Scientists, through research in major rice-growing areas across Asia, established the scientific basis for a new concept.

The demand of a rice crop for essential nutrients is established by setting a yield target well-matched to local climatic and crop-growing conditions. The crop’s need for supplemental nutrients is determined from the gap between the crop's demand for nutrients and the supply of these nutrients from existing native sources, including soil, crop residues, organic materials, and irrigation water.

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