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  • SSNM approach
  • SSNM in three steps
  • Initial concept of SSNM
  • Current version of the SSNM approach
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  • Principles of N management
  • Background on making an N Recommendation
  • Using the SSNM approach to formulate locally adapted N recommendation
  • Using the Leaf Color Chart (LCC) for fertilizer N management
  • FAQs on N Management
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  • Principles of P and K management
  • Background on making P and K recommendations
  • Using SSNM approach to formulate P recommendations
  • Using SSNM approach to formulate K recommendations
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  • Bangladesh
  • China
  • India
  • Indonesia
  • Myanmar
  • Philippines
  • Vietnam
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  • Introduction to SSNM version 1.1
  • N management
  • P&K management
  • Implementing SSNM recommendations
  • Making an SSNM recommendation for rice
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  • SSNM: an approach for optimizing nutrient use in intensive rice production
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  • Nutrient omission plot
  • Potassium addition plot
  • Zinc addition plot

West Java, Indonesia

§         ‘Real-time’ N management: Farmers monitor the rice leaf color at regular intervals of about 7 to 10 days and then apply fertilizer N whenever the leaves become more yellowish-green than the critical threshold value indicated on the LCC.

§         ‘Fixed-time/adjustable dose’ N management: The time for N fertilization is preset at critical growth stages, and farmers adjust the dose of N upward or downward based on the leaf color.

Locally adapted SSNM recommendations with the two options for N management are available for transplanted rice at the links below.

SSNM recommendation for transplanted rice: Real-time N management

Version 2.0 [PDF 181kb]

SSNM recommendation for transplanted rice: Fixed-time N management

Version 2.0 [PDF 195kb]

The two options differ in frequency of visiting the field and measuring leaf color, but they are equally effective if properly implemented. The selection of the option can be based on farmer preferences and location-specific factors, such as frequency of visits by farmers to their fields and farmers’ knowledge of critical growth stages for N application. The fixed-time/adjustable-dose option is less time consuming. The real-time option requires less understanding of the critical growth stages for optimal timing of fertilizer N.

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