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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

Central Vietnam

SSNM recommendation for wet-seeded rice in spring

Version 1 [PDF 151kb]

SSNM recommendation for wet-seeded rice in summer

Version 1 [PDF 149kb]

Results obtained with the nutrient omission plot technique and interviews of farmers were used to develop locally adapted recommendations for managing N, P, and K. These tentative recommendations assume an attainable target yield of 6 to 6.5 t ha⁻¹ in both spring and summer seasons. They provide two options for N management. A relatively low application of fertilizer N is recommended for fields with relatively fertile soil and low response (≤1.5 t ha⁻¹) to fertilizer N, and a relatively higher application of fertilizer N is recommended for fields with relatively lower soil fertility and high response (≥2 t ha⁻¹) to fertilizer N. In 2005, all trial sites in Quang Nam had high response to fertilizer N, whereas sites in Thua Thien-Hue varied with both high and low response to fertilizer N (Tables 1 and 2).

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