Fertilizer guide · Bangladesh

Betel nut (Supari): 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 Betel nut (Supari) tree (1–2 years) about 261 g of urea, 598 g of TSP and 271 g of MOP (potash) a year. A fully grown one (over 11 years) needs about 707 g of urea, 1,494 g of TSP and 653 g of MOP a year. Put the yearly dose on in 2 equal turns: مايو وسبتمبر–أكتوبر.

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 3 kg of dry nuts per tree (for a tree over 11 years old)

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)01490618 · – · –
1–2 years old261598271––
3–5 years old380822362536 · – · –
6–8 years old4891,046462742 · – · –
9–11 years old5981,270562748 · – · –
Over 11 years old7071,4946531054 · – · –

Source: BARC, Fertilizer Recommendation Guide 2024, page 147.

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 2 equal turns: مايو وسبتمبر–أكتوبر.

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

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How much urea does a Betel nut (Supari) tree need?

According to BARC's Fertilizer Recommendation Guide 2024, about 261 g a year for a young tree (1–2 years), rising to about 707 g for a fully grown tree (over 11 years). The dose goes up with the age of the tree.

How much TSP and MOP does a Betel nut (Supari) tree need?

About 598 g of TSP and 271 g of MOP a year for a young tree (1–2 years), and about 1,494 g of TSP and 653 g of MOP for a fully grown tree (over 11 years), according to BARC's Fertilizer Recommendation Guide 2024.

When should I put fertilizer on Betel nut (Supari)?

Put the yearly dose on in 2 equal turns: مايو وسبتمبر–أكتوبر. 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