How to Fertilize During the Fruit Development Stage? | Technical Guidelines for Citrus Trees (Part 4)

Stage 1:
Mix 0.25 kg of 30-10-10 + 0.5 liters of Fulvitop + 0.5 kg of Magnisal into 200 liters of water. This helps the fruit grow bigger, smoother, and shinier. Spray continuously 3–4 times, spacing each application 10 days apart.
It is recommended to combine with SÓI CA, 3 PHÚT, and Herbal Pesticide to control thrips, fruit flies, and mites.

Stage 2:
Mix 0.25 kg of 19-19-19 + 0.25 liters of Fulvic Liquid (or Amino Liquid) + 1 pack of BM chelated micronutrients into 200 liters of water. This helps enhance skin firmness, reduce peel thickness, and improve shine. Spray continuously 3–4 times, spacing each application 10 days apart.
It is recommended to combine with SÓI CA, 3 PHÚT, Sạch Nhện, and Siêu Nhện to control thrips, fruit flies, and mites.

Stage 3:
Mix 0.25 kg of Poly Feed 16-8-34 + 0.25 liters of BM Super K + 0.5 kg of Magnisal into 200 liters of water. This helps fruits enlarge, have thinner peels, better shine, sweeter taste, and higher weight. Spray 2–3 times, spacing each application 10 days apart.
It is recommended to combine with SÓI CA, 3 PHÚT, Herbal Pesticide, and Siêu Nhện to control thrips, fruit flies, and mites.

Soil fertilization:
(Use balanced NPK ratios appropriate to the tree’s age and fruit load)

Basal root irrigation:
Mix 1 liter of Amino Chelate Zn + 2 kg of 30-10-10 in 200 liters of water. Apply 5–7 liters per tree before flowering.

After flowering:
Broadcast 0.5 kg of 15-10-20 + 1–4 kg of organic fertilizer per tree. Apply twice, 15 days apart. On the second application, add 200 grams of Haifa Cal (Calcium Nitrate).

Supplementary root irrigation:
Mix 1 kg of 999 rooting stimulant + 2 kg of BM ROOT’S 2 for 50 trees.

15 days after the second soil application:
Broadcast 0.5 kg of 16-16-16 + 1 kg of organic fertilizer per tree. Apply twice, 15 days apart.

Further supplementary root irrigation:
Mix 1 liter of Amino Chelate Zn + 1 liter of BM Root for 40 trees.

15 days after the fourth soil application:
Broadcast 0.5 kg of 15-10-20 + 200 grams of Root Tablets per tree. Apply continuously 2–3 times.

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Wishing all farmers great success in cultivation.