0737 individual and combined effect of management components of sri on the productivity of...
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Presenter: R. Rajendran, V. Ravi, N.Chelliah, and V. Balasubramanian Audience: 2nd National SRI Symposium, Agartala, India Subject Country: IndiaTRANSCRIPT
Individual and combined effect of management components of SRI on
the productivity of irrigated rice
R. Rajendran*, V. Ravi, N.Chelliah, and V. Balasubramanian
* Professor (Agronomy), Tamil Nadu Rice Research Institute (TNAU), Aduthurai, India
SRI Modified SRI
• Management practices tailored to the local conditions
• Practiced in different names - countries/region
• As “modified SRI” in Tamil Nadu
Initiated from 2002 in Cauvery Delta, Tamil Nadu
Practices recommended for SRIPractices recommended for SRI
Practices
Seedling age (days) 15
Seedlings per hill 1
Plant spacing (cm) 22.5 x 22.5
Planting geometry Square
Mechanical weeding/soil stirring
Two cono/rotary weeder
+ one HW (no herbicide)
Intermittent irrigation
2.5 cm up to flowering intermittently
Nutrient application OM + fertilizers
Objectives
n To study the individual effect of SRI
components on rice productivity
n To study the synergistic effect of SRI
practices
n To assess the factor productivity in SRI
Experimental details
Locations (2) : TRRI, Aduthurai, TN, India
SWMRI, Thanjavur, TN, India
Year : 2002 - 2004
Variety : ADT- R 45 (110 d )
Design : CRBD
Replication : 3
Treatments : 13
Treatment details
YOSCI (SRI)
YOSCF
YOSHI
YORHI
YMSCI
AOSCI
AMRHI
YMRHI
AORHI
AOSHI
AMSCI
AMSHI
AMRHF (conventional)
Y - Young seedling (15 d )
A - Aged seedling (25 d)
O - One seedling/hill
M - Multiple seedlings hill-1
S - Square planting (22.5 x 22.5cm)
R - Row planting (15x10 cm)
C - Cono weeding
H - Hand weeding
I - Intermittent irrigation
F - Flooding
7304
5646
0
2000
4000
6000
8000
GY
(kg
/ha)
MSRI Nointercultivation
CM
Rice grain yield as influenced by intercultivation with cono weeder
TRRI, Aduthurai
Yield enhanced by 29%
7500
5140
0
2000
4000
6000
8000
GY
(kg/
ha)
MSRI Nointercultivation
CM
Rice grain yield as influenced by intercultivation with cono weeder
SWMRI, Thanjavur
Yield enhanced by 46%
Impact of inter-cultivation on yield, Cauvery Delta, Tamil Nadu, 2002-04
Impact of SRI +SSNM on irrigated rice productivity, Cauvery Delta,
Kharif and rabi 2003- 04
0
2
4
6
8
F 0 LCC-N + K
3.4
5.6 5.9
3.9
6.5 6.8
Grain
yield
(t/h
a)
Treatments
Impact of modified SRI and SSNM on irrigated rice
Conventional
Modified SRI
Prob >F : F0, 0.07; LCCN, 0.02 and +K, 0.02
Rajendran et al., 2006
Dominating Pests -- Leaf folder
Impact of SRI on pest incidenceImpact of SRI on pest incidence
Detail No. of valid
seasons
Conven-tional
planting
SRI method of planting
Pest incidence
Whorl maggot (%LD)
511.56 4.82
Leaf folder (% LD) 8 12.97 21.04
Gall midge (% DT) 2 4.52 2.72
BPH (no./hill) 4 7.52 1.84
Stem borer (% DT) 6 9.86 5.48
Crop yield (kg/ha)
Grain yield 8 5,127 6,986
Ravi et al., 2006
SRI + SSNM on N use efficiency, Cauvery Delta, Kharif and Rabi, 2003-04
Prob > F : For LCC-N & + K, 0.02
25.7 28.5
05
10
15202530
LCC-N + K
Treatments
Conventional
Modif ied SRI
Rajendran et al., 2006
Management / Variety
Chlorophyll
(a: b ratio)ADT 43 ADT RH 1
Conv. + flooding 1.27:1 1.21:1
Conv. + intermittent irrigation
1.33:1 1.43:1
SRI + flooding 1.52:1 1.34:1
SRI + intermitt. irrig. 1.56:1 1.59:1
Components of chlorophyll as influenced by SRI practices, Kharif, 2005*
* Mean data
Treatments Root length (cm) Root volume (cc)
ADT 43 PHB 71 ADT 43 PHB 71
Conv. + flooding 11.6 12.0 21.8 19.3
Conv. + inter. irrig. 15.2 15.1 23.3 26.3
SRI + flooding 16.3 16.1 37.7 39.2
SRI + inter. irrig. 16.5 16.5 51.0 57.7
CD (5%) 0.7 4.0
Root growth as influenced by SRI (inter-cultivation), Kharif, 2006*
* On-going experiment
Nutrient uptake (kg/ha), TRRI Farm, Cauvery Delta, Kharif, 2005*
Treatment Grain Straw
N P K N P K
Conventional 57.0 7.9 8.7 32.6 5.9 68.7
SRI 74.1 11.0 11.3 43.7 7.8 87.0
C.D. (5%) 4.4 0.7 1.5 4.2 1.3 10.4
* On-going research project
TRRI, Aduthurai
Yield reduced by 23%
SWMRI, Thanjavur
Yield reduced by 18%
Impact of older seedling age, Cauvery Delta, Tamil Nadu, 2002 -04
7304
5632
010002000300040005000600070008000
GY (k
g/ha
)
MSRI Aged seedling
CM
Rice grain yield as influenced by aged seedling effect
75006163
0
1000
2000
3000
4000
5000
6000
7000
8000
GY (k
g/ha
)
MSRI Aged seedling
CM
Rice grain yield as influenced by aged seedling effect
Seedling age
Aduthurai Thanjavur
Panicles/m2
GY
(kg/ha)
B:C Panicles/m2
GY
(kg/ha)
B:C
Traditional nursery – 25 days
377 5874 2.6 344 5557 1.9
Modified mat nursery
15 days
452 7061* (20)
3.2 424 6583* (16)
2.7
C.D (5%) 25 163 n. a 21 121 n. a
Rajendran et al., 2005
Seedling age on rice productivity and profit, Cauvery Delta, Tamil Nadu, Rabi, 2002-03
* % yield increase over aged seedling
Influence of seedling age when planted, based on leaf number, Cauvery Delta, Kharif 2006 & Kharif 2007 (in progress)
No. of leaves per
seedling
Panicles / sq. m
ADT 43 PHB 71 Seedling mean
2 391 404 398
3 438 456 447
4 397 423 410
5 350 402 376
Cultivar mean 403 425
C.D. (5%) 10 15
Panicle production
No. of leaves per
seedling
Grain yield (kg/ha)
ADT 43 PHB 71 Seedling mean
2 7595 7903 7749
3 9198 9457 9327
4 8016 8762 8889
5 7297 8299 7798
Cultivar mean 8277 8598
C.D. (5%) 145 230
Rice grain yield
7304
6094
5000
5500
6000
6500
7000
7500
GY (k
g/ha
)
MSRI Flooding
CM
Rice yield as influenced by flooding
TRRI, Aduthurai
Yield reduced by 17%
SWMRI, Thanjavur
Yield reduced by 16%
Impact of flooding, Cauvery Delta, Tamil Nadu 2002 -04
7500
6285
5500
6000
6500
7000
7500
GY (k
g/ha)
MSRI Flooding
CM
Rice yield as influenced by flooding
4836
7304
0
1000
2000
3000
4000
5000
6000
7000
8000
GY
(kg/
ha)
Conventional M SRI
CM
5152
7500
0
1000
2000
3000
4000
5000
6000
7000
8000
GY
(kg/
ha)
Conventional M SRI
CM
Synergistic effect of SRI on rice productivity, Cauvery Delta, Tamil Nadu, 2002 - 04
TRRI, Aduthurai
Yield enhanced by 51%
SWMRI, Thanjavur
Yield enhanced by 46%
Input use/cost Aduthurai Thanjavur
SRI Conven. SRI Conven.
Nursery cost efficiency
(Rs./kg grain)
0.21 0.66 0.21 0.62
Water use (m3) 8,964 14,193 11,952 15,687
Water use efficiency (kg grain m-3 water)
0.81 0.34 0.63 0.33
Factor productivity for SRI and conventional rice cultivation, kharif and rabi, Cauvery Delta,
Tamil Nadu, 2002-04
Input use/cost Aduthurai Thanjavur
SRI Conven. SRI Conven.
Fertilizer cost efficiency (Rs./kg grain)
0.64 1.01 0.62 0.93
Weeding cost efficiency (Rs./kg grain)
0.20 0.31 0.19 0.29
Factor productivity for SRI and conventional rice cultivation, kharif and rabi, 2002- 04, Cauvery
Delta, Tamil Nadu
Targeted yield attributes for enhanced grain yield in SRI
Yield attributes Role of M SRI
1. No. of panicles/m2
2. No. of grains/panicle
3. No. of spikelets/panicle
Genotypic potential of rice plant tapped through:
Improved crop establishment
Soil stirring by cono-weeder
Intermittent irrigation
Synergistic effect of all
SRI components
Targeted yield attributes for enhanced grain yield in SRI
Yield attributes Role of Modified SRI
3. Increased no. of spikelets/panicle
Genotypic potential tapped through
Improved grain filling which resulted in more grain weight than with traditional planting
Treatments Grain
length (mm)
Grain
width
(mm)
Kernel
length
(mm)
Kernel
width
(mm)
Conventional 8.79 2.38 6.39 1.99
SRI 8.85 2.41 6.51 1.98
C.D. (5%) 0.09 0.04 0.08 0.04
Improved grain quality in SRI
Cauvery Delta, Kharif, 2005
What to do?
For farmer-friendly and faster adoption of SRI:
• Strengthening of nursery & water management practices through community approach
• Training of farmers and farm labourers in square planting
• Mechanization of inter-cultivation
• Increasing awareness on healthy nutrient management, especially for N management
Key is the healthy crop establishment