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Northern Vietnam

Red River Delta and Nearby Regions

 

 

 

Team Leader

Dr. Tran Thuc Son

Vice Director and Soil Scientist

National Institute for Soils & Fertilizers

Hanoi

Email: tsonnisfacvn@hn.vnn.vn
     

Site Characteristics

 

Research and Training Sites

Development of SSNM recommendation based on soil type (1998-2004)

SSNM evaluation and nutrient omission plot experiments were conducted in five soil types in five different provinces of the RRD (Fig.1).

 

 

 

 

 

 

 

 

Wider-scale evaluation and promotion of SSNM (2005 onward)

Wider-scale evaluation and promotion of SSNM started in 2005, with the addition of more sites (provinces) extending even beyond the RRD (Fig. 2).  In eight of eleven provinces, activities in 2005 included both research (LCC demonstration, nutrient omission plots) and training of trainers (TOT). In three provinces, activities focused only on TOT.

 

  

Fig. 1. Map showing the locations (provinces) for SSNM evaluation and nutrient omission plot trials for developing recommendations based on soil type, 1998–2004.

 

Fig. 2. Map showing the provinces for wide-scale evaluation and promotion of SSNM in 2005.

The Red River Delta (RRD) accounts for about 20% of the national rice production in Vietnam and rice produced there is mainly used for local consumption. In 2002, the total harvested rice area in the RRD was about 1.2 million hectares, mostly found in the lowlands along the Red River and in coastal regions. The total rice production was 6.7 million tons, which corresponds to an average yield of 5.6 t ha−1.

 

There are two rice-growing seasons per year:

§    Spring season (early rice) from February to June. This is the high-yielding season and rice is established by transplanting.

§    Summer season (late rice) from June to September. Yield in this season is usually lower because the crop is often affected by heavy rainfall or storms. Farmers usually grow short-duration varieties to be able to grow a non-rice winter crop (i.e., maize or soybean) after summer rice.

 

The climate in the RRD is subtropical, characterized by a cool winter season and a hot and humid summer. Rainfall averages about 1700 mm per year, mostly occurring from May to September.

 

The major soil types in the RRD are alluvial, acid sulfate, alluvial gley, degraded, and marine saline.

 

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