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Economic Impact of Sesbania Rostrata Intercropping and Nitrogen Rate on T. Aman Rice

M. A. Quayum
Senior Scientific Officer
BRRI, Joydebpur, GAzipur-1701, Bangladesh.

B. A. A. Mustafi
Principal Scientific Officer
BRRI, Joydebpur, GAzipur-1701, Bangladesh.

A. J. Mridha
Senior Scientific Officer
BRRI, Joydebpur, GAzipur-1701, Bangladesh.

M. A. Mazid
Principal Scientific Officer
BRRI, Joydebpur, GAzipur-1701, Bangladesh.

Abstract/ Executive Summary:

A field experiment on T. aman rice was conducted in 1994 and 1995 at BRRI farm to determine the economic impact of sesbania rostrata inter cropping and nitrogen rate on BRII variety. Among the 12 treatments, T₁ needed the highest total human labor of 247.5 mandays/ha followed by T₁₁ which needed 234.5 mandays/ha. The highest total cost was found in T₁ of Tk 9880/ha followed by r, of Tk 9600/ha. In both T₁, T₄ and T₁₁, sesbania rostrata was inter cropped with rice. But the highest grain yield was obtained in Tg where only urea was applied at the rate of 90 kg N/ha. The highest gross returns, net returns and benefit cost ratio of Tk 45663/ha, Tk 363 16/ha and 4.89 were determined in T₈, whereas the second highest gross returns and net returns of Tk 42226/ha and 32838/ha was found in T₇ where urea but not GM was applied at the rate of 60 kg N/ha. Therefore, T₈ is the most profitable and there is no effect of sesbania rostrata inter cropping on yield and returns. Dominance and marginal analyzes also indicated that applying 30 kg N/ha but not inter cropping sesbania rostrata with rice obtained 1209 percent and then increasing N rate at 90 kg/ha implies a further 474 percent marginal rate of returns.

Keywords: Economic impact, Sesbania rostrata, Intercropping, Nitrogen, Rice

Location: BRRI farm.

Start Date: 00-00-1994

End Date: 00-00-1995

Program Area: Socio-economic and Policy

Commodity: Rice

Objectives:

1. To determine the effect of sesbania rostrata inter cropping with rice on the yield of rice;

2. To determine the profitability of T. aman rice cultivation.

Methodology:

A field experiment was conducted during T. aman season in 1994 and 1995 at BRRI farm. There were 12 treatment combinations in which T₁, to T₉ were paired row rice (PR) (10 cm x 20 cm x 30 cm i. e. plant to plant 10 cm, line to line 20 cm and 30 cm where there is green manure (GM) in between this 30 cm) and T₁₀ to T₁₂ were single row rice (SR) as normal recommended planting (25 cm x 15 cm). In paired row 10 cm and 30 cm rice, the treatment inter cropped with green manure sesbania rostrata in which either single or double line GM in the centre of 30 cm inter row space and rice 20 cm at each inter row space. But the two GM establishment methods T₃ and T₄ were supplied with 30 kg N/ha from urea. In rest of paired rows (10 cm and 30 cm) rice, the treatment T₅ to T₉ were supplied with urea N at 0, 30, 60, 90 and 120 kg/ha. On the other hand, single row rice planting treatments T₁₁ and T₁₂ inter cropped with either single or double line in every 4 rows of rice which were compared without GM (T₁₁)) as control. The experiment was laid out in RCB design with 3 replications. Thirty five days old seedlings of both GM and rice in aman season (BR11) were used in this experiment. Phosphorus, potassium and sulphur at the rate of 40, 40 and 10 kg/ha were applied as basal in all treatments. Urea was used as per treatment in three equal splits at 15 days after transplanting (DAT), at maximum tillering and 5-7 days before panicle initiation stage. All the recommended cultural practices were done as and when needed for better crop grown and yield. Data for different operations were collected and recorded at the time of respective operations in each year. Price of input and output as well as wage rate were taken according to the prevailing market rate. Dominance and marginal analyzes were also done to determine the economic profitability of growing BR-11 variety.

Source of Information: Bangladesh J. Agril. Res. 24 (3) : 487-496, September 1999

Article Link (Online Journal):

Funding Source:

Budget:

Total Budget (Tk.) :

Achievement/Findings:

Among the 12 treatments, highest yield, gross return, net return and benefit cost ratio were obtained in T₈ having urea at the rate of 90 kg N/ha but not inter cropped with GM and this treatment was found to be the most profitable compared to all other treatments. Thus treatments with sesbania rostrata inter cropping were not economically profitable. But soil fertility and crop productivity per unit area for the following crops would be increased. In addition, marginal analysis indicates that applying only 30 kg N/ha without sesbania rostrata inter cropping obtained 1209 percent marginal rate of return and then using urea at the rate of 90 kg N/ha implied a further 474 percent rate of return. Therefore, there is no economic effect of sesbania rostrata inter cropping with T. aman rice in rainfed condition.

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