Agricultural Research Management Information System

Home
Research Summary
Search
About Us
- ARMIS
- Brochure
Contact Us
Report
User Request
Data Input
Help
- Operation Manual
  - PDF
  - Video
- Program Area & Commodity
We have reached 37600 number of research entries at this moment.

- Logout

Research Detail

Home
Research
Detail

Effect of Continuous Wetland Intensive Rice Cropping

Masuda Akter
Senior Scientific Officer
Soil Science Division, BRRI Gazipur

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

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

Abstract/ Executive Summary:

Continuous triple rice cropping showed that the annual production of rice decreased overtime in fertilized plots and came down grain yield about 2.6 t/ha after 2.9 years. In contrast, NPKS fertilizer application over this time showed little bit increasing tendency or static position.

Keywords: INM, Triple cropping, Double cropping, Continuous wet land.

Location: BRRI experimental farm, Gazipur

Start Date: 01-07-2009

End Date: 30-06-2010

Program Area: Risk Management in Agriculture

Non-commodity: Flood

Objectives:

To harvest three rice crops per year with high yield target
To evaluate the consequences of intensive cropping under continuous wet land condition
To monitor soil fertility changes over time.

Methodology:

This study was initiated on a permanent layout in 1971. Since then three rice crops (Boro, T.Aus and T.Aman) had been grown with NPK dose (N120/80/80P25K35) for each crop keeping the soil perpetually wet. In 1982, the field was divided into two sub-plots and one plot received previous NPK dose and the other plot 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 also green house studies. The application of S brought about dramatic improvement in the growth and yield of rice. From the year 1991 the plot 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 treatments were modified again and experimental plots were redesigned and six treatments viz. control, reverse control (NPKSZnCu), NPK, NPKS, NPKSZn and NPKSZnCu were imposed. Two MV rice were tested in each cropping season; BRRI dhan42 & BRRI dhan48 in T.Aus, BRRIdhan46 & BRRIdhan49 in T.Aman and BRRI dhan29 & BRRI dhan50 in Boro season. 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. The experiment was maintained as non-replicated.

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:

The annual rice production decreased over time in unfertilized plot and came down grain yield about 2.6 t/ha after 29 years. In contrast, NPKS fertilizer application over this time showed little bit increasing tendency or maintain static position in rice yield as of 1981. Immediate and residual effect of S on grain yield was observed over NPK fertilizer treatment in perpetually wet condition since S deficiency was made in this experiment. Like S, Cu application also produced highest yield than other treatments indicating the emergence of Cu as a sixth yield limiting nutrient factor for rice in continuously wetland conditions is imminent. Reversed management i.e. addition of complete fertilizer (NPKSZnCu) produced equivalent yield to complete fertilizer treatment. Apparent nutrient balance after 29 years (1981-2009) showed and annual balance in the control plot was negative for all the nutrients, since no fertilizer was added. The balance was estimated assuming 60% of added N was lost as gaseous loss. The amount of N and K uptake was higher than those of P and S. The balance and annual balance of N was negative in all the treatments due to higher amount of N removal by crops and much of applied N was lost from the soil by various ways (volatilization, denitrification, surface runoff, leaching etc). The K balance was negative due to higher amount of K removal by crops and much of applied K was lost from the soil by leaching. The P balance was favorable, quite large amount of P was accumulated in soil of P fertilized plots. The S balance was negative in the plot where no Sulfate fertilizer was used.

Knowledge Management: Report/Proceedings