Efficient Resource Utilization in SRI Method of Rice (CORH3) Cultivation – An Analysis

1. Efficient Resource Utilization in SRI Method of Rice (CORH3) Cultivation – An Analysis Subbalakshmi Lokanadhan Professor (Agronomy) Department of Rice Tamil Nadu Agricultural University Coimbatore – 641 003.

2. MANAGEMENT PRACTICES IN SRI / STANDARD METHOD

3. CORH 3: Salient Features

5. SRI system of rice cultivation recorded higher values of tillers at tillering (15), PI (23) flowering (26) and maturity (25) compared to standard method, recording 9 tillers/hill at tillering, 8 each at PI and flowering, and 7 tillers/hill at maturity • Tillers/m2 was higher in standard method recording 440/m2 at tillering, 400/m2 at PI, while SRI recorded higher tiller number of 402/m2 at flowering and maturity • Plant height was higher in standard method at tillering (58cm) and PI (69cm), and higher in SRI with 81cm at flowering and 83 cm at maturity • SRI dry matter production was higher at flowering (10.13 t/ha) and maturity (11.0 t/ha) compared standard method

6. WEED POPULATION AND DRY WEIGHT • SRI recorded 14.05/m2 (20 DAT) and 4.17 no/m2 (40 DAT) standard method recorded 12.13/m2 and 6.58/m2 respectively • At 20 DAT, SRI contributed to higher weed dry weight (9.48 kg/ha) at 20 DAT, while it was lower (6.04 kg/ha) at 40 DAT.

7. ROOT CHARACTERISTICS

8. SRI recorded higher root length compared to standard method at all stages of crop growth • SRI recorded root volume of 13.3 cc at tillering, 22.2 cc at PI, 33.7 cc at flowering, and 32.5 cc at maturity • Higher root biomass was measured of 1840 kg/ha at PI, 2813 kg/ha at flowering, and 2360 kg/ha at maturity -- compared to standard methods • At tillering stage, standard methods recorded higher root biomass of 679 kg/ha compared to 334 kg/ha in SRI method

9. PHYSIOLOGICAL PARAMETERS

10. SRI system recorded 1.82 LAI at tillering, 3.65 LAI at PI, and 4.44 at flowering, while standard methods recorded 4.40, 4.78 and 4.16 LAI in the respective stages • SRI recorded higher crop growth rate of 36.95 g m-2 day-1 at flowering phase, and 3.23 g m-2 day-1 at maturity phase • The net assimilation rate was 0.026 mg cm-2 day-1 at flowering phase, and 0.04 mg cm-2 day-1 at maturity phase

11. MICROBIAL POPULATION AT FLOWERING STAGE (no. of CFU g-1) • SRI system of rice cultivation recorded higher microbial population of 4.2 x 104 (fungi), 1.4 x 107 (heterotrophic bacteria), 2.9 x 106 (fluorescent pseudomonades), and 6.8 x 106 (phosphobacteria) • Rice grown with standard methods recorded 2.1 x 104 (fungi), 1.4 x 107 (heterotrophic bacteria), 1.6 x 106 (fluorescent pseudomonades), and 6.3 x 106 (phosphobacteria ) at flowering stage.

12. SOIL CHARACTERISTICS * available nutrients

13. YIELD-CONTRIBUTING ATTRIBUTES Among the yield parameters, panicle length, panicle weight, spikelets/panicle, and filled grains/panicle recorded higher values in SRI (23.05 cm, 2.88 g, 240, and 189) compared to 21.87cm, 2.54g, 227 and 127 with standard methods of transplanting.

14. YIELD CHARACTERISTICS

15. Efficiency of natural resources by CORH 3 in SRI method of cultivation

16. Key factors Young seedling Square planting Operation of conoweeder and Churning of the soil

17. CONCLUSION • SRI method of rice cultivation is an efficient in natural resource utilization, especially with CORH 3

18. THANK YOU