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Productivity and Economic Impact of Late Transplant Aman Rice as Affected by Spacing and Variety.

M.J.U. Chowdhury
Former CSO and Head
Farm Management Division Bangladesh Rice Research Institute (BRRI) Gazipur-1701, Bangladesh

Dr. K.P. Halder
CSO and Head
Farm Management Division Bangladesh Rice Research Institute (BRRI) Gazipur-1701, Bangladesh

Dr. M.S.Kabir
Director (Admin & Common service)
Bangladesh Rice Research Institute (BRRI) Gazipur-1701, Bangladesh

Abstract/ Executive Summary:

An experiment was conducted at the Bangladesh Rice Research Institute (BRRI) farm, Gazipur to select suitable rice variety and profitability of late transplant aman (T. aman ) rice. The experiment was conducted in 1996 with three spacing i.e. (15cm x 15cm); (20cm x15cm) and (20cm x 20cm) and three varieties viz. BR22, BR23 and Nizersail. The results revealed that the variety BR23 and the spacing (15cm x 15cm) showed better performance in terms of grain and straw yield, panicle number. 1000 grain weight and gross return. Labourer requirement varied for different operations of rice cultivation for spacing and variety. The gross margin was the highest (Tk. 26384) in (15cm x 15cm) spacing for BR23 followed by BR22 and Nizersail.

Keywords: Late T. aman, Variety, Spacing and Profitability

Location: Bangladesh Rice Research Institute (BRRI) farm, Gazipur, Bangladesh

Start Date: 00-00-1996

End Date: 00-00-1996

Program Area: Socio-economic and Policy

Commodity: Rice

Objectives:

Management of spacing, planting technique and inputs utilization play a vital role to increase rice yield. Among the inputs, varieties came first for higher yield. On the other hand, closer spacing for T. aman rice in late season is desirable for higher yield. Adjustment of plant spacing depends on variety, cultural management, soil fertility and growing season. Moreover, operation wise labor requirements and cost involvement for late T. aman cultivation is to be considered for better benefits. This information is sporadic and scattered. Therefore, a study was undertaken to find out suitable variety/varieties, optimum spacing and profitability of late T. aman rice.

Methodology:

The experiment was conducted at the BRRI farm, Joydebpur, Gazipur during T. aman season of 1996. Transplanting was done on 15 September, were the optimum time of transplanting T.aman rice is considered upto 15 August (Islam, 1980 and Halder, 1992). The tested varieties were BR22 and Nizersail and spacing were 20cm x 20cm. 20cm x 15cm and 15 cm x 15 cm, assigned in a Randomized Complete Block (RCB) design with three replication. The unit plot size was 4m x 5m. Forty days old seedlings at the rice of 3 seedlings hill was transplanted. Fertilizer as N, P₂O₅ and K₂O were applied from urea, triple super phosphate (TSP) and muriate of potash (MP) at the rate of 60, 40 and 40 kg ha^-1, respectively. All P₂O₅ and K₂O and one third of N were applied as basal dose and the rest of N was applied as two equal split one at 15 days after transplanting (DAT) and other at 30 DAT. Cultural operations were done as and when necessary. The marginal rate of return (MRR) and average rate of return (ARR) were calculated.

a. Marginal rate of return (MRR) = Marginal gross margin (MGM) x 100/Marginal variable cost (MVC)

b. Average rate of return (ARR) = Highest (MGM) - Lowest (MGM) X 100/Highest total variable cost (TVC) - Lowest (MGM)

Source of Information: Bagladesh J. Agril. Sci. 27(2): 233-238; July 2000

Article Link (Online Journal):

Funding Source:

1. Government

Budget:

Total Budget (Tk.) :

Achievement/Findings:

The higher marginal rate of return was due to 15cm x 15cm spacing for all the studied varieties. These were 407%, 508% and 12% for BR22, BR23 and Nizersaill, respectively. This result revealed that every additional investment of Tk. 100 may return Tk. 407, Tk. 508 and Tk. 12 for BR22, BR 23 and Nizersail, respectively. It indicated that BR23 is the most profitable variety followed by BR22 and Nizersail, respectively, in late planting situation with 15cm x 15cm spacing. The average rate of return was also higher in 15cm x 15 cm spacing for BR22 and BR23 which were 227% and 323%, respectively. Therefore, it may be concluded that BR23 and closer spacing ( 15 cm x 15cm ) may be used for higher yield and economic benefits in case of T. aman cultivation in late season.

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