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Effect of K Rates on Grain Yield of BRRI Dhan49 and BRRI Dhan28

Md. Nazrul Islam
Scientific Officer
Soil Science Division, BRRI Gazipur

Aminul Islam
Principal Scientific Officer
Soil Science Division, BRRI Gazipur

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

Abstract/ Executive Summary:

The long term study (T. Aman, 26^th crop and Boro 27^th crop) was performed at BRRI farm Gazipur in a permanent layout to develop response curve and find out economic optimum dose of K for BRRI dhan49 and BRRI dhan28 in a rice–fallow–rice cropping pattern. In T. Aman and Boro season K rates were 0, 50, 100, 150 and 200 kg/ha. The study result showed, BRRI dhan49 produced maximum rice yield (4.80 t/ha) at 200 kg K/ha and BRRI dhan28 (5.63) at 150 kg K/ha. However, it were statistically similar with 50, 100, 150 and 200 kg/ha. After 10 years, the soil data showed the available K status in ranged from 0.19 to 0.22 cmol/kg. Boro rice plant removed more K from soil than T. Aman rice. At K₀, T. Aman rice absorbed 24 kg K/ha but Boro rice absorbed 47 kg K/ha. Increasing K rates significantly increased K absorption up to K₂₀₀. It may conclude that BRRI dhan49 produced the highest grain yield at 50 kg K/ha, while it was 100 kg K/ha for BRRI dhan28. Rice cultivation without K application created negative K balance in soil (-36 kg K/ha/year), while the highest K dose (200 kg K/ha) made positive K balance (155 kg K/ha/year).

Keywords: K balance, K uptake, Rice

Location: BRRI farm, Gazipur

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To develop K response curve of BRRI dhan49 and BRRI dhan28
To find out economic optimum dose of K in a rice–fallow–rice cropping pattern of Bangladesh.

Methodology:

The experiment was conducted in a long-term permanent layout of K response study both in T. Aman (26^th crop) and Boro seasons (27^th crop) at BRRI farm, Gazipur. The initial soil available K at surface layer was 0.18 cmol/kg at starting of the experiment in Boro 2003. After 10 years, the available K status in soil ranged from 0.19 to 0.22 cmol/kg. In T. Aman and Boro season K rates were 0, 50, 100, 150 and 200 kg/ha. The design of the experiment was RCB with three replications. Each plot received a blanket dose of NPS@ 145-25-24 kg/ha and 97-15-14 kg/ha in Boro and T. Aman seasons, respectively. The test varieties were BRRI dhan49 and BRRI dhan28 in T. Aman and Boro season.

Source of Information: Proceedings of the BRRI Annual Internal Review, 2013-14

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Significant yield and K uptake increases were observed at 50 kg K/ha than K control plots in both T. Aman and Boro season. In T. Aman, the highest grain yield (4.80 t/ha) was found at K₂₀₀, which was statistically similar with K₅₀, K₁₀₀ and K₁₅₀. The lowest grain yield (3.16 t/ha) was found with K control plot. In Boro, with the increase of K doses, grain yield increased up to K₁₅₀ then decreased. The highest grain yield (5.63 t/ha) was found in K₁₅₀, which was statistically similar with K₅₀ and K₁₀₀. The lowest grain yield (2.69 t/ha) was found with K control plots. Boro rice plant removed more K from soil than T. Aman rice. At K₀, T. Aman rice absorbed 24 kg K/ha but Boro rice absorbed 47 kg K/ha. Increasing K rates significantly increased K absorption up to K₂₀₀. Application of K improved apparent soil K balance. In K control plot, negative K balance (-36 kg K/ha/year) indicated its mining from soil. The balance gradually built up with increasing K level up to K₂₀₀. The highest positive K balance (155 kg K/ha/year) was found with the highest N level.

Knowledge Management: Report/Proceedings