1. Temporal Variations in Leaf Nutrient Concentrations and Photosynthetic Nutrient Use Efficiency in Durian

This study assessed leaf nutrient concentration in durian leaves and evaluated the photosynthetic use efficiency of nitrogen (N), phosphorus (P), and potassium (K) on durian trees over two fruiting seasons. This study also provided nutrient recommendations for durian fertilization using the Diagnosis and Recommendation Integrated System (DRIS) and optimal nutrient management range. A total of 63 mature trees were selected for leaf sampling. All samples were collected at two growth stages in each... M.F. Omar, S.K. Balasundram, N.E. tajidin