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Contribution of Rice Straw to Potassium Supply in Rice Fallow-rice Cropping Pattern

P. K. SAHA
Principal Scientific Officer
Soil Science Division, BRRI, Joydebpur, Gazipur 1701

M.A. M. MIAH
Chief Scientific Officer
Soil Science Division, BRRI, Joydebpur, Gazipur 1701

A. T. M. S. HOSSAIN
Scientific Officer
Soil Science Division, BRRI, Gazipur 1701

F. RAHMAN
Scientific Officer
Soil Science Division, BRRI, Gazipur 1701

M. A. SALEQUE
Principal Scientific Officer
Soil Science Division, BRRI, Joydebpur, Gazipur 1701

Abstract/ Executive Summary:

A field experiment was conducted through 2001-2004 at the Bangladesh Rice Research Institute (BRRI), Gazipur Farm with a view to determining the contribution of rice straw to K supply and K-use efficiency for the next crop in Rice-Fallow-Rice cropping pattern. Two levels of chemical potassium-0 (K₀) and 66 kg K/ha (K₆₆) from muriate of potash (MoP)- were tested with or without straw incorporation. Results showed that the use of K either from inorganic fertilizer or from rice straw increased the plant height, panicles/m² , grain and straw yields of rice in both Boro and T. Aman seasons. However, the effect of K was more distinct in Boro season. On an average, 1.33 t/ha yield benefit of Boro rice was obtained with rice straw incorporation in K₀ plot. Application of K significantly increased the total K and P uptake of rice crops. Agronomic efficiency, partial factor productivity and physiological efficiency of K decreased with the increasing K level regardless of K sources in Boro season. Potassium replenishment through chemical fertilizer was not sufficient to balance K. However, incorporation of rice straw showed a positive K balance. Positive perceptible changes in soil characteristics and soil nutrient status (N, P and K) were observed due to K fertilization either from inorganic (MoP) or from organic sources.

Keywords: Contribution of rice straw , Potassum supply , Rice-Fallow-Rice cropping pattern

Location: BRRI Farm, Gazipur

Start Date:

End Date:

Program Area: Crop-Soil-Water Management

Commodity: Rice

Objectives:

To determine the contribution of rice straw to K supply and K use efficiency for the next crop and finally the yield of rice.

Methodology:

The experiment was initiated in Boro 2001 at the BRRI Farm, Gazipur (AEZ-28, land type - MHL) and was continued up to 2004. During the four years of experiment, four Boro and four T. Aman crops were grown. The following four treatments were tested in all seasons throughout the experimental period: T₁ K0 (Straw removed); T₂ K 66 (Straw removed); T₃= K0 (Straw retained) and T₄=K66 (Straw retained). The straw yielded in Boro and T. Aman seasons was added to the successive T. Aman and Boro crops, respectively in T₃= K0 (Straw retained) and T₄=K66 (Straw retained) treatments in situ. About 5.85 and 6.58 t/ha Boro rice straw ((average of four years (2001-2004)) as oven dry basis was added to the soil in treatment T₃= K0 (Straw retained) and T₄=K66 (Straw retained), respectively in T. Aman season. In Boro season, about 5.0 t/ha T. Aman rice straw (average of three years (2001-2003)) as oven dry basis was added to the soil in both treatments T₃= K0 (Straw retained) and T₄=K66 (Straw retained). BRRI dhan29 in Boro and BRRI dhan39 in T. Aman were tested. Nitrogen fertilizer was applied into 3 splits: 1/3 ^rd as basal, 1/3rd at active tillering stage and the rest 113 rd at 7 days before panicle initiation stage. All other fertilizers (PKS) were applied at final land preparation . At maturity, plant height, number of panicles and straw yield were recorded from 16 hills. The crop was harvested from 5 m² area at the centre of each plot and the grain yield was adjusted at 14 % moisture content.

Source of Information: Bangladesh J. Agril. Res. 34(4) : 633-643, December 2009

Article Link (Online Journal):

Funding Source:

Total Budget (Tk.) :

Achievement/Findings:

Results showed that the use of K either from inorganic fertilizer or from rice straw increased the plant height, panicles/m² , grain and straw yields of rice in both Boro and T. Aman seasons. However, the effect of K was more distinct in Boro season. On an average, 1.33 t/ha yield benefit of Boro rice was obtained with rice straw incorporation in K₀ plot. Application of K significantly increased the total K and P uptake of rice crops. Agronomic efficiency, partial factor productivity and physiological efficiency of K decreased with the increasing K level regardless of K sources in Boro season. Potassium replenishment through chemical fertilizer was not sufficient to balance K. However, incorporation of rice straw showed a positive K balance. Positive perceptible changes in soil characteristics and soil nutrient status (N, P and K) were observed due to K fertilization either from inorganic (MoP) or from organic sources.

Knowledge Management: Journal