Paddy and Water Environment

, Volume 9, Issue 1, pp 53–64 | Cite as

A review of studies on SRI effects on beneficial organisms in rice soil rhizospheres

  • Iswandi Anas
  • O. P. Rupela
  • T. M. Thiyagarajan
  • Norman Uphoff
Review

Abstract

This communication reports on separate research efforts in India and Indonesia to evaluate the effects that modifying methods of plant, soil, water and nutrient management could have on populations of soil organisms, particularly on those that can have beneficial consequences for crop growth and yield. Comparison of these parallel studies (Table 7) draws attention to the impacts that management can have on the soil biota, given that certain organisms are known to have positive implications for plants’ nutrition, health, and productivity. Data from the three studies show SRI management associated with some significant differences in soil microbial populations; higher levels of enzyme activity in SRI plant rhizospheres, indicative of increased N and P availability; and more soil microbial C and N, which would enlarge the nutrient pool for both plants and microbes. The studies reported, although more exploratory than conclusive, show enough similarity to suggest that SRI practices, which make paddy soils more aerobic and enhance soil organic matter, are supportive of enhanced populations of beneficial soil organisms. If this relationship is confirmed by further assessments, it could help researchers and practitioners to improve paddy production in resource-conserving, cost-effective ways. This review was written to encourage more studies to assess these kinds of soil biotic relationships and dynamics.

Keywords

Agriculturally beneficial soil microbes Microbial biomass carbon Microbial biomass nitrogen Phosphate-solubilizing microorganisms Rhizosphere Root mass Root length density Soil biology System of rice intensification (SRI) 

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Copyright information

© Springer-Verlag 2011

Authors and Affiliations

  • Iswandi Anas
    • 1
  • O. P. Rupela
    • 2
  • T. M. Thiyagarajan
    • 3
  • Norman Uphoff
    • 4
  1. 1.Soil Biotechnology LaboratoryBogor Agricultural University (IPB)BogorIndonesia
  2. 2.ICRISATPatancheruIndia
  3. 3.Tamil Nadu Agricultural UniversityCoimbatoreIndia
  4. 4.Cornell International Institute for Food, Agriculture and DevelopmentIthacaUSA

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