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Fertilizer recommendations based on soil-nitrogen levels - a total nutrient model by Smith, Joyotee, Umali, Gloria

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Soil Nitrogen and Fertilizer Recommendations for Irrigated Rice in the Philippines by Smith, Joyotee, Neue, H.U., Umali, Gloria

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Risk and nitrogen use on rainfed rice: Bicol, Philippines by Smith, Joyotee, Umali, Gloria, Rosegrant, Mark W., Mandac, A. M.

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