Frequently Asked Questions

Can the entire recommended quantity of fertilizers be applied at one time?

Fertilizers should be applied in two split doses during April- May (pre-monsoon) and September–October (post-monsoon), when there is adequate moisture in the soil. However, in mature rubber plantations, if there is acute labour shortage, the entire quantity of fertilizers may be applied at one time.

Is it possible to apply NPK fertilizers and micronutrients together?

Micronutrients are to be applied two weeks after the application of NPK fertilizers. In the absence of adequate soil moisture content, micronutrient application should be postponed till there is adequate soil moisture.

Can we apply factamfos (Ammophos) in rubber plantations?

Factamfos should be applied along with the required quantity of muriate of potash. In immature rubber plantations, magnesium sulphate also should be applied in areas low in magnesium status.

Is it beneficial to apply fertilizers in pits in mature rubber plantations?

No. Rubber is a surface feeder and more than 55 per cent of the total feeder roots of rubber trees are concentrated in the top 10 cm soil layer. Hence it is better to broadcast fertilizer in mature rubber plantations.

Can we skip fertilizer application for mature rubber? Will it affect yield of trees?

The field experiments conducted by Rubber Research Institute of India showed that skipping of fertilizers for a short period in rubber plantations with deep soil and high soil organic carbon content has no adverse effect on yield of rubber plants. Fertilizers are applied to sustain soil health.

Is it advantageous to apply farmyard manure in rubber plantations?

Yes. Integrated nutrient management with dried farmyard manure and fertilizer has been found to enhance growth of rubber plants and improve soil properties.

Is liming in rubber plantations advantageous?

Majority of the rubber growing soils are extremely and very strongly acidic in nature. Liming enhances the availability of soil nutrients and supplement calcium.