HOME | ABOUT US | COUNTRY LOCATIONS | PUBLICATIONS | DONORS | PARTNERS | FAQs | CONTACT US

• 
  • SSNM approach
  • SSNM in three steps
  • Initial concept of SSNM
  • Current version of the SSNM approach
• 
  • 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
• 
  • 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
• 
• 
  • Bangladesh
  • China
  • India
  • Indonesia
  • Myanmar
  • Philippines
  • Vietnam
• 
• 
• 
• 
• 
• 
• 
• 
  • Introduction to SSNM version 1.1
  • N management
  • P&K management
  • Implementing SSNM recommendations
  • Making an SSNM recommendation for rice
• 
• 
  • SSNM: an approach for optimizing nutrient use in intensive rice production
• 
  • Nutrient omission plot
  • Potassium addition plot
  • Zinc addition plot

Mekong River Delta, Vietnam

The rates of fertilizer P₂O₅ as determined from nutrient omission plots may have to be adjusted depending upon previous use of fertilizer P and water management. The rate of fertilizer P in both seasons is increased by 10 kg P₂O₅ ha⁻¹ if the amount of fertilizer P used in previous seasons was <30 kg P₂O₅ ha⁻¹. The fertilizer P rate in the wet season is increased for fields that are not continuously flooded and undergo alternate soil drying and wetting. Table 4 gives the recommended rates of fertilizer P₂O₅ for alluvial soil. Rates would be higher for acid sulfate soil.

Table 4. Adjustments in the SSNM recommended rates of fertilizer P₂O₅ for alluvial soil based on previous fertilizer P use and water management during the dry season.

Locally adapted SSNM recommendations for wet-seeded rice with growth durations of 95 to 100 days and 90 days in both dry and wet seasons are available at the links below. 

SSNM recommendation for wet-seeded rice with growth duration of 95 to 100 days

Version 1 [PDF 159KB]

SSNM recommendation for wet-seeded rice with growth duration of 90 days

Version 1 [PDF 158KB]

back to top