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Towards a more sustainable rice crop: the Rice
System Intensification (SRI) experience in
Chilean temperate japonica rice.
Karla Cordero Lara, Eng. Agr. M.Sc. Ph.D.
Instituto de Investigaciones Agropecuarias, INIA-Chile.
SRI is a set of climate-smart
agroecological practices to increase
rice productivity and sustainability by
changing plant density, soil, water and
nutrients, reducing the inputs. Even
though this system has been widely
used in the world; no experiences in
low temperature environments have
been done. To face challenging
cropping conditions generated as
consequences of climate change, the
study of more sustainable practices
are required to be able to increase the
rice production.
Introduction
Objectives
Materials and Methods
Four cropping systems were established in Parral,
during 2017/2018. SRI-1, SRI-2, Conventional
flooding (CF) and Conventional direct sow (CDS) were
conducted in RCBD with three replications. Zafiro-
INIA a temperate japonica variety was used. SRI-1
consisted: 2 leaves seedlings (one plant) were
transplanted in 30x30cm grid and irrigated every 8 days
(weeds were controlled mechanically). SRI-2 consisted
in same water and weed management as SRI-1, but 3
leaves seedlings (2 plants) were used (grid 30x12cm).
CF used pregerminated seeds (160 kg/ha) and
continuous flooding conditions. Weeds were controlled
by herbicides. For CDS, dry seeds (140 kg/ha) were
sown and irrigated twice before continuous flooding.
Grain yield, sterility percentage, grain quality, days to
heading, tillers number; total grain number was
evaluated among others.
The best yield (8 ton/ha) was CF
mainly due to the weed control and
thermic buffer water effect. Followed
by CDS (7 t/ha), SRI-2 (6.5 t/ha) and
SRI-1 (5.4 t/ha). All treatments
obtained high grain quality (over
60%). SRI-1 showed in average more
than 30 productive tillers per plant,
meanwhile conventional methods
only 7. Even though SRI methods
didn’t get maximum productive
levels, the results are promising
considering that 6.5 t/ha were
produced using only a third of water
used conventionally. This shows that
it is possible to produce rice in Chile
not using the thermic protection of
water.
Results
• Introduce, adapt and validate
basic SRI’s principles to Chilean
rice productive conditions.
• Increase the sustainability in
agronomic practices utilized in
Chilean rice production.
Results
Conclusions
• SRI principles are suitable for rice
cultivation under cold stress.
• Rice production in Chile could
increase using SRI and WUE varieties
Fig 1. Aerial view of different treatments under study in Parral, Chile, season
2016-2017.
Fig 2 and 5. Different treatments under study in Parral, Chile, on left four
treatments in vegetative stages, on right, irrigated treatments and farmers
extension activities.
Fig 3. Agronomic traits evaluated under four treatments. Different letters means
significant differences among treatments under Test:LSD Fisher Alfa=0.05
Fig 4. Yield components evaluated under four treatments. Different letters
means significant differences among treatments under Test:LSD Fisher
Alfa=0.05

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  • 1. P1-A-1 Towards a more sustainable rice crop: the Rice System Intensification (SRI) experience in Chilean temperate japonica rice. Karla Cordero Lara, Eng. Agr. M.Sc. Ph.D. Instituto de Investigaciones Agropecuarias, INIA-Chile. SRI is a set of climate-smart agroecological practices to increase rice productivity and sustainability by changing plant density, soil, water and nutrients, reducing the inputs. Even though this system has been widely used in the world; no experiences in low temperature environments have been done. To face challenging cropping conditions generated as consequences of climate change, the study of more sustainable practices are required to be able to increase the rice production. Introduction Objectives Materials and Methods Four cropping systems were established in Parral, during 2017/2018. SRI-1, SRI-2, Conventional flooding (CF) and Conventional direct sow (CDS) were conducted in RCBD with three replications. Zafiro- INIA a temperate japonica variety was used. SRI-1 consisted: 2 leaves seedlings (one plant) were transplanted in 30x30cm grid and irrigated every 8 days (weeds were controlled mechanically). SRI-2 consisted in same water and weed management as SRI-1, but 3 leaves seedlings (2 plants) were used (grid 30x12cm). CF used pregerminated seeds (160 kg/ha) and continuous flooding conditions. Weeds were controlled by herbicides. For CDS, dry seeds (140 kg/ha) were sown and irrigated twice before continuous flooding. Grain yield, sterility percentage, grain quality, days to heading, tillers number; total grain number was evaluated among others. The best yield (8 ton/ha) was CF mainly due to the weed control and thermic buffer water effect. Followed by CDS (7 t/ha), SRI-2 (6.5 t/ha) and SRI-1 (5.4 t/ha). All treatments obtained high grain quality (over 60%). SRI-1 showed in average more than 30 productive tillers per plant, meanwhile conventional methods only 7. Even though SRI methods didn’t get maximum productive levels, the results are promising considering that 6.5 t/ha were produced using only a third of water used conventionally. This shows that it is possible to produce rice in Chile not using the thermic protection of water. Results • Introduce, adapt and validate basic SRI’s principles to Chilean rice productive conditions. • Increase the sustainability in agronomic practices utilized in Chilean rice production. Results Conclusions • SRI principles are suitable for rice cultivation under cold stress. • Rice production in Chile could increase using SRI and WUE varieties Fig 1. Aerial view of different treatments under study in Parral, Chile, season 2016-2017. Fig 2 and 5. Different treatments under study in Parral, Chile, on left four treatments in vegetative stages, on right, irrigated treatments and farmers extension activities. Fig 3. Agronomic traits evaluated under four treatments. Different letters means significant differences among treatments under Test:LSD Fisher Alfa=0.05 Fig 4. Yield components evaluated under four treatments. Different letters means significant differences among treatments under Test:LSD Fisher Alfa=0.05