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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

Hunan, China

					Team Leader   Prof. Yingbin Zou Rice Research Institute Hunan Agricultural University Furong District Changsha China Email: zouyingbin@263.net
Site Characteristics Hunan is an inland province in central China with a total land area of 211,800 km2. Hunan Province ranks first in rice production among provinces in China.     Two main rice-based cropping systems are practiced in Hunan:

• Double rice cropping with early rice grown from April to July and with late rice grown from July to October. Inbred or hybrid cultivars are grown in the early rice season, whereas hybrid cultivars are typically grown in the late rice season.
• Single rice cropping with a long-duration cultivar grown from April to September in rotation with an upland crop such as oilseed rape.
 

Rice is typically transplanted, although interest in direct wet-seeding to reduce labor costs is increasing, especially for single rice and early rice in the northern part of Hunan Province. The climate is subtropical with warm temperatures and adequate rainfall (annual precipitation = 1100−1900 mm).

Development and Evaluation of SSNM

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

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