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

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

Masuda Akter
Senior Scientific Officer
Soil Science Division, BRRI Gazipur

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

Abstract/ Executive Summary:

Optimum rates of BRRI dhan49, BR7155-20-1-3, EH3 and EH4 are 80, 65, 60 and 30 kg K/ha, respectively. Economic rates of BRRI dhan49, BR7155-20-1-3, EH3 and EH4 are 80, 60, 20 and 20 kg K/ha, respectively. Optimum rates of BRRI dhan45, BRRI dhan50, EH5 and EH6 are 50, 60, 80 and 80 kg K/ha, respectively. Economic rates of BRRI dhan45, BRRI dhan50, EH5 and EH6 are 20, 40, 80 and 80 kg K/ha, respectively

Keywords: K response, Hybrid rice, MVs

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 K response behavior of BRRI MVs and Hybrid rice in a rice-fallow-rice cropping pattern

Methodology:

This experiment was conducted in both T. Aman and Boro seasons at the BRRI farm, Gazipur (AEZ-28, land type -MHL). The soil of the experimental field was clay-loam in texture and slightly acidic in reaction (pH 5.7). Organic C, total N, available P and exchangeable K of the soil was 0.72%, 0.07%, 9.29 ppm and 0.18 meq/100 g soil, respectively. The available S and Zn (EDTA extracted) of the soil were 5.39 ppm and 3.65 ppm, respectively Five doses of K i.e. 0, 20, 40, 60 and 80 kg/ha were imposed as treatment. The design of the experiment was split-plot. Potassium doses were assigned in the main plot and the varieties in the sub- plot. Each plot received a blanket dose of N, P, S and Zn at the rate of 145-25-24-0 kg/ha as STB in Boro and 97-15-14-0 kg/ha in T. Aman season, respectively. BRRI dhan49, BR7155-20-1-3 and two hybrid entries EH3 and EH4 were used in T.Aman season, and BRRI dhan45, BRRI dhan50 and two hybrid entries EH5 and EH6 were also tested in Boro season. At maturity, the crop was harvested from 5 m² areas at the centre 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 BRRI Annual Internal Review for 2009- 2010

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

During T. Aman 2009, application of K fertilizer significantly increased the grain yield of all tested genotypes. Increasing K level up to 20 kg/ha increased the grain yield of rice hybrid entry EH3, up to 60 kg/ha the grain yield of EH4, and up to 80 kg/ha the grain yield of BRRI dhan49 and BR7155-20-1-3. In K0 plot (native soil K condition) BRRI dhan49 and EH4 produced the higher yield of 3.13 and 3.36 t/ha, respectively. During Boro 2009-10, application of K fertilizer significantly increased the grain yield of all tested genotypes. Increasing K level up to 20 kg/ha increased the grain yield of BRRI dhan45, up to 40 kg/ha the grain yield of BRRI dhan50, up to 60 kg/ha the grain yield of EH5. EH6 responded up to 80 kg K/ha. In native soil K condition, EH5 produced the highest grain yield of 3.50 t/ha, which was significantly higher than that of BRRI dhan50. Varietals characteristics itself the causes of yield differences among those varieties. A positive but quadratic relationship was observed between the yield of MVs and hybrid entries and added K fertilizers. The response of grain yield to K application was very distinct for both the T.Aman and Boro season.Regression analysis indicated that the estimated response function between K rates and grain yield for all the values were quadratic in nature. The value of R2 (Coefficient of determination) was significant in all the varieties.

Knowledge Management: Report/Proceedings