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Response of Mvs and Hybrid Entries to Added Phosphorus in Rice–rice Cropping Pattern

Md. Sajidur Rahman
Senior Scientific officer
Soil Science Division, BRRI Gazipur

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

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

Abstract/ Executive Summary:

Application of P rates did not influence grain yield irrespective of varieties in soils having 6 mg P kg^-1 soil during T.Aman season,while in the same field during Boro season significant P response was observed up to 20 kg P/ha. Application of P @ 10 kg/ha significantly increased the grain yield. But when P was applied @ 20 and 30 kg P/ha, the grain yield difference was not statistically significant. However, the increasing trend up to 20 kg P/ha was found very remarkable. The straw yield increased with increasing P application up to 10 kg P/ha in T. Aman and 5 kg P/ha in Boro. Regression analysis in T.Aman and Boro rice the estimated function between P rates and grain yield was quadratic.

Keywords: Rice, Phosphorus, Economic dose, BRRI varieties

Location: Bangladesh Rice Research Institute farm, Gazipur

Start Date: 1-7- 2008

End Date: 30-6- 2009

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

1. to determine the optimum and economic dose of P fertilizer for different BRRI MVs and hybrid entries in a rice – rice cropping pattern.

Methodology:

The experiment was conducted at the Bangladesh Rice Research Institute farm, Gazipur on Chhiata clay loam soil (hyperthermic Vertic Endoaquept). The soil has pH 5.92, organic C 0.82 %, total N 0.08%, available P 6 mg kg-1, and exchangeable K 0.26 cmolc kg^-1. Five doses of P i.e 0, 5, 10, 20 and 30 kg ha^-1 were imposed as treatment. The design of the experiment was split-plot with fertilizer in the main plot and variety in the sub-plot. Each plot received a flat dose of 145 kg N, 50 kg K and 10 kg S ha^-1 as STB in Boro season and 70 kg N, 50 kg K and 10 kg S ha^-1 in T.Aman season respectively. BRRI dhan30, BRRI dhan49 and two hybrid entries i.e. EH1 and EH2 were tested in T.Aman season but in Boro season BRRI dhan28, BRRI dhan29, BRRI dhan36, and BRRI dhan45 were tested in the experiment. Urea N was applied in three 3 equal splits i.e 1/3 N at final land preparation, 1/3 N at active tillering stage and rest 1/3 N at 5-7 days before PI stage. Phosphorus, K and S fertilizers were applied at final land preparation. The unit plot size was 6 m X 6.5 m. Forty day old seedlings were transplanted using 2-3 seedlings/hill. Plant protection measures were taken whenever required. At maturity, the crop was harvested 5 m2 area at the centre 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. Phosphorus content from plant samples were determined by standard analytical procedure.

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

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Soils having available P (modified Olsen method) around 6 mg/kg might be sufficient in T. Aman but in Boro season application of P @ 15 kg/ha appeared sufficient to produce optimum rice yield. Application of P @ 30 kg/ha in Boro rice sufficient amount of P remains in soil. So that no needs to apply P in T. Aman season.

Knowledge Management: Report/Proceedings