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Evaluation of BRRI Dhan29 for Growth, Yield and P Uptake in 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

Abstract/ Executive Summary:

A field experiment was conducted in Boro 2013-14 at long term P deficient experimental field of Soil Science Division, BRRI, Gazipur to determine growth, yield and P uptake of BRRI dhan29 in P deficient soil. Four different ranges of inherent soil available P levels (below critical limit of 8.0 ppm) were T₁ = 1.5- 2.0 ppm, T₂ = 2.1- 2.5 ppm, T₃ = 2.6 – 3.0 ppm and T₄ = 3.1- 3.5 ppm considered as treatments. The study results showed, the highest level of soil P (3.1- 3.5 ppm) gave significantly the highest number of tiller and panicle, however, it was statistically similar with 2.6 - 3.0 ppm P. the highest grain yield 4.26 t/ha was obtained in 3.1- 3.5 ppm soil P. Among the four deficient soil P levels, the highest P uptake by grain was observed in 3.1- 3.5 ppm soil P followed by 2.6- 3.0 ppm. In may conclude that, BRRI dhan29 has potential capacity to produce 4.26 t/ha rice grain in P deficient soil (3.1-3.5 ppm P) which is below the critical P limit.

Keywords: Soil Phosphorus. Critical P level, BRRI dhan29

Location: BRRI farm, Gazipur

Start Date: 00-00-2013

End Date: 00-00-2014

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To determine growth, yield and P uptake by grain of BRRI dhan29 in deficient soil P conditions

Methodology:

A field experiment was conducted in Boro 2013-14 at long term experimental field of Soil Science Division, BRRI, Gazipur. The experimental plots having different available soil P were created by long time P application at different rates under rice-rice cropping systems. Four different ranges of inherent soil available P levels were considered are: T₁ = 1.5- 2.0 ppm, T₂ = 2.1- 2.5 ppm, T₃ = 2.6 – 3.0 ppm and T₄ = 3.1- 3.5 ppm which were below critical limit of 8.0 ppm. The experiment was conducted in RCB design with three replications. Other nutrients were applied as flat dose for BRRI dhan29 were 145-50-10-3 kg/ha of N-K-S-Zn, respectively. Rice was transplanted in 1^st week of January with 45 day-old seedlings and harvested in May. Grain yield was recorded at 14% moisture content and straw yield as oven dry basis. Thousand grain weights were also determined. Grain samples were analyzed for determining P content and uptake by grain.

Source of Information: Proceedings of the BRRI Annual Internal Review, 2013-2014

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Indigenous soil P levels significantly influenced tiller, panicle, grain and straw yields of BRRI dhan29. The lowest soil P level (1.5 - 2.0 ppm) produced 174 tiller/m²and tiller number which gradually increased to 240 with increasing soil P levels. The highest level of soil P (3.1- 3.5 ppm) gave significantly the highest tiller number, however, it was statistically similar with 2.6 - 3.0 ppm P. Panicle production had similar trend. Soil P levels also significantly increased 1000 grain weight and it varied from 19.19 g in lowest P level to 21.37 g in the highest P level. Grain yield ranged from 0.54 t/ha in 1.5-2.0 ppm P to 4.26 t/ha in 3.1-3.5 ppm P. Similar trend was observed for straw yield. Grain P content was only 0.080% in the lowest soil P level, which was significantly increased to 0.099% with the highest soil P levels. However, 2.6 - 3.0 ppm had statistically identical grain P content with highest treatment. Grain P uptake significantly increased with increasing soil P levels, which ranged from 0.43 to 4.22 kg/ha. Phosphorus uptake in lowest P level was only 0.43 kg/ha and increasing uptake with increased soil P level. Among four deficient soil P levels, the highest P uptake by grain was observed in 3.1- 3.5 ppm soil P followed by 2.6- 3.0 ppm soil P. BRRI dhan29 has potential capacity to produce 4.26 t/ha rice grain in P deficient soil (3.1-3.5 ppm P) which is below the critical P limit.

Knowledge Management: Report/Proceedings