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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

Jiangsu, China

				Team Leader   Dr. Jianchang Yang Yangzhou University Yangzhou, Jiangsu China Email: yangjianchang@yahoo.com Email: yz.zp@public.yz.js.cn Email: yangjianchang@hotmail.com
Site Characteristics   Jiangsu Province is located at the central part of the eastern coast of China. It covers a total area of 102,600 km2. Rice is grown once a year, from May to October, in rotation with wheat or oilseed rape. Most rice production in Jiangsu involves manual transplanting of Japonica cultivars. Labor-saving crop establishment techniques of mechanical transplanting, seedling throwing, and direct wet-seeding are increasing in importance. In 2006, about 15% of the rice production used seedling throwing, and about 10% used mechanical transplanting for establishment of Japonica cultivars. About 10% of the rice production used direct wet-seeding for establishment of Japonica cultivars.

The climate is subtropical with warm temperatures and an annual precipitation of 800–1200 mm. Rice soils in Jiangsu include clay loam soils near Wuxi in the south, sandy loam soils near Yangzhou in the middle, and saline-clay soils in the north near Lianyungang.

Development and Evaluation of SSNM

On-farm trials were conducted in 2003-05 to evaluate N management options and determine nutrient-limited yields through the nutrient omission plot technique. The evaluation of N management options was initially conducted using the chlorophyll (SPAD) meter. Beginning in 2004, the four-panel IRRI leaf color chart (LCC) was included in the development of improved N management practices.

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