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Interpretive Summaries:
2003 - Site-specific Nutrient Management Extension Project for Rice
2002 - Site-Specific Nutrient Management Extension Project
2001 - Site-Specific Nutrient Management in Rice
Site-Specific Nutrient Management Extension Project, 2002
The Government of Indonesia (GoI) recognizes the need to increase productivity in its 12 million hectares (M ha) of lowland irrigated rice through the implementation of balanced fertilization and incorporation of the site-specific nutrient management (SSNM) technology developed in the Reaching Towards Optimum Productivity (RTOP) project (ESEA-01, RTOP). Two sites were selected to test the RTOP technology in farmers’ fields in Indonesia. Omission plots were installed to measure the indigenous supply of nitrogen (N), phosphorus (P) and potassium (K) and the response to NPK fertilizer nutrients. In central Java, potential annual yield in triple-cropped rice fields exceeds 20 t/ha. In the 2001 dry season, yield was 5.34 t/ha where N was omitted, 8.1 t/ha (P omitted), 8.0 t/ha (K omitted), and 8.7 t/ha when a balanced supply of N, P, and K was applied. The largest response was to N fertilizer, but the response to P and K was highly significant since a small increase in yield over the large area of irrigated rice in Indonesia can eliminate the requirement for rice imports. Presently, most farmers apply large amounts of N, variable rates of P but only small amounts of K fertilizer.
Implementation of balanced fertilization in lowland irrigated rice, particularly with regard to K, is thus a key component of food security in Indonesia. Key recommendations include more widespread implementation of omission plots to determine P and K requirements and the mapping of application domains based on the results of omission plots, soil testing, farming system characterization, and potential yield. In 2003, the pocket guide for nutrient management in rice, produced jointly by the International Rice Research Institute (IRRI) and PPI/PPIC, will be translated and reproduced in Bahasa Indonesia for distribution to all Assessment Institutes for Agriculture Technology in Indonesia. INDO-24-PHSL Padi
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