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Agro Fertilizer Division  
 
Fertilizer for Rubber Cultivation  

Rubber fertilisers essentially consist of Nitrogen (N), Phosphorous (P), Potassium (K) and Magnesium (Mg). These fertiliser mixtures are categorised according to their base, Urea and Sulphate of Ammonia. The rubber growing soils of Sri Lanka are divided into three categorie

 
Year of planting Frequency & time of Application Quantity per Tree
Urea Based Sulphate of Ammonia Based
At planting per hole   50g NPK mixture+100g IRP+25/10g kie 100g NPK mix + 100g IRP
1st year 4 applications/ year   450g NPKMg mix
2 months after planting 50g NPK mix. +25g kie 75g NPKMg mix
5 months after planting 50g NPK mix. 100g NPKMg mix
7  months after planting 75g NPK mix. +50/ 25g kie 125g NPKMg mix
10 months after planting 100g NPK mix. 150g NPKMg mix
2nd year 4 applications/ year

550g NPK mix. + 150/75g* dol

 900g NPKMg mix
13 months after planting 100g NPK mix 150g NPKMg mix
14 months after planting 150/75g dol  
16 months after planting 150g NPK mix 250g NPKMg mix
19 months after planting 150g NPK mix 250g NPKMg mix
22 months after planting 150g NPK mix 250g NPKMg mix
3rd year 3 applications/ year 800g NPK mix. +200/100g *dol Once in 3 months
26 months after planting 265g NPK mix 1350g NPKMg mix
27 months after planting 200/100g dol 450g NPKMg mix
30 months after planting 265g NPK mix 450g NPKMg mix
34 months after planting 265g NPK mix 450g NPKMg mix
4th year 3 applications/ year 800g NPK mix. +200/100g *dol 1350g NPKMg mix
38 months after planting 265g NPK mix 450g NPKMg mix
39 months after planting 200/100g dol  
42 months after planting 265g NPK mix 450g NPKMg mix
46 months after planting 265g NPK mix 450g NPKMg mix
5th year until tapping 3 applications/ year 1100g NPK mix. +250/150g *dol 1800g NPKMg mix
50 months after planting 365g NPK mix 600g NPKMg mix
51 months after planting 250/150g dol  
54 months after planting 365g NPK mix 600g NPKMg mix
58 months after planting 365g NPK mix 600g NPKMg mix

* Depending on low or high potassium levels in the soils

IRP – imported rock phosphate
Year of planting Frequency & time of Application Quantity per Tree
At planting per hole   75g NPK mixture+100g IRP
1st year 4 applications/ year 375g NPK mix
2 months after planting 50g NPK mix
5 months after planting 75g NPK mix
7  months after planting 100g NPK mix
10 months after planting 150g NPK mix
2nd year 4 applications/ year

750g NPK mix

13 months after planting 150g NPK mix
16 months after planting 200g NPK mix
19 months after planting 200g NPK mix
22 months after planting 200g NPK mix
3rd year 3 applications/ year 1125g NPK mix
26 months after planting 375g NPK mix
30 months after planting 375g NPK mix
34 months after planting 375g NPK mix
4th year 3 applications/ year 1125g NPK mix
38 months after planting 375g NPK mix
42 months after planting 375g NPK mix
46 months after planting 375g NPK mix
5th year until tapping 3 applications/ year 1500g NPK mix
50 months after planting 500g NPK mix
54 months after planting 500g NPK mix
58 months after planting 500g NPK mix

IRP – imported rock phosphate

Manuring schedule for mature rubber on group I, II and III soils

Stage of Maturity Quantity/ tree/ year (group I & III soils) Quantity/ tree/ year (group II soil)
Urea Based Sulphate of ammonia Based

While tapped on virgin bark

 800g NPK mix + 200/ 100g* kie 1250g NPKMg mix 1125g NPK mix
While tapped on renewed bark to five years before uprooting 550g NPK mix +150/ 75g *kie 900g NPKMg mix 750g NPK mix

* Depending on low or high potassium levels in the soils
 

Rubber Fertilizers available at Hayleys Agro

Rubber Mixtures
Urea Based N P K Mg Sulphate of Ammonia Based N P K Mg
RU-462 15 17 06   RYB 13 07 06 0003

RU-462 Mg

 15 14 06 02 RYB 09 12 11 04
RU-463 15 15 09   RA-462 11 11 05  
RU-463 Mg 12 14 07 03 RA-462 Mg 07 12 05 03
RU-465 12 15 14   RA-463 09 12 06  
RU-465 Mg 10 12 12 03 RA-463 Mg 09 11 06 02

R 12.14.14 (ERP)

12

 14 14   RA-465 09 11 11  
R 12.14.14 (IRP) 12 14 14   RA-465 Mg 08 10 11 02
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