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Effect of Continuous Wetland Intensive Rice Cropping on Sustainable Soil Fertility and Productivity

M. Nayeem Ahmed
Scientific Officer
Soil Science Division, BRRI, Gazipur

M. Imran Ullah Sarker
Scientific Officer
Soil Science Division, BRRI, Gazipur

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

A. Latif Shah
Cheif Scientific Officer
Soil Science Division, BRRI, Gazipur

Abstract/ Executive Summary:

Objective of this study was to evaluate the consequences of intensive cropping under continuous wet land condition and to monitor soil fertility changes over time. 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 keeping the soil perpetually wet. In 1982, the field was divided into two sub-plots, one plot received the previous NPK dose and the other plot was maintained as fertilizer control. The reverse nutrients management may have the capability to produce optimum rice yield if the crop is fertilized with balanced fertilizer.

Keywords: INM, Missing of macro nutrients

Location: BRRI experimental farm, Gazipur

Start Date: 01-07-2012

End Date: 30-06-2013

Program Area: Crop-Soil-Water Management

Commodity: Soil fertility

Objectives:

To evaluate the consequences of intensive cropping under continuous wet land condition and to monitor soil fertility changes 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 keeping the soil perpetually wet. In 1982, the field was divided into two sub-plots, one plot received the previous NPK dose and the other plot was maintained as fertilizer control. In 1984, the NPK treatment was modified with the inclusion of S as gypsum because of S deficiency confirmed through soil-plant analysis and green house studies. From 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 in T.Aus, T.Aman and Boro seasons are BRRI dhan48, BRRIdhan46 and BRRI dhan50, respectively. The NPK doses 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 the rate of 10, 4 and 1 kg/ha in Boro season only. This experiment is non-replicated.

Source of Information: Proceedings of the BRRI Annual Internal Review for 2012- 2013

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The annual rice production in the unfertilized plot decreased from 6.41 t/ha in 1981 to less than 2 t/ha in 2008, a total of 28 years of continuous cropping. However, the yield in this treatment is showing an increasing tendency since the last four years (2.7- 3.8 t/ha). In contrast, the yield trend in NPKS treatment over the last 32 years showed little bit increasing tendency as of 1981. The yield of control plot ranged from 1.95 to 2.29 t/ha irrespective of season and annual yield production was 6.29 t/ha/yr during 2011-12. On the other hand, its reversed management i.e. addition of complete fertilizer (NPKSZnCu) yielded (12.9 t/ha/yr) equivalent to complete fertilizer treatment (12.43 t/ha/yr). It indicates that the soil has capability to produce optimum yield when it receives balanced fertilizer. From the Table 35, it is observed that the application of Zn and Cu (Cu was applied since 2000) decreased annual yield compared to NPKS treatment.

Knowledge Management: Report/Proceedings