CSISA 1 CEREAL SYSTEMS INITIATIVE FOR SOUTH ASIA (CSISA) 7 June 2011, IRRI Office, Dhaka
CSISA 1
CEREAL SYSTEMS INITIATIVE FOR SOUTH ASIA (CSISA)
7 June 2011, IRRI Office, Dhaka
Phases and stages of rice plant
3 Phases:1. Vegetative phase2. Reproductive phase3. Ripening phase
Ripening phase-: 30 days,Reproductive phase: 30 daysRest part vegetative phase
Growth phases of rice plant (Varietals differences)
Vegetative Phase100 days
Reproductive Phase
30 days
Ripening Phase
30 days
BRRI dhan29(160 days)
Vegetative Phase80 days
ReproductivePhase
30 days
RipeningPhase
30 days
BRRI dhan28(140 days)
Impact of temperature on growth phases (BR 3)
Vegetative Phase110 days
Reproductive30 days
Ripening30 days
Boro(170 days)
Vegetative Phase70 days
Reproductive30 days
Ripening30 days
Aus(130 days)
Vegetative Phase85 days
Reproductive30 days
Ripening30 days
T. Aman(145 days)
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
Photoperiod sensitive rice
PI depends on day length
Takes more time after completing of basic vegetative phase
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 dayActive
Lag
Stages of Rice1. Germination stage:
Coleorhiza starts before coleoptile
But coleoptile comes out earlier than coleorhiza
Soaking for 24-48 hrs and incubation for 24-72 hrs: germinattion occurs
Seedling stage
Seedling stage: germination to 5 leaf stage
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)
In 200 c, 5 days/leaf In 250 c, 4 days/leaf
Transplanting stage
Transplanting to establishment In T. Aus and T. Aman 5-7 days In Boro 10-15 days 0 day in DSR
Tillering stage
a¡lfl kMe 3u d¡ fl L¤¢n N¡S¡u aMe S¢j d¡e N¡ R i l k¡uz
Stem elongation stage
Not visible up to 9 days1.0 t0 1.5 mm after 10 days
Panicle development
Female organs
Male organs
Pollination
Flowering at different parts of panicle
•
90-100 % paddy hard and yellow colouy
Leaf died
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
CSISA 49