by the treatment N120 × Zn 7.5 (2.45 kg/ha). These treatments were identical.

Keywords: Zinc, Nitrogen interaction, Boro rice, Calcareous soil

Location: BRRI R/S Farm, Rajshahi (AEZ-11, land type-HL).

Start Date: 01-07-2008

End Date: 30-06-2009

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

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

Methodology:

This experiment was conducted in Boro season 2008-09 at the BRRI R/S Farm, Rajshahi (AEZ-11, land type-HL). The soil of the experimental field was silty-clay-loam with pH=7.7. Organic C, total N, available P and exchangeable K of the soil was 1.2%, 0.13%, 46 ppm and 0.18 meq /100 g soil, respectively. The available S and Zn (EDTA extracted) of the soil were 11.8 ppm and 1.23 ppm, respectively. Four doses of N i.e. 0, 40, 80, 120 kg /ha and four doses of Zn i.e. 0, 2.5, 5.0, 7.5 kg/ha were imposed as treatment. 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, respectively. BRRI dhan45 was used as test variety. 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. Nitrogen and Zn content from plant samples were determined by the standard analytical procedure. It may be concluded that higher grain yield of Boro rice was produced N and Zn @ 120 and 7.5kg/ha in calcareous soil with a blanket dose of P K S @ 15-50-10 kg/ha, respectively.

Source of Information: Proceedings of BRRI Annual Internal Research Review, 2008- 2009

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Application of 7.5 kg/ha Zn along with 120 kg N/ha gave the highest yield (6.09 t/ha) and the highest Zn uptake in rice at the BRRI Regional Station, Rajshahi.

Knowledge Management: Report/Proceedings