Optimum sowing window for boro

rice cultivation in the coastal zone of

Bangladesh

M K Mondal, N K Saha, A K M Sharifullah, S P Ritu,

P L C Paul, E Humphreys, T P Tuong, M A Rashid

Patuakhali STU

Polder 43/2F

Polder 30

Andy Nelson

“LOW SALINITY” (L)

•Water “stagnation” 30-50 cm

weeks to months in aman

•River water fresh year-round

•Mild soil salinity in dry season

“MEDIUM SALINITY” (M)

•Water “stagnation” 30-50 cm

weeks to months in aman

•River water saline mid-Feb-Jun

•Medium soil salinity in dry season

2

POLDER-43/2f

Salinity Dynamics in the Peripheral river of Polder 43/2F

Kharif-2 Rabi Kharif-1

0

0.1

0.2

0.3

0.4

0.5

0.6

0.71

-Mar

-12

1-M

ay-1

2

1-J

ul-

12

1-S

ep-1

2

1-N

ov-

12

1-J

an-1

3

1-M

ar-1

3

1-M

ay-1

3

1-J

ul-

13

1-S

ep-1

3

1-N

ov-

13

1-J

an-1

4

1-M

ar-1

4

1-M

ay-1

4

1-J

ul-

14

Wat

er

Salin

ity

(dS/

m)

Canal Water EC at Bazarkhali, Barguna

Canal Water EC at PSTU, Patuakhali

0.0

0.2

0.4

0.6

0.8

1.0

Wat

er

salin

ity

(dS/

m)

Yield of BRRI dhan28 at Bazarkhali, Barguna and PSTU, Patuakhali

0

2

4

6

8

10

D1=15Nov

D2=20Nov

D3=30Nov

D4=05Dec

D5=15Dec

D6=30Dec

Yie

ld (

t/h

a)

2011-12 Bazarkhali 2012-13 Bazarkhali

2013-14 Bazarkhali 2013-14 PSTU

Growth duration of BRRI dhan28 at Bazarkhali, Barguna and PSTU, Patuakhali

y = -2.65x + 143.05 R² = 0.9726

0

40

80

120

160

D1=15 Nov D2=20 Nov D3=30 Nov D4=05 Dec D5=15 Dec D6=30 Dec

Bazarkhali PSTU

Minimum temperature in Patuakhali during Boro seasons 2011-12 to 2013-14

0

5

10

15

20

25

30

351

-No

v

9-N

ov

17

-No

v

25

-No

v

3-D

ec

11

-Dec

19

-Dec

27

-De

c

4-J

an

12

-Jan

20

-Jan

28

-Jan

5-F

eb

13

-Fe

b

21

-Fe

b

29

-Fe

b

8-M

ar

16

-Mar

24

-Mar

1-A

pr

9-A

pr

17

-Ap

r

25

-Ap

r

Tem

pe

ratu

re (

de

g C

)

Boro 2011-12

Boro 2012-13

Boro 2013-14

D6 D5 D4

D3 D2

D1

POLDER-30

Kharif-2 Rabi Kharif-1

Salinity Dynamics in the Peripheral river of Polder-30

0

5

10

15

20

25

28

-Feb

-12

28

-Ap

r-1

2

28

-Ju

n-1

2

28

-Au

g-1

2

28

-Oct

-12

28

-Dec

-12

28

-Feb

-13

30

-Ap

r-1

3

30

-Ju

n-1

3

31

-Au

g-1

3

31

-Oct

-13

Wat

er

Salin

ity

(dS/

m)

Canal Water EC at Kismatfultola, Khulna

0

3

6

9

12

15

18

21

24

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

Month

Riv

er

wa

ter

Sa

lin

ity (

ds/m

)

High tide Low tide

River salinity dynamics in at Batiaghata, Khulna from 1999-2007

Canals and sluice gate in coastal polder

Non-saline river water conserved in canals

Taking-in non-saline river water during high tide through sluice gate

Yield of BRRI dhan28 at Kismatfultola, Batiaghata, Khulna

0

2

4

6

8

D1=22Oct

D2=01Nov

D3=07Nov

D4=10Nov

D5=15Nov

D6=30Nov

D7=20Dec

Yie

ld (

t/h

a)

2005-06 2006-07 2011-12 2012-13 2013-14

Cold injury at PI

Cold injury on seedbed and TP

Cold injury at TP

Cold injury at PI

Yield of BRRI dhan28 at Kismatfultola, Batiaghata, Khulna

-2

0

2

4

6

D1=22Oct

D2=01Nov

D3=07Nov

D4=10Nov

D5=15Nov

D6=30Nov

D7=20Dec

Yie

ld (

t/h

a)

Optimum sowing: 7-15 November

Minimum temperature at panicle initiation (PI) in Khulna during Boro seasons 2005-06 to 2006-07

0

3

6

9

12

15

18

21

24

27

30

0 3 6 9 12 15 18 21 24 27 30 33 36 39 42 45 48 51 54 57 60

Tem

per

atu

re (

deg

C)

Day of Year

2006

2007

D1V1-06

D2V1-06

D1V1-07

D2V1-07

Relationship between floret fertility and grain yield of BRRI dhan28, Boro seasons 2005-06 and 2006-07

R² = 0.8244

0

1

2

3

4

5

6

0 20 40 60 80 100

Gra

in y

ield

(t/

ha)

Floret fertility (%)

Growth duration of BRRI dhan28 at Kismatfultola, Batiaghata, Khulna

y = -2.8571x + 159.21 R² = 0.8093

0

30

60

90

120

150

180

D1=22Oct

D2=01Nov

D3=07Nov

D4=10Nov

D5=15Nov

D6=30Nov

D7=20Dec

Gro

wth

Du

rati

on

(d

)

Sowing Date

Minimum temperature in Khulna during Boro seasons 2011-12 to 2013-14.

0

5

10

15

20

25

30

351

-No

v1

1-N

ov

21

-No

v1

-Dec

11

-Dec

21

-Dec

31

-Dec

10

-Jan

20

-Jan

30

-Jan

9-F

eb1

9-F

eb2

9-F

eb1

0-M

ar2

0-M

ar3

0-M

ar9

-Ap

r1

9-A

pr

29

-Ap

r

Te

mp

era

ture

(d

eg

C)

Boro 2011-12

Boro 2012-13

Boro 2013-14

D5 D6 D7

Total and canal water used for boro rice cultivation at Kismat Fultola, Batiaghata, Khulna during 2005-2007

0

200

400

600

800

D1 = 22 Oct D2 = 01 Nov D3 = 07 Nov D4 = 15 Nov

Am

ou

nt

of

wat

er

(mm

)

Total water 2005-06 Total water 2006-07

Canal water 2005-06 Canal water 2006-07

Irrigation water productivity for boro rice cultivation at Kismat Fultola, Batiaghata, Khulna during 2005-2007

0

2

4

6

8

10

12

14

D1 = 22 Oct D2 = 01 Nov D3 = 07 Nov D4 = 15 Nov

Wat

er

pro

du

ctiv

ity

(kg/

ha-

mm

)

WPi 2005-06

WPi 2006-07

Criteria SC (Barisal) SW (Khulna)

Sowing Period 15 Nov-15 Dec 7-15 Nov

Yield 6-7 t/ha 4-5 t/ha

River water salinity

< 1 dS/m 2-10 dS/m

Suitability High Marginal, Risky

Conclusion & Recommendation

BORO rice cultivation should be promoted in BARISAL

region of Bangladesh for higher land productivity and

food security.

Thank You