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Zinc and Nitrogen Interaction in Mvs Rice Grown in Calcareous Soil

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

Masuda Akter
Senior Scientific Officer
Soil Science Division, BRRI Gazipur

M. Mozammel Haque
Senior Scientific Officer
Soil Science Division, BRRI Gazipur

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

Abstract/ Executive Summary:

Objective of this study was to examine the nature of the interaction between Zn and N in rice. The field experiment was conducted in Boro and T. Aman seasons at the Bangladesh Rice Research Institute (BRRI) Regional Station Farm, Rajshahi (AEZ-11, land type-high land (HL)). In calcareous soil, Boro rice yield may be increased with the application of N and Zn @ 120 and 7.5 kg/ha but in T. Aman the rate will be 90 and 2.5 kg/ha.

Keywords: Zinc, Nitrogen, Calcareous soil

Location: Bangladesh Rice Research Institute (BRRI) Regional Station Farm, Rajshahi

Start Date: 01-07-2009

End Date: 31-06-2010

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To examine the nature of the interaction between Zn and N in rice.

Methodology:

The field experiment was conducted in Boro and T. Aman seasons 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 i.e. 0, 40, 80, 120 kg ha-1 and four doses of Zn i.e. 0, 2.5, 5.0, 7.5 kg ha-1 were imposed as treatment. In T. Aman season, four doses of N i.e. 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 days (Boro) and 30 days (T. Aman) old seedlings of each variety were transplanted at 20 cm × 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.

Source of Information: Proceedings of BRRI Annual Internal Review for 2009- 2010

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Application of Zn increased N fertilizer use efficiency. The interaction effect of N and Zn on the grain yield of Boro rice was highly significant (p<0.01). It is clearly shown that the result of the interaction effect of N and Zn on grain yield was inconclusive at 0 and lower level of N (even up to 80 kg N ha^-1). The concentration of Zn in grain of Boro rice increased significantly with the increasing levels of Zn. In the absence of added N, the Zn concentration in grain of Boro rice increased significantly with increasing levels of Zn. Similar trend was also found in the presence of added N @ 80 kg N ha-1. In case of added N @ 80 kg N ha^-1, it increased significantly up to 5 kg Zn ha^-1. The concentration of N in grain remained unchanged due to the addition of Zn. But there was a tendency of depression of N concentration in the presence of Zn. However, the application of Zn @ 5 kg Zn ha^-1 decreased the N concentration in grain significantly in the presence of added N 120 kg ha^-1. Similarly, the application of Zn @ 2.5 kg Zn ha^-1 decreased the N concentration in straw significantly in the presence of all levels of added N The interaction effect of residual Zn and direct N on the grain and straw yield of T. Aman rice (BRRI dhan49) was highly significant (p<0.05). It is clearly shown that the significantly highest grain yield of 4.90 t ha^-1 was obtained with the treatment N90 ×Zn 2.5. Addition of 5.0 and 7.5 kg Zn ha^-1 had a depressing effect. The concentration of Zn in grain of T. Aman rice increased significantly with the increasing levels of Zn both in the absence and presence of added N.

Knowledge Management: Report/Proceedings