HOME | ABOUT US | COUNTRY LOCATIONS | PUBLICATIONS | DONORS | PARTNERS | FAQs | CONTACT US

• 
  • SSNM approach
  • SSNM in three steps
  • Initial concept of SSNM
  • Current version of the SSNM approach
• 
  • 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
• 
  • 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
• 
• 
  • Bangladesh
  • China
  • India
  • Indonesia
  • Myanmar
  • Philippines
  • Vietnam
• 
• 
• 
• 
• 
• 
• 
• 
  • Introduction to SSNM version 1.1
  • N management
  • P&K management
  • Implementing SSNM recommendations
  • Making an SSNM recommendation for rice
• 
• 
  • SSNM: an approach for optimizing nutrient use in intensive rice production
• 
  • Nutrient omission plot
  • Potassium addition plot
  • Zinc addition plot

Guangdong, China

					Team Leader   Dr. Xuhua Zhong Rice Research Institute Guangdong Academy of Agricultural Sciences Wushan, Guangzhou 510640, China Email: xzhong1@pub.guangzhou.gd.cn
Site Characteristics Guangdong Province is located in the southeast of China’s mainland where it occupies an area of 178,000 km2. Two rice-growing seasons are practiced in Guangdong: • Early rice from March to July, with inbred or hybrid cultivars. • Late rice from July to November, with inbred or hybrid cultivars.

Rice is established by either transplanting or seedling throwing. The climate is subtropical with warm temperatures and adequate rainfall (annual mean precipitation = 1366 mm).

Rice occupies 2.14 million hectares (ha) of planting area in Guangdong Province, mainly planted in the plains near the Zhujiang, Hanjiang, Jianjiang, and Nanduhe Rivers, and in basins in hilly regions. Huiyang, Jiangmen, Guangzhou, and Zhaoqing are the main districts for rice cropping, with planting area of more than 220,000 ha. 

Development and Evaluation of SSNM

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

back to top