Reasonable fertilization of rubber trees can accelerate the growth rate of rubber trees and increase the yield of latex. Fertilization should be based on five aspects of different biological ages.

1. Types of fertilizer:

Fertilization should be based on organic fertilizers, supplemented by chemical fertilizers, or mixed with organic fertilizers and special rubber fertilizers.

2. Number of fertilizers:

At the seedling stage (1~2 years old), 10~15 kg of organic fertilizer and 0.2~0.4 kg of special rubber fertilizer are applied to each rubber seedling every year. 6 times, 0.05 kg each time.

In the sapling period (3-7 years), 15-20 kg of organic fertilizer and 0.3-0.5 kg of rubber fertilizer are applied to each plant every year, and 3 to 5 times a year, 0.1 kg each time.

Each year, the cut gum tree applies 20-30 kg of organic fertilizer and 0.5-1.0 kg of special fertilizer for rubber. It is applied 2-3 times a year, 0.3-0.5 kg each time.

3. Fertilization time:

It should be based on the growth habits of the gum tree, the season and the nature of the fertilizer. Organic fertilizers are applied every year from September to December in the late rainy season; chemical fertilizers (nitrogen fertilizers, special fertilizers for rubber) should be applied in portions during the rainy season from April to September, each time when the rubber leaves are stable or begin to germinate; they are not applied before winter Apply nitrogen fertilizer.

4. Fertilization method:

Organic fertilizer can be mixed with phosphate fertilizer (calcium magnesium phosphate, superphosphate), combined with deep turning and hole expansion to improve the soil, using furrow application method, the specifications are: young tree depth 20~30 cm, width 30~40 cm, length 50 ~80 cm; tapping trees are 50 cm wide and 1 cm long. The fertilizer ditch should be flexibly controlled according to the amount of fertilizer, and the position should be rotated year by year. Due to the long-lasting effect of organic fertilizer, fertilization will damage the root system, so it is generally applied only once in winter and spring. The application of chemical fertilizers includes sprinkling, furrowing, water application or mixed application with oat fertilizer.

5. Fertilization parts:

In principle, it is to see the root and fertilize. You can refer to the range of the canopy vertical projection to the ground to absorb the densest roots. The distance of the fertilization site from the base of the gum tree is generally 20-30 cm for 1-2 years old; 60-80 cm for 3-4 years old; 100-150 cm for 5-6 years old, and 150-200 cm for tapping tree.