rice-rice-rabi systems for low salinty regions of the coastal zone of bangladesh

J. Bhattacharya, M. K. Mondal, E. Humphreys, M. H. Rashid, P. L. C. Paul and S. P. Ritu

Jun Jul Aug Sep Oct Nov Dec Jan Feb Mar Apr May Jun

Local Rice Varity(2-3 t/ha)

Mungbean/Grass Pea (0.5-1.0 t/ha

Traditional Cropping System (Farmers’ Practice)

Objectives

➢ feasibility of Rice-Rice-Rabi system

➢ can we fit 3 high yielding crops together?

➢ optimum sowing date for maximum

system productivity?

Proposed cropping pattern

Weed ManagementHand weeding – plots kept weed free

Disease and Insect Management

Recommended practice when needed

BRRI & BARI , 2011

Rice- ¼ N + all fertilizers- Basal, MT, 5-7 dB PIMaize- 1/3 N + all fertilizer- Basal, 25-30, 45-50 DASSunflower- 1/3 N + all fertilizer-Basal, 20-25, 40-45 DAS

Water Management

Crop monitoring

Rice Maize Sunflower

Phenology & Biomass

Mid tilleringPanicle initiation

(PI)Flowering

Physiological maturity (PM)

8-9 L, tasselling-silking, mid-grain

filling, PM

8-9 L, heading, seed

development, PM

Yield and yield contributing character

Panicles/m2

Sterility %1000 GW

Cobs/plant, cob length, ear/cob,

1000 EW

Head diameter, seed setting percentage, seeds/head,

1000 SWGrain yield Grain yield Cob yield Seed yield

Results

❑ Duration of crops in fieldSunflower- 305 d Maize 321 dAus-aman-rabi is FEASIBLE where

- able to drain & thus grow HYV aman- fresh water for irrigation of rabi crops

A M J J A S O N D J F M A

Sunflower/Maize

System production 14.1 to 19.5 t/ha/yr (3-4 times than farmers’

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