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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
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  • 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

Iloilo, Western Visayas, Philippines

			Team Leader   Dr. Greta Gabinete Assistant Professor College of Agriculture and Forestry West Visayas State University, Lambunao, Iloilo Email: gggabinete1@yahoo.com
Site Characteristics   The Province of Iloilo occupies the southern and northeastern portion of Panay Island. It has a total land area of 466,342 hectares, of which 74% is classified as agricultural lands. Iloilo is the largest rice producing province in the Western Visayas region, which ranks second in rice production in the country. In 2005, the total land area cropped to rice was 230,000 ha, of which about 54% is irrigated. The average yield for irrigated areas was 3.3 t ha−1 in 2005.   The Province has two pronounced seasons; a dry season from November to April and a wet season during the rest of the year.

 The mean annual rainfall is about 1600 mm. Generally, two rice crops are grown in the irrigated areas of the province:

§         First crop (wet season): April/May to August/September (high yielding season)

§         Second crop (dry season): September/October to December/January (low yielding season)

Both direct seeding and transplanting are practiced in both seasons.

Development and Evaluation of SSNM Strategies

Research on the development of an SSNM recommendation was conducted in 2005−06 with 56 farmer cooperators on Sta. Rita and Alimodian soils. The nutrient omission plot technique was used in the farmers’ fields to determine the attainable and nutrient-limited yields for both the wet and dry season. A preliminary evaluation of an SSNM recommendation was conducted in the dry season with 14 farmers to compare the SSNM performance with farmers’ practice.

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