Life Cycle of Rice

1
CEREAL SYSTEMS INITIATIVE FOR SOUTH ASIA (CSISA)
Life Cycle of Rice Plant Dr. Md. Harunur
Rashid CSP, IRRI  
7 June 2011, IRRI Office, Dhaka
2
Phases and stages of rice plant
3
3 Phases1. Vegetative phase2. Reproductive
phase3. Ripening phase

4
Ripening phase- 30 days,Reproductive phase 30
daysRest part vegetative phase

5
Growth phases of rice plant (Varietals
differences)
6
Impact of temperature on growth phases
(BR 3)
Vegetative Phase 110 days
Reproductive 30 days
Ripening 30 days
Boro (170 days)
Vegetative Phase 70 days
Reproductive 30 days
Ripening 30 days
Aus (130 days)
Vegetative Phase 85 days
Reproductive 30 days
Ripening 30 days
T. Aman (145 days)
7
Vegetative phase

• Basic vegetative phase
• Lag vegetative/ photosensitive phase
• Period of this stage Generally 35-65 days.
  However, some varieties it takes 20 days and some
  other takes 85 days

8
Photoperiod sensitive rice

• PI depends on day length
• Takes more time after completing of basic
  vegetative phase

9
Example of photosensitivity

• Photo insensitive
• Veg. Rep. Ripen.
  13 hrs day
• Veg. Rep. Ripen
  11 hrs day
• Photo insensitive/ photosensitive
• Veg. Rep Ripen. 13 hrs
  day
• Veg. Rep. Ripen.
  11 hrs day

Active
Lag
10
Stages of Rice1. Germination stage

11
Coleorhiza starts before coleoptile
12
But coleoptile comes out earlier than coleorhiza
13
Soaking for 24-48 hrs and incubation for 24-72
hrs germinattion occurs
14
Seedling stage

15
Seedling stage germination to 5 leaf stage
16
Leaf number and tiller relationship

• X leaf -3
• (L-3)
• 1-3 -2 (no tiller)
• 2-3 -1 (no tiller)
• 3-3 0 (no tiller)
• 4-3 1 (no probability for tillering as leaf 1
  is not fully expanded)
• 5-3 2 (Tiller from 2 node)

17
(No Transcript)
18
(No Transcript)
19
In 200 c, 5 days/leaf In 250 c, 4 days/leaf
20
Transplanting stage

• Transplanting to establishment
• In T. Aus and T. Aman 5-7 days
• In Boro 10-15 days
• 0 day in DSR

21
Tillering stage

22
(No Transcript)
23
(No Transcript)
24
(No Transcript)
25
Stem elongation stage

26
(No Transcript)
27
(No Transcript)
28
Not visible up to 9 days1.0 t0 1.5 mm after 10
days
29
Panicle development
30
(No Transcript)
31
(No Transcript)
32

33
(No Transcript)
34
(No Transcript)
35
Female organs
36
Male organs
37
Pollination
38
Flowering at different parts of panicle
39
(No Transcript)
40
(No Transcript)
41
(No Transcript)
42
(No Transcript)
43
(No Transcript)
44
(No Transcript)
45

46
90-100 paddy hard and yellow colouy
47
Leaf died
48
Intercultural operations at different stages of
rice life cycle

• Weeding
• Fertilizer
• Irrigation
• Yield is the function of number of panicle,
  filled spikelet and mean individual grain weight

49
(No Transcript)