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Performance of Mvs and Hybrid Entries on Phosphorus Deficient Soil

A.T.M. Sakhawat Hossain
Senior Scientific Officer
Soil Science Division, BRRI Gazipur

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

Abdul Latif Shah
Cheif 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) in low soil P condition. Available soil P ranges were 5.50 ± 0.82 ppm, 5.95 ± 0.88 ppm, 6.75 ± 0.61 ppm, 8.62 ± 2.13 ppm and 9.74 ± 1.36 during T. Aman season, while, in Boro it ranges from 2.64 ± 0.88, 5.31 ± 0.67, 7.39 ± 0.70, 13.13 ± 1.50 and 15.26 ± 0.75. In T. Aman season soil available P did not influence rice yield. The prevailing high temperature during T. Aman rice growing period may increase P availability to fulfill crop requirement. BRRI dhan30 indicating its varietal capability to extract more inherent soil P absorption capacity or high P use efficiency. In Boro season, EH1 and EH2 gave significantly higher grain yield than MVs at higher soil P level. In T. Aman season, the highest P uptake was observed in EH2 where soil P level was 9.74 ppm. Relatively higher P uptake was found in EH2 followed by EH1 and inbreeds. It was clearly indicated that at higher P levels during Boro seasons hybrid entries may utilize more P efficiently than inbred varieties. But in T. Aman season the response of rice varieties in P deficient level was insignificant.

Keywords: Low soil P, Hybrid rice, P uptake, P use efficiency

Location: BRRI farm, Gazipur

Start Date: 00-00-2007

End Date: 00-00-2008

Program Area: Variety and Species

Commodity: Fertilizer

Objectives:

To select the rice varieties/advanced lines tolerant to low available soil P

Methodology:

The experiment was initiated in T. Aman 2007 and Boro 2007-08 at BRRI farm Gazipur at varying inherent soil P levels. 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. Among 15 plots, three plots of similar soil available P levels were considered as three replications. Available P ranges of the five main-plots were, 5.50 ± 0.82 ppm, 5.95 ± 0.88 ppm, 6.75 ± 0.61 ppm, 8.62 ± 2.13 ppm and 9.74 ± 1.36 during T. Aman season. In each main plot 4 varieties (BRRI dhan30, BRRI dhan49, EH1 and EH2) were planted having an area of 4 m x 1.5 m. In the Boro season soil P level were, 2.64 ± 0.88, 5.31 ± 0.67, 7.39 ± 0.70, 13.13 ± 1.50 and 15.26 ± 0.75 and tested variety were BRRI dhan36, BRRI dhan45, EH1 and EH2. Each plot received a flat dose of NKS as STB recommendation. 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:

In T. Aman season soil available P did not influence rice yield even in very low P condition. The prevailing high temperature during T. Aman rice growing period may increase P availability to fulfill crop requirement. BRRI dhan30 indicating its varietal capability to extract more inherent soil P absorption capacity or high P use efficiency. In Boro season, EH1 and EH2 gave significantly higher grain yield than MVs at higher soil P level. In T. Aman season, the highest P uptake (16 kg/ha) was observed in EH2 where soil P level was 9.74 ppm and lowest P uptake (5 kg/ha) was found in BRRI dhan30, where soil P level was 5.5 ppm. Relatively higher P uptake was found in EH2 followed by EH1 and inbreeds. It was clearly indicated that at higher P levels during Boro seasons hybrid entries may utilize more P efficiently than inbred varieties. But in T. Aman season the response of rice varieties in P deficient level was insignificant.

Knowledge Management: Report/Proceedings