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Response of Mv and Hybrid Entries to Added P in Rice-rice Cropping Pattern

Md. Rafiqul Islam
Principal Scientific Officer
Soil Science Division, BRRI Gazipur

M. Abdul Mazid Miah
Chief Scientific Officer
Soil Science Division, BRRI Gazipur

Abstract/ Executive Summary:

The experiment was initiated in T Aman 2007 and Boro 2007-08 at BRRI farm Gazipur to determine the P response behavior of MVs (BRRI dhan30 and BRRI dhan 49 in T. Aman, and BRRI dhan36, BRRI dhan45 in Boro season) and Hybrid rice (EH1 and EH2) with five P fertilizers doses viz 0, 5, 10, 20 and 30 kg/ha. Application of P rates did not influence grain yield irrespective of genotypes in soils having 6 mg P per kg soil during T. Aman season, while in the Boro season, P response observed among the P rates. Application of P @10 kg/ha significantly increased grain yield. But when P was applied @ 20 and 30 kg P/ha, the grain yield difference was insignificant. Estimated function between P rates and grain yield was quadratic in nature and R²was significant. Optimum and economic doses of P for T.Aman was 20 kg /ha, while at Boro season optimum was 22 kg P/ha but economic dose was 30 kg P. The uptake of P was more in EH1 and EH2 compared to MVs. A negative apparent P balance was observed when P was applied @ 10 kg/ha. A significant P remains in soil if P was applied @30 kg/ha. It is indicated that in rice-rice cropping pattern, if 30 kg P/ha was applied in Boro season, thre is no need to apply P in T. Aman rice.

Keywords: P uptake, P use efficiency, Hybrid rice, Cropping pattern

Location: BRRI farm, Gazipur

Start Date: 00-00-2007

End Date: 00-00-2008

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To determine the optimum and economic dose of P fertilizer for different MVs and Hybrid rice varieties

Methodology:

The experiment was initiated in T. Aman 2007 and Boro 2007-08 at BRRI farm Gazipur in a clay loam soil. Soil pH of the experimental field was 5.92, organic carbon 0.82%, total N 0.08%, available P 6 mg/kg and exchangeable K 0.26 cmol_c/kg soil. Five P fertilizers doses- 0, 5, 10, 20, and 30 kg/ha were tested. The design of experiment was split plot having P fertilizer in the main plot and variety in the sub plot. The treatments were repeated thrice. Each plot received a flat dose of NKS as STB recommendation. In T. Aman season, BRRI dhan30 and BRRI dhan 49 and two hybrid entries (EH1 and EH2) were tested. In the Boro season, BRRI dhan36, BRRI dhan45 and the same hybrid entries were tested. The unit plot size was 6 m x 6.5 m. Urea-N was applied in three 3 equal splits at final land preparation, at active tillering stage and at 5-7 days before PI stage. Grain yield was recorded from 5 m² areas at the center 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.

Source of Information: Proceedings of the BRRI Annual Internal Review, 2007-08

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 remains sufficient amount of P in soil. So there was no need to apply P in the next T. Aman season.

Knowledge Management: Report/Proceedings