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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

Hubei, China

					Team Leader Dr. Jianliang Huang Crop Physiology and Production Center (CPPC) College of Plant Science and Technology Huazhong Agricultural University Wuhan, Hubei 430070 Email: jhuang@mail.hzau.edu.cn
Site Characteristics   Hubei Province is located in central China with a total land area of 185,900 km2. Rice is the most important crop in the province. The planted area for rice production is about 2 million hectares (ha), and Hubei ranks fourth in rice production among provinces in China.   Two rice-based cropping systems are practiced in Hubei:

•    Double rice cropping with early rice from March/April to July and late rice from June to October/November. The average yield for early rice is 6–6.5 t ha⁻¹ per crop. Slightly higher yield is attained in the late rice crop.
•   Single rice cropping with rice planted in April or May and harvested in September/October. A non-rice crop such as oilseed rape is grown in rotation with rice. The average yield for this crop is 8–9 t ha⁻¹.

Rice is commonly transplanted, although interest in direct-seeding is increasing. The climate is subtropical with warm temperatures and adequate rainfall (annual precipitation is 1100–1900 mm).

Development and Evaluation of SSNM

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

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