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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

Phosphorous and Potassium Management

USING THE SSNM APPROACH TO FORMULATE LOCALLY ADAPTED P RECOMMENDATIONS

The SSNM approach can be used to formulate a P recommendation adapted to any irrigated or favorable rainfed rice environment. Table 3 lists the steps in formulating locally adapted recommendations for high- and low-yielding seasons.

Table 3. Example of P management plans for two contrasting rice-growing seasons. Yield targets depend upon location and can be higher or lower than those in this example.

Step 1: Estimate an attainable yield target. This is the yield attainable by farmers with good management practices and under average climatic conditions.

Step 2: Estimate the P-limited yield or yield without fertilizer P.

Step 3: Estimate the total fertilizer P₂O₅ required based on the yield target and P-limited yield from Table 1. Total fertilizer P₂O₅ requirement can also be determined with the nutrient decision support system (NuDSS).

Step 4: Apply all fertilizer P₂O₅ to young rice within 14 DAT or 21 DAS.

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