The document describes a new Aus-Aman cropping system for increasing cropping intensity in coastal Bangladesh. The system involves growing a short-duration aus rice during the pre-monsoon season followed by a high-yielding aman rice variety in the monsoon season. Supplementary irrigation using groundwater helps ensure the establishment of the aus rice crop. This new system can increase total annual production to 8-9 tons per hectare compared to the traditional single aman rice system, helping address food insecurity in the coastal region.

1. Aus-Aman cropping system: new approach for increasing cropping intensity in southwest coastal Bangladesh Sanjida Parveen Ritu, BRRI To Phuc Tuong, IRRI Manoranjan Mondal, IRRI Shahid Ullah Talukder, BAU

7. New Cropping Systems 20 Apr 30 July 1 0 Aug 5 Dec River water EC5-15 dSm -1 River water EC 5-15 dSm -1 Rainfall ~1500 mm leaching down soil salinity Aus-Aman-Fallow Cropping System Groundwater EC 2-3dSm -1 River water EC < 2dSm -1 Rainfall and river water EC 0-2 dSm -1 3-4 t ha -1 4-5 t ha -1 T. Aman (130-140 d) Aus (100-105 d) A M J J A S O N D J F M A

8. New Cropping Systems 10 May 20 aug 30 Aug 20 nov River water EC5-15 dSm -1 River water EC 5-15 dSm -1 Rainfall ~1500 mm leaching down soil salinity Aus-Aman-Fallow Cropping System River water EC < 2dSm -1 Rainfall and river water EC 0-2 dSm -1 8-9 t ha -1 yr -1 20 May 20 aug 30 Aug 15 Dec 7-8 t ha -1 yr -1 T. Aman (~130d) Photosensitive Aus (100-105 d) A M J J A S O N D J F M A Aus (100-105 d) T. Aman (~140d) Nonphoto sensitive

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