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Integrated Management of Sesbania Rostrata and Urea Nitrogen in Rice Under a Rice-rice Cropping System

M. S. Aktar
Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Jessore, Bangladesh.

M. K. Hasan
Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Jessore, Bangladesh.

R. C. Adhikery
Regional Agricultural Research Station, Bangladesh Agricultural Research Institute, Jessore, Bangladesh.

M. K. Chowdhury
Senior Scienfific Officer
Bangladesh Agricultural Research Institute, Gazipur 1701, Bangladesh.

Abstract/ Executive Summary:

An investigation was undertaken at the farming systems research site, Bagherpara, Jessore, to study the effects of green manuring (Sesbania rostrata) followed by five rates of N application on the grain yield of T. aman rice and physical and chemical properties of soil. Grain yield of rice increased significantly after green manuring. Application of a varied rates of N further Improved the yield. Addition of 30 kg N/ha after green manuring produced almost similar grain yield to that of 90 kg N/ha without green manuring. Availability of N, P and K in the soil and the water holding capacity of the soil increased after green manuring.

Keywords: Sesbania rostrata, Urea, Rice-Rice cropping system

Location: Farming Systems Research (FSR) site, Bagherpara, Jessore.

Start Date: 00-00-1991

End Date:

Program Area: Farming System

Commodity: Manures

Objectives:

(i) To test the feasibility of using Sesbania rostrata as a catch crop after harvest of Boro rice for manuring the following transplanted aman rice.

(ii) To evaluate the amount of fertilizer N that can be substituted by Sesbania rostrata.

(iii) To study the availability of nutrients in soil after manuring.

Methodology:

The experiment was conducted at the- Farming Systems Research (FSR) site, Bagherpara, Jessore, in 1991 under irrigated conditions in medium high land having a soil pH range of 7.0-8.5. It was laid out in a split- plot design with four dispersed replications. The following treatments were used: Main plot: (1) Fallow (without green manure) and (ii) Sesbania rostrata as green manure. Sub-plot: Nitrogen at 0, 30, 60, 90, and 120 kg/ha. Unit plot size was 100 m². Sesbania rostrata was sown during the last week of May. The crop was fertilized with 60 kg P₂O₅/ha. Fifty five days old Sesbania rostrata was harvested in the third week of July, weighed (@ 20 t/ha) and incorporated in the soil, and the land was prepared for subsequent transplanted aman rice. P and K fertilizers were applied at the rate of 60 kg P₂0₅ and 40 kg K₂O/ha, respectively, in the fallow plot and only 40 kg K₂O/ha in the green manured plot during final land preparation. Thirty day old rice seedlings were transplanted at 25 cm x 15 cm spacing during the third week of July. Three to four seedlings were used per hill. Five levels of nitrogen viz. 0, 30, 60, 90 and 120 kg/ha were applied as top-dressing in three equal splits viz. 15 days after transplanting, at maximum tillering and a week before panicle initiation. All cultural practices were done as and when necessary. The crop was harvested during the first fortnight of November. All data were statistically analyzed using "Analysis of Variance" technique and differences among treatment means were compared by means of Duncan's Multiple Range Test. Economic analysis was done as per Perrin et al..

Source of Information: Ann. Bangladesh Agric. 3(2) : 109-114, 1993

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Complementary use of green manuring with mineral fertilizers is considered important under Bangladesh conditions, particularly to increase the utilization efficiency of applied fertilizers and to maintain the currently deteriorating soil fertility at desired level. Based on the results, it can be concluded that Sesbania rostrata can be grown as green manure in between the two rice crops in Boro-T. aman cropping pattern. Green manuring with Sesbania rostrata efficiently economized N dose, it contributed slightly more than 60 kg N equivalent per hectare. These results suggest that farmers can apply only 30 kg N/ha after green manuring in transplanted aman rice to get a high rate of return on their investment and for amelioration of soil fertility problems.

Knowledge Management: Journal