Fertilizer guide · Bangladesh

Sweet orange (Malta): 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 Sweet orange (Malta) tree (0–1 years) about 272 g of urea, 199 g of TSP and 151 g of MOP (potash) a year. A fully grown one (over 15 years) needs about 1,043 g of urea, 996 g of TSP and 603 g of MOP a year. Put the yearly dose on in 3 equal turns: fevereiro, maio e setembro.

Sold as malta in Bangladesh (BARI Malta and BAU Malta 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 60 kg of fruit per tree (for a tree over 15 years old)

Varieties in this group: BARI Malta-1, BARI Malta-2, BAU Malta-1.

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)	0	299	100	20	–
0–1 years old	272	199	151	10	20 · 5 · 2
2–4 years old	435	249	181	15	25 · 8 · 2
5–7 years old	543	374	281	20	40 · 10 · 5
8–10 years old	696	498	351	30	50 · 12 · 5
11–15 years old	761	747	452	35	50 · 15 · 8
Over 15 years old	1,043	996	603	40	60 · 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: fevereiro, maio e setembro.

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

Perguntas sobre a calculadora de adubo

How much urea does a Sweet orange (Malta) tree need?

According to BARC's Fertilizer Recommendation Guide 2024, about 272 g a year for a young tree (0–1 years), rising to about 1,043 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 Sweet orange (Malta) tree need?

About 199 g of TSP and 151 g of MOP a year for a young tree (0–1 years), and about 996 g of TSP and 603 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 Sweet orange (Malta)?

Put the yearly dose on in 3 equal turns: fevereiro, maio e setembro. Put it around the tree under the spread of the branches, mix it into the soil and water it in.