0210 A Review of the System of Rice Intensification (SRI)

A Review of the System of Rice Intensification (SRI) Norman Uphoff Cornell International Institute for Food, Agriculture and Development for presentation in Mymensingh, September 25, 2002

SRI IS A “WORK IN PROGRESS” ,[object Object],[object Object],[object Object],[object Object],[object Object]

SRI IS A METHODOLOGY ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

The basic idea of SRI is that RICE PLANTS GROW BEST ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

“ Starting Points” for SRI ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

OBSERVABLE RESULTS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

LESS OR NO NEED FOR: ,[object Object],[object Object],[object Object]

FURTHER BENEFITS ,[object Object],[object Object],[object Object],[object Object],[object Object]

DISADVANTAGES / COSTS ,[object Object],[object Object],[object Object]

SRI is COUNTERINTUITIVE ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

These are remarkable claims ,[object Object],[object Object],[object Object],[object Object]

BACKGROUND ,[object Object],[object Object],[object Object],[object Object]

Spread beyond Madagascar ,[object Object],[object Object],[object Object],[object Object],[object Object]

Participants at the SRI Conference in Sanya, China

SIX PROPOSED EXPLANATIONS ,[object Object],[object Object],[object Object]

Evidence on Root System Development/Degeneration ,[object Object],[object Object],[object Object]

Dry Matter Distribution of Roots in SRI and Conventionally-Grown Plants at Heading Stage (CNRRI research: Tao et al. 2002) Root dry weight (g)

Root Activity in SRI and Conventionally-Grown Rice (Nanjing Agr. Univ. research: Wang et al. 2002) (Wuxianggeng 9 variety)

(2) Tillering in rice is regulated by structural pattern of growth ,[object Object],[object Object],[object Object]

What speeds up the biological clock? (adapted from Nemoto et al. 1995) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

(3) Profuse tillering should not be considered unproductive ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

With a large and intact root system and profuse tillering ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

This is what makes it possible to go from 2 t/ha to 8 t/ha ,[object Object],[object Object],[object Object]

(4) Positive benefits are seen from soil aeration during the vegetative growth period

(5) SRI capitalizes on the fact that the uptake of N is a demand-led process

Paths for Increased Grain Yield in Relation to N Uptake, using QUEFTS Analytical Model (Barison, 2002)

Rapid tillering and root growth ,[object Object],[object Object],[object Object]

(6) The contributions of soil microbial activity are likely the foundation for SRI success ,[object Object]

Biological Nitrogen Fixation? ,[object Object],[object Object],[object Object],[object Object]

P SOLUBILIZATION? ,[object Object],[object Object],[object Object]

MYCORRHIZAL Contributions? ,[object Object],[object Object],[object Object]

Benefits from Rhizobia in rice now being explored ,[object Object],[object Object],[object Object]

ROOT EXUDATION ,[object Object],[object Object]

Larger canopies and root systems increase exudation and rhizodeposition ,[object Object],[object Object],[object Object],[object Object]

SRI Raises More Questions than It Gives ANSWERS ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Plant Physical Structure and Light Intensity Distribution at Heading Stage (CNRRI Research: Tao et al. 2002)

Suggested Focuses for Explanation of SRI Effects ,[object Object],[object Object]

MANY OPPORTUNITIES ,[object Object],[object Object],[object Object],[object Object]

THANK YOU ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

0210 A Review of the System of Rice Intensification (SRI)

Recommended

Recommended

More Related Content

What's hot

What's hot (20)

Similar to 0210 A Review of the System of Rice Intensification (SRI)

Similar to 0210 A Review of the System of Rice Intensification (SRI) (20)

More from SRI-Rice, Dept. of Global Development, CALS, Cornell University

More from SRI-Rice, Dept. of Global Development, CALS, Cornell University (20)

Recently uploaded

Recently uploaded (20)

0210 A Review of the System of Rice Intensification (SRI)