Agricultural University Grape Gradient Formula Fertilizer

Base fertilizer

Timing: Apply immediately after harvest; if not applied promptly, it may also be applied during the grapevine’s dormant period.
Function: Enhances tree vigor, promotes the growth of winter buds and flower bud differentiation after autumn, effectively reduces the number of male shoots in the following year, and ensures fruit set and fruit quality in the second year; supplementation with secondary and micronutrients can effectively mitigate premature decline in tree vigor and the occurrence of uneven fruit size in the second year.
Method: Deep tillage with trench application
Fertilizer recommendations: ① For high-yield orchards, apply 3,000–4,000 kg of well‑decomposed organic fertilizer, 100 kg of phosphate fertilizer, and 30 kg of balanced compound fertilizer; ② For low‑yield orchards, apply 2,000–3,000 kg of well‑decomposed organic fertilizer, 80 kg of phosphate fertilizer, and 20 kg of compound fertilizer; ③ For boron‑deficient orchards, add 0.5–1.0 kg of borax per mu; in saline‑alkali soils, be sure to supplement with iron fertilizer, and calcium, magnesium, and zinc can also be applied simultaneously.
Precautions: ① Organic fertilizers must be fully composted; ② The trench depth should be appropriate—too shallow or too deep will both hinder root absorption; ③ Avoid concentrating the fertilizer application in one spot; and strictly limit the amount of roots removed to no more than one-third of the total root mass.

Bud-promoting fertilizer

Timing: In regions where vines are winter‑buried, bud‑promoting fertilizer can be applied immediately after the vines are uncovered and trained onto the trellis; in areas without winter burial, it should be applied 10–15 days before spring bud break.
Function: Rapidly replenishes nutrients and promotes uniform bud break.
Method: shallow trench application or foliar spray
Fertilizer selection: 10 kg of high-nitrogen compound fertilizer or water-soluble fertilizer, plus a 300-fold dilution of Haijingling bio-stimulant for root application.
Precautions: ① In areas prone to late spring frosts, apply bud‑promoting fertilizer carefully to prevent frost damage; ② For grape varieties with vigorous growth or low fruit‑set rates, bud‑promoting fertilizer may be omitted.

Pre-flowering fertilizer

Period: 10–15 days before flowering
Function: For individual weak trees, to enhance tree vigor, or in orchards where water and fertilizer are applied in a staggered manner.
Method: Foliar application at the root zone
Fertilizer recommendations: ① To strengthen tree vigor, apply 3–5 kg per mu of Phosphorus-Potassium Source Depot, combined with a 300-fold dilution of Haijingling Root‑Applied Bio‑Stimulant; ② For water‑fertilizer management during flowering, use urea together with a 300‑fold dilution of Haijingling Root‑Applied Bio‑Stimulant.
Precautions: For water‑fertilizer topdressing, a certain level of practical experience is required, and the application of nitrogen fertilizer prior to flowering carries inherent risks.

Fruit-expanding fertilizer

Timing: Apply during the young fruit enlargement stage—when the fruits are about the size of mung beans, and at the latest when they reach the size of soybeans.
Function: Provides essential nutrients to support berry enlargement, shoot and leaf growth, promotes rapid grape berry expansion, strengthens tree vigor, and reduces physiological disorders caused by weak tree health in the later stages.
Method: shallow trench application or foliar spray
Fertilizer selection: Use a high-nitrogen compound fertilizer at 40–60 kg, combined with a root-applied solution of Haijingling bio-stimulant diluted 300 times, and apply calcium fertilizer 1–2 times.