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

M. Sajidur Rahman
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 determine the optimum and economic dose of P fertilizer for different BRRI MVs and hybrid entries in a rice–rice cropping pattern. The experiment was conducted at the Bangladesh Rice Research Institute farm, Gazipur on Chhiata clay loam soil. 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

Keywords: P response, Hybrid rice, Cropping pattern.

Location: BRRI experimental farm, Gazipur

Start Date: 01-07-2009

End Date: 30-06-2010

Program Area: Variety and Species

Commodity: Fertilizer

Objectives:

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 dhan49, BRRIdhan7155 and two hybrid entries i.e. EH3 and EH4 were tested in T.Aman season but in Boro season BRRI dhan45, BRRI dhan50 and hybrid entries EH5 and EH6 were tested in the experiment. At maturity, the crop was harvested and the grain yield was recorded at 14% moisture content and straw yield as oven dry basis.

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 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 P response was observed among the P rates. In T.Aman, application of P @ 5 kg/ha significantly increased the grain yield in all varieties except EH3. The effect of P @ 20 and 30 kg P/ha, remained stable. Straw yield increased with increasing P application but it was not statistically significant. Regression analysis in T.Aman and Boro rice the estimated function between P rates and grain yield was quadratic in most of the varieties.

Knowledge Management: Report/Proceedings