Plant and Soil

, Volume 370, Issue 1, pp 59–71

Differential responses of system of rice intensification (SRI) and conventional flooded-rice management methods to applications of nitrogen fertilizer

  • Amod Kumar Thakur
  • Sreelata Rath
  • Krishna Gopal Mandal
Regular Article

DOI: 10.1007/s11104-013-1612-5

Cite this article as:
Thakur, A.K., Rath, S. & Mandal, K.G. Plant Soil (2013) 370: 59. doi:10.1007/s11104-013-1612-5

Abstract

Background

Rising food demand, slowing productivity growth, poor N-use efficiency in rice, and environmental degradation necessitate the development of more productive, environmentally-sound crop and soil management practices. The system of rice intensification (SRI) has been proposed as a methodology to address these trends. However, it is not known how its modified crop-soil-water management practices affect efficiency of inorganic nitrogen applications.

Methods

Field experiments investigated the impacts of SRI management practices with different N-application rates on grain yield, root growth and activity, uptake of N and its use-efficiency, leaf chlorophyll content, leaf N-concentration, and photosynthetic rate in comparison with standard management practices for transplanted flooded rice (TFR).

Results

Overall, grain yield with SRI was 49 % higher than with TFR, with yield enhanced at every N application dose. N-uptake, use-efficiency, and partial factor productivity from applied N were significantly higher in SRI than TFR. Higher leaf nitrogen and chlorophyll contents during the ripening-stage in SRI plants reflected delayed leaf-senescence, extension of photosynthetic processes, and improved root-shoot activities contributing to increased grain yield.

Conclusions

Rice grown under SRI management used N fertilizer more efficiently due to profuse root development and improved physiological performance resulting in enhanced grain yield compared to traditional flooded rice.

Keywords

Cultivation practices Grain yield Nitrogen use efficiency Oryza sativa Root growth System of rice intensification 

Abbreviations

SRI

System of rice intensification

TFR

Transplanted flooded rice

AWD

Alternate wetting and drying

ANUE

Agronomic nitrogen use efficiency

PFP

Partial factor productivity

CP

Cultivation practice

MG

Milk grain

LR

Late ripening

Copyright information

© Springer Science+Business Media Dordrecht 2013

Authors and Affiliations

  • Amod Kumar Thakur
    • 1
  • Sreelata Rath
    • 1
  • Krishna Gopal Mandal
    • 1
  1. 1.Directorate of Water ManagementBhubaneswarIndia