This article encompasses nutrient diagnosis through leaf analysis and leaf nutrient composition. The corresponding leaf nutrient values expressed in % were: N (2.23–2.49), P (0.10–0.11), K (1.86–2.12), Ca (2.12–2.32), Mg (0.28–0.38), and in ppm Fe (148.2–179.8), Mn (72.2–84.8), Cu (10.4–18.6), and Zn (24.2–38.8) representing eight states viz., West Bengal, Sikkim, Assam, Meghalaya, Tripura, Mizoram, Arunachal Pradesh, and Manipur. Nutrient constraints in the form of nitrogen, phosphorus, calcium, magnesium, copper and zinc through leaf nutrient diagnostics tools were diagnosed. It finds a due place in the region’s fertilizer program of mandarin orchards to obtain sustainable optimum fruit yield. While through leaf analysis in Manipur, DRIS indices revealed different nutrients to be ordered as zinc < phosphorus < calcium < magnesium < nitrogen < potassium < iron < manganese < copper.

Globally, citrus is one of the essential fruit crops being cultivated in an area of 3.35 million ha, with a total production of 91 million tons. The current average productivity of citrus orchards in India is 8.9 tons ha-1 compared to 4.52 tons ha-1 obtained in northeast India [1–6]. The region is historically believed to have witnessed the citrus distribution to other parts of the globe.

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L. Devarishi Sharma, Indira Sarangthem, Rahul Sadhukhan, Rojeet Thangjam, Y. Herojit Singh, C.G. Sawant, Lalhmingsanga, R. Lalrinfeli
Research & Reviews: A Journal of Agricultural Science and Technology