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Transcript of 0737 Individual and Combined Effect of Management Components of SRI on the Productivity of...
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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
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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
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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
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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
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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
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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
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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
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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
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Dominating Pests -- Leaf folder
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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
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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
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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
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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
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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
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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
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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
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Influence of seedling age when planted, based on leaf number, Cauvery Delta, Kharif 2006 & Kharif 2007 (in progress)
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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
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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
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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
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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%
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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
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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
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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
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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
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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
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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
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Key is the healthy crop establishment
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