The document summarizes research on the System of Rice Intensification (SRI) conducted in China. Key findings include: 1) SRI practices like sparse planting, younger seedlings, and irrigation management led to increased tiller growth, root growth, and higher yields compared to conventional methods. 2) In 2003, SRI methods increased average yields by 21.6% and grain weight by 4.3% compared to conventional checks. Increased grain number and panicles contributed most to higher yields. 3) SRI required less water, with one experiment finding water savings of 22.4-39.5% compared to conventional irrigation methods. 4) SRI principles could help further increase yields of new

2. Basic principles of SRI and functions Water saving, root growth, and fertilizer use efficiency Irrigation management Soil fertility Organic/chemical fertilizer Tiller growth, large panicle Sparse planting Tiller growth Younger seedlings Function Basic principle

3. Contributions of SRI Sustainable soil fertility Organic/chemical fertilizer Water saving Irrigation management Labor saving Sparse planting with younger seedlings Contribution Practice

4. Comparison of yield in SRI and check (Jiayou 99 variety), 2003 9.3 11.1 Yield (t/hm 2 ) 100.0 25.1 92.6 191 209.6 CK 119.4 25.3 91.2 222.8 215.7 SRI Relative yield(%) Grain weight (g /1000) Fertility (%) Grains (No./ panicle Panicle (No./m 2 ) TR

6. Analysis of factors of yield increase in SRI compared with check 100.0 1.73 Total 4.3 0.07 Grain weight 80.1 1.38 Grain no. 15.7 0.27 Panicle no. Contribution (%) Yield (t/hm 2 ) Item

7. Pattern of tiller growth in SRI and check

8. Light penetration

9. Experiment of water saving at CNRRI

10. Comparison of water consumption in SRI and check 39.5 3806.7 S2 44.7 3477.0 S3 22.4 4879.9 S1 0.0 6289.8 CK Rate of saved water (%) Water consumption (m3/ha) Treatment

11. Transplanting in shallow water layer

12. 33 DAS

15. Heavy panicles

16. Normal 3-S (SRI)

17. Sparse sowing Check

18. Wide row planting

19. Moist soil

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