Improving drainage is crucial for cropping intensification in the polderred coastal zones of Bangladesh To Phuc Tuong, IRRI Manoranjan Mondal, IRRI Sanjida Parveen Ritu, BRRI Abul Kalam Sharifullah, BARD Elizabeth Humphreys, IRRI
New Cropping Systems 1 May 20 July 1 Aug 25 Nov 5 Dec 5 Apr River water EC5-15 dSm -1 River water EC 5-15 dSm -1 Rainfall ~1500 mm leaching down soil salinity Aus-Aman-Boro Cropping System Boro (140-145 d) T. Aman (130-140 d) Aus (100-105 d) M J J A S O N D J F M A M
New Cropping System 10 Apr 30 June 10 July 15 Nov 1 5Apr Rainfall ~1500 mm leaching down soil salinity River water EC 5-15 dSm -1 River water EC 5-15 dSm -1 Aus-Aman-Rabi Cropping System Rabi (130-140 d) 1 Dec T. Aman (130-140 d) Aus (100-105 d) A M J J A S O N D J F M A
Constrains to New Cropping Systems Deep flooding at the beginning of rainy season constrains the establishment of aman rice and adoption of modern high yielding varieties Prolonged water log at the end of rainy season delay establishment of rabi crop A M J J A S O N D J F M A T. Aman (130-140 d) Aus (100-105 d) Rabi ( 130-140 d)
High Tide Low Tide Land Land Surface Embankment River Bed Sluice gate 1-2 m How to Adopt New Cropping Systems?
To realize the new cropping system, it is crucial to improve the drainage of the polders