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On-Farm Assessment of the System of Rice Intensification (SRI) Under Rainfed Lowland Fields of Southern Cambodia KCI 등재
- 언어ENG
- URLhttps://db.koreascholar.com/Article/Detail/432780
pp.63-75
The system of rice intensification (SRI) has been proposed as a way of transitioning towards more sustainable rice farming. In rainfed rice farming, however, various environmental constraints often make SRI practices challenging to adopt. We conducted an on-farm experiment in 30 rainfed lowland fields to examine the technical efficacy of SRI in southern Cambodia during the wet seasons of over three years of 2012, 2013, and 2015. Across the three years, the SRI practices produced significantly greater plant biomass and grain yield than non-SRI. We ascribed the yield increase to the increased number of grains per land area as the increased number of spikelets per panicle rather than the number of panicles per land area. With no significant difference in seedling age between the SRI and the non-SRI, we attributed the more substantial number of grains per panicle to the reduced planting density, increased manure application, and reduced amount of inorganic fertilizers in SRI fields. Our results suggest that the advantage of the SRI lies in the efficient use of internally available soil nutrients, whose mechanisms need quantitative understanding through future studies.
STUDY AREA AND METHODS OF STUDY
Study site
Preliminary survey
On-farm experiment and crop management
Measurements of climatic variables
Nutrient, soil and plant measurements
Data analysis
RESULTS
Comparison between SRI and non-SRI practices incrop management as found in the field interview survey
Climate and crop management during the on-farmexperiment
Nutrient management and soil properties in the onfarmexperiment
Yield components, plant biomass, grain yield, and Nuptake in the on-farm experiment
DISCUSSION
Effects of topography in the on-farm experiment
Effects of SRI practices on nutrient budget in theon-farm experiment
CONCLUSION
적 요
REFERENCES
