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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

Zhejiang, China

					Team Leader   Prof. Wang Guanghuo Department of Soil Science and Agricultural Chemistry Zhejiang University Huajiachi, Hangzhou, Zhejiang 310029 China Email: wangguanghuo@hzcnc.com Email: ghwang@mail.hz.zj.cn
Site Characteristics Zhejiang Province is located in the southeast of China, in the southern sector of the Yangtze River Delta. Two main rice-based cropping systems are practiced in Zhejiang: §         Double rice with two rice crops per year: This system is common in central and southern Zhejiang with early rice grown from early April to July and late rice grown from mid July to late October. Inbred cultivars are usually grown in the early rice season, whereas hybrid cultivars are grown in the late rice season.
§         Single rice, also referred to as middle rice, with one rice crop per year: A hybrid Indica cultivar with about 135−140 day growth duration is grown from late May to early October at central and southern Zhejiang. A Japonica cultivar (hybrid or inbred) with about 155−160 day growth duration is grown from late May to the end of October or early November at northern Zhejiang, which may or may not be followed by a winter crop.

The climate is subtropical with warm temperatures and annual precipitation of 1100−1900 mm. Three main types of rice soils are found in Zhejiang:

§         Soils derived from alluvial deposits (40% of rice area). These soils occur in the valley plains along the upper and middle reaches of various rivers in Zhejiang. These soils vary greatly in terms of fertility and productivity.

§         Soils derived from lacustrine deposits, marine deposits, or alluvial-marine deposits (40% of rice area). These soils are found in coastal areas and river deltas, and usually have high organic matter content and fertility.

§         Various red soils (20% of rice area). Because of the relative low fertility of their parent materials, these soils belong to the medium- or low-yielding rice soils.

Development and Evaluation of SSNM

Research on the development of SSNM was conducted in pilot villages from 1997–2000 near the city of Jinhua in the central part of this province—in the Jinhua-Quzhou (Jin-Qu) Basin with about 395,000 ha irrigated rice land. The Jin-Qu Basin is important for commercial food production, not only at the provincial but also at the national level. Activities in 2001−2004 included research on N use efficiency and optimizing N management for direct wet-seeded early rice conducted in Jinhua, as well as extension and evaluation of SSNM to other locations in the province.

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