Fertilizer guide · Bangladesh

Mandarin orange (Komola): how much fertilizer per tree?

Urea, TSP and MOP for each age of the tree, from BARC's Fertilizer Recommendation Guide 2024.

Short answer

BARC's Fertilizer Recommendation Guide 2024 gives a young Mandarin orange (Komola) tree (0–1 years) about 217 g of urea, 149 g of TSP and 161 g of MOP (potash) a year. A fully grown one (over 15 years) needs about 1,087 g of urea, 996 g of TSP and 803 g of MOP a year. Put the yearly dose on in 3 equal turns: February, May, and September.

Komola: the loose-skinned orange (BARI Komola varieties).

Dose for each age

Find the age of your tree in the first column, counted in years since planting. The figures are grams per tree for one year; the first row is the planting pit. For an orchard, multiply by the number of trees and divide by 1,000 to get kilograms, or let the calculator below do it.

Yield goal about 50 kg of fruit per tree (for a tree over 15 years old)

Varieties in this group: BARI Komola-2, BARI Komola-3.

grams per tree
Age of tree (years)Urea (g)TSP (g)MOP (g)Organic manure (kg)S, Zn, B (g)
Before planting (in the pit)029910015–
0–1 years old2171491611020 · 5 · 2
2–4 years old3262492411525 · 8 · 2
5–7 years old4353743622030 · 10 · 3
8–10 years old5434985022540 · 12 · 4
11–15 years old7617476033050 · 15 · 6
Over 15 years old1,0879968033560 · 15 · 8

On very acid soil the guide also adds 250 g of dolomite per tree every 3–4 years.

Source: BARC, Fertilizer Recommendation Guide 2024, page 121.

When to apply

Mix it into the planting pit 10–20 days before planting the sapling, then water it in.

Put the yearly dose on in 3 equal turns: February, May, and September.

Put it around the tree under the spread of its branches, leaving some space from the trunk, mix it into the soil and water it in. Young trees get the same turns with smaller amounts.

Using DAP instead of TSP

DAP has the same 46% phosphate as TSP, so use the TSP figure as the DAP figure. DAP also carries 18% nitrogen (about 0.4 kg of urea saved per kg of DAP). The guide does not subtract it and neither do these tables, but you can take it off the urea if you want to.

How these numbers are worked out

BARC's guide gives grams of nitrogen (N), phosphorus (P) and potassium (K) per tree for each age. We convert P to P₂O₅ (× 2.29) and K to K₂O (× 1.21), then divide by what is in the bag: urea 46% N, TSP 46% P₂O₅, MOP 60% K₂O. The guide's amounts are for the whole year; split them as shown under “When to apply”.

These are the guide's general doses for a healthy, well-managed tree, not a prescription for your orchard. Soil, variety, rainfall and crop load change what a tree needs. Check with your local Department of Agricultural Extension or horticulture officer.

Calculate for your orchard

Choose the crop, the age of your trees and how many you have, and get the kilograms and bags of fertilizer to buy, with a PDF to share.

Open the fertilizer calculator

Fertilizer calculator questions

How much urea does a Mandarin orange (Komola) tree need?

According to BARC's Fertilizer Recommendation Guide 2024, about 217 g a year for a young tree (0–1 years), rising to about 1,087 g for a fully grown tree (over 15 years). The dose goes up with the age of the tree.

How much TSP and MOP does a Mandarin orange (Komola) tree need?

About 149 g of TSP and 161 g of MOP a year for a young tree (0–1 years), and about 996 g of TSP and 803 g of MOP for a fully grown tree (over 15 years), according to BARC's Fertilizer Recommendation Guide 2024.

When should I put fertilizer on Mandarin orange (Komola)?

Put the yearly dose on in 3 equal turns: February, May, and September. Put it around the tree under the spread of the branches, mix it into the soil and water it in.

Fertilizer doses for other crops