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An Assessment of the Site-Specific Nutrient Management (SSNM) Strategy for Irrigated Rice in Asia

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  • Divina Gracia P. Rodriguez

    (Norwegian Institute of Bioeconomy Research, 1430 Ås, Norway)

Abstract

The site-specific nutrient management (SSNM) strategy provides guidelines for effective nitrogen, phosphorus and potassium management to help farmers make better decisions on fertilizer input and output levels in rice ( Oryza sativa ) production. The SSNM fertilizer recommendations are based on the yield goal approach, which has been frequently cited in empirical studies. This study evaluates the assumptions underlying the SSNM strategy for rice in the top rice-producing countries around the world, including India, Indonesia, the Philippines, Thailand, and Vietnam. Using a generalized quadratic production function, I explore whether major nutrients are substitutes as inputs and if there are complementarities between inorganic fertilizer and soil organic matter (SOM). The results suggest the relationships among major nutrients vary across sites—some inputs are complements, some are substitutes, and some are independent. The SOM also significantly affects the nitrogen fertilizer uptake. I conclude by suggesting that the SSNM strategy can be made to be more adaptive to farmer’s fields if these relationships are accounted for in the fertilizer recommendation algorithm.

Suggested Citation

  • Divina Gracia P. Rodriguez, 2020. "An Assessment of the Site-Specific Nutrient Management (SSNM) Strategy for Irrigated Rice in Asia," Agriculture, MDPI, vol. 10(11), pages 1-28, November.
    • Handle: RePEc:gam:jagris:v:10:y:2020:i:11:p:559-:d:447946
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    References listed on IDEAS

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