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Study on the Consequences of Continuous Wetland Intensive Rice Cropping on Sustainable Soil Fertility and Productivity (year 2007-08).

Abdul Latif Shah
Cheif Scientific Officer
Soil Science Division, BRRI Gazipur

Masuda Akter
Scientific Officer
Soil Science Division, BRRI Gazipur

Md. Abdul Mazid Miah
Cheif Scientific Officer
Soil Science Division, BRRI Gazipur

Abstract/ Executive Summary:

Long term study (since 1971) was performed at BRRI farm Gazipur in a permanent layout to evaluate the consequences of intensive cropping under continuous wet land conditions on soil fertility over time. Experiment accommodated six treatments viz. control (native nutrient), reverse control (NPKSZnCu), NPK, NPKS, NPKSZn and NPKSZnCu. The varieties tested in T. Aus, T. Aman and Boro seasons were BRRI dhan26, BRRI dhan32 and BRRI dhan28, respectively. The annual rice production decreased over time in unfertilized soil under perpetual wet conditions and the grain yield production decreased it about 1 t/ha after 27 years. In contrast, continuous NPKS fertilizer application over this exhibited slightly increasing trend of grain yield production in a rice-rice-rice cropping pattern. Application of Cu positively influenced the grain yield of rice and emerging as a sixth yield limiting nutrient factor for rice in continuously wetland conditions. The reverse nutrient management in grain yield production reveled that every soil resembling the experimental site may have the capability to produce optimum yield in balanced fertilized condition.

Keywords: Wetland, Continuous cropping, Rice

Location: BRRI farm, Gazipur

Start Date: 01-07-2007

End Date: 30-06-2008

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility

Objectives:

To evaluate the consequences of intensive cropping under continuous wet land conditions on soil fertility over time

Methodology:

This experiment was initiated in 1971 in a permanent layout with an objective to grow three rice crops (Boro, T. Aus and T. Aman) annually with NPK fertilizer application. In 1982, the field was divided into two sub-plots, one part receiving NPK dose and the other no fertilizer. In 1984, NPK treatment was modified with the inclusion of S as gypsum because of its deficiency was confirmed through soil-plant analysis. In 1991, the plot was again divided into five sub-plots to accommodate two N levels with and without S fertilizer comprising 4 treatments with an absolute control. Since Boro 2000, the experiment was modified to accommodate six treatments viz. control (native nutrient), reverse control (NPKSZnCu), NPK, NPKS, NPKSZn and NPKSZnCu. The varieties tested were in T. Aus, BR1 & BR26, BRRI dhan31 & BRRI dhan39 in T. Aman and BRRI dhan 28 & BRRI dhan 29 in Boro season, respectively. The NPK doses used were 140-25-80, 60-15-80 and 60-10-60 kg/ha for Boro, T. Aman and T. Aus respectively. Sulfur, Zn and Cu were applied at 10, 4 and 1 kg/ha in Boro season only. This is a non-replicated trial.

Source of Information: Proceedings of the BRRI Annual Internal Review, 2007-2008

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The annual rice production decreased over time in unfertilized soil under perpetual wet conditions and the grain yield production decreased it about 1 t/ha after 27 years. In contrast, continuous NPKS fertilizer application over this exhibited slightly increasing trend of grain yield production in a rice-rice-rice cropping pattern. Application of Cu positively influenced the grain yield of rice and emerging as a sixth yield limiting nutrient factor for rice in continuously wetland conditions. The reverse nutrient management in grain yield production reveled that every soil resembling the experimental site may have the capability to produce optimum yield in balanced fertilized condition.

Knowledge Management: Report/Proceedings