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Evaluation of Rice Genotypes Under Variable Soil Available Phosphorus Levels in T. Aman 2009

M. Abu Saleque
Principal Scientific Officer
Soil Science Division, BRRI Gazipur

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

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

Abstract/ Executive Summary:

In T. Aman, at low soil P, BR7155-20-1-3, BR11 and BR7870-5(Nils)-7-HR1 showed 16 – 19% yield reduction due P deficiency however at boro season, BR6926-1-1-1-3-2 was found a low yielding genotype, but responsive to P deficiency

Keywords: P deficiency, Promising lines, P response.

Location: BRRI experimental farm, Gazipur

Start Date: 01-07-2009

End Date: 30-06-2010

Program Area: Crop-Soil-Water Management

Commodity: Fertilizer

Objectives:

To evaluate rice genotypes under variable soil available phosphorus.

Methodology:

Field experiment was conducted in the permanent layout of the long-term phosphorus management experimental field. Due to variable phosphorus management for last 23 years, the experimental field had three levels of available phosphorus containing plots- <5.5 (low P), 6–7 (medium P) and > 8 ppm (high P). Fourteen rice genotypes – BR7155-20-1-3, BR7870-5(Nils)-7-HR1, BR6929-1-1-1-1-2, BR6926-3-1-3-1-4, BR6926-3-7-12-2-2, BR6926-1-1-1-3-2, BR7870-5*(Nils)-10-HR3, BR6922-4-4-4, BR6944-42-4-2-8-2, BRRI dhan37, BRRI dhan49, BR11, Gutiswarna, and Kataribhog were tested. The objective of the experiment was to evaluate these genotypes to under variable soil available phosphorus. The unit plot size was 3 rows × 5 m. The plots under different P levels were 9 in low P, 3 in medium P and 12 in high P. Forty-day-old rice seedling were transplanted. Each plot received 80 kg N, 50 kg K and 10 kg S/ha from urea, muriate of potash and gypsum.

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:

The tested genotype BR7155-20-1-3 gave the highest yield at all the three soil P levels followed by BR11 and BR7870-5(Nils)-7-HR1. At the high soil P level, the BR7155-20-1-3, BR11 and BR7870-5(Nils)-7-HR1 gave 5.83, 4.85 and 4.44 t/ha, respectively. At medium soil P level these genotypes yielded 5.15, 4.49 and 4.30 t/ha, respectively and 4.74, 4.09 and 3.72 t/ha, respectively, at low P soil. BR7155-20-1-3, BR11 and BR7870-5(Nils)-7-HR1 showed 16 – 19% yield reduction due P deficiency in T. Aman season. BR6929-1-1-1-1-2 gave 3.80 t/ha yield in the high P soil, while the yield of these genotype in medium and low P soil was 4.40 and 3.96 t/ha, respectively. Such non-responsive genotypes were Gutiswarna and BR6926-3-1-3-1-4. The popular Kataribhog variety had low yield (2.31 t/ha) and was not responsive to P deficiency. Other low yielding genotypes such as BR7870-5*(Nils)-10-HR3, BR6922-4-4-4, BRRI dhan49, BR6944-42-4-2-8-2 were poorly P responsive. However, BR6926-1-1-1-3-2 was found a low yielding genotype, but responsive to P deficiency.

Knowledge Management: Report/Proceedings