STUDY ON SITESPECIFIC NUTRIENT （研究SITESPECIFIC营养）.pdfVIP

Omonrice 15: 144-152 (2007) STUDY ON SITE-SPECIFIC NUTRIENT MANAGEMENT (SSNM) FOR HIGH-YIELDING RICE IN THE MEKONG DELTA Chu Van Hach and Pham Sy Tan Cuu Long Delta Rice Research Institute, Can Tho, Vietnam ABSTRACT The study was conducted in two seasons (Dry and Wet season) at three soil series (alluvial, acid sulfate, and saline-acid sulfate soil) in the Mekong Delta. The results of study showed that: SSNM provided an increase in grain yield about 0.5 t/ha and gave higher benefit than FFP. Fertilizer rate as estimated by SSNM is almost met the requirement of crop, therefore it could save nutrients, especially nitrogen which was applied too high by farmers. SSNM is a simple technique that farmers can be easily applied. FERTILIZER USING IN THE MEKONG DELTA: A REALITY Total amounts of inorganic fertilizers consumption for rice crop in the Mekong Delta area are around 400,000 tones of nitrogen, 180,000 tones of phosphorus, and 120,000 tones of potassium yearly. Most of these are imported and only small quantity is produced in the country (Pham 2005). Fertilizer use efficiency is low due mainly to losses through volatilization, leaching, run off etc. The amount of fertilizer losses is around 1.2-1.3 M tons out of the total fertilizer application (2 M tons) (Nguyen 2002). In fact, fertilizers consumption is varied depending on rice variety, soil condition and farmer practices. Although, there are specified fertilizer recommendations for each soil type but still practice as their ways. Nitrogen fertilizer recommendation for specific rice regions are proposed for areas of Tien and Hau rivers, nitrogen fertilizer dose ranges from 100 to 120 kg N/ha in dr