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Mei, Melissa Teng Lok and Ngai, Paing Tan and Yei, Kheng Tee and Boon, Christopher Sung Teh (2024) Review of the innovations and challenges in developing rapid colorimetry and turbidity NPK soil test kits for commercial soil nutrient analysis. Pertanika Journal Tropical Agricultural Science (Malaysia), 47 (4). pp. 1405-1428. ISSN 1511-3701