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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

Heilongjiang, China

					Team Leader   Prof. Yuanying Liu Resource and Environment College Northeast Agriculture University Harbin 150030 Heilongjiang Province China
Site Characteristics Heilongjiang Province is located in the northeast of China. It has 12 million hectares (ha) of cultivated land, of which 1.8 million ha was used for growing irrigated rice in 2005. Heilongjiang Province is important for commercial rice production at the national level because up to 60% of total rice production is exported to other provinces.

The climate in Heilongjiang province is cool, with the temperature varying greatly between day and night. Annual precipitation ranges from 400−600 mm in rice planting areas. Due to climate limitation, only one rice crop can be grown per year—single rice with Japonica cultivars of about 120- to 145-day growth duration.

Two major rice soil types are found in Heilongjiang Province:

• Soils derived from alluvial deposits. These soils mainly occur in the Sanjiang Plains in the northeast of the province, and usually have high organic matter content and fertility.
• Soils derived from albic deposits. These soils (called alb-boreal luvisols) belong to the medium or low-yielding rice soils, mainly distributed in the southeast of the province.
 

Development and Evaluation of SSNM

Research on the development of SSNM was conducted in pilot villages near the city of Harbin from 2004-06. Activities in 2005-06 included research on nitrogen use efficiency and optimizing N management for transplanted rice near Harbin, as well as extension and evaluation of SSNM to other locations in the province.

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