Complete NPK Fertigation Schedule for Grapes — Nashik Maharashtra

Nashik district accounts for over 80% of India's table grape exports. Getting the fertigation schedule right is the difference between A-grade export quality and local market rejection. This guide covers the complete stage-wise program from dormancy through harvest.

📍 Applies to: Thompson Seedless, Flame Seedless, Sonaka, 2A Clone, Sharad Seedless on black cotton soil pH 7.8–8.5, drip irrigated, Nashik / Sangli / Solapur region.

Bahar treatment — soil prep
Bud break to 4-leaf stage
Berry set and sizing
Colour development (veraison)
Pre-harvest and harvest
Micronutrient calendar
Common mistakes

Stage 1 — Bahar Treatment and Soil Preparation

Timing: October–November (for Rabi/winter crop)

Gypsum 100–150 kg/acre — improves calcium availability, reduces soil pH slightly
Iron EDDHA 6% — 1.5–2 kg/acre soil application before pruning
Zinc Sulphate 33% — 8–10 kg/acre as basal
MOP 60% — 20 kg/acre basal for potassium loading
FYM/compost — 2 tonnes/acre to improve soil structure and organic matter

⚠ Do NOT apply urea or nitrogen at bahar preparation — this forces vegetative growth and delays bud differentiation.

Stage 2 — Bud Break to 4-Leaf (November–December)

This is the most critical nitrogen window. Vines are building shoot framework — adequate N here determines canopy density for the season.

Week	Product	Rate (kg/acre)	Notes
Week 1 (bud break)	NPK 19:19:19	3	Balanced start
Week 2	Calcium Nitrate	3	Ca builds cell walls
Week 3	NPK 19:19:19	3	Continue vegetative push
Week 4 (4-leaf)	Urea 46%	5	N for shoot elongation

Foliar at 2-leaf stage: Zinc EDTA 12% at 0.5 g/L + Iron DTPA 11% at 2 g/L. This prevents early season micronutrient deficiency before root uptake is fully active.

Stage 3 — Berry Set and Sizing (January–February)

Shift from N-dominant to Ca+K dominant. Calcium builds berry cell walls — critical for preventing cracking and improving shelf life for export.

Week	Product	Rate	Purpose
Berry set	MAP 12:61:00	2 kg/acre	Phosphorus for cell division
Berry set	Calcium Nitrate	3 kg/acre	Ca — most critical stage
Sizing W1	NPK 19:19:19	4 kg/acre	Balanced nutrition
Sizing W2	Calcium Nitrate	3 kg/acre	Continue Ca loading
Sizing W3	NPK 13:00:45	3 kg/acre	Shift to K dominance
Sizing W4	Calcium Nitrate	2 kg/acre	Final Ca push

Stage 4 — Colour Development / Veraison (March)

Potassium drives sugar translocation, colour development and berry weight gain. Reduce N to zero.

NPK 13:00:45 — 5 kg/acre/week for 3 weeks
SOP 00:00:50 — 2 kg/acre/week alternating with 13:00:45
Potassium Silicate — 2 mL/L foliar × 2 sprays (strengthens berry skin, reduces cracking)

✅ Stop all nitrogen from veraison onwards. Late N delays colour, reduces sugar Brix, and causes poor post-harvest quality.

Stage 5 — Pre-Harvest (2–3 weeks before cutting)

SOP 00:00:50 — 3 kg/acre — final K push for Brix and weight
Calcium Chloride 77% — 2 g/L foliar × 2 sprays — firms up berries, reduces shattering during transport
Stop all irrigation 5–7 days before harvest if weather cooperates — concentrates sugars

Micronutrient Calendar

Product	Rate	Timing	Method
Iron EDDHA 6%	2 kg/acre	Pre-bahar (Oct)	Soil
Iron DTPA 11%	2 g/L	Every 15 days bud break–sizing	Foliar
Zinc EDTA 12%	0.5 g/L	Monthly throughout	Foliar
Boron 20%	1 g/L	Berry set × 3 sprays	Foliar
Magnesium Sulphate	5 g/L	Every 3 weeks	Foliar
Calcium EDTA	2 g/L	Weekly during sizing	Foliar

5 Common Mistakes in Grape Fertigation

Over-applying nitrogen at sizing — causes excessive vegetative growth, berry cracking, delays colour
Skipping calcium — the #1 cause of cracking and export rejection
Using MOP instead of SOP at sizing/harvest — chloride in MOP affects flavour and post-harvest life
Ignoring iron EDDHA at bahar — iron chlorosis wipes out shoot growth and yield in next stage
Applying boron late — boron must be applied at berry set for effect, not after cracking starts

Complete NPK Fertigation Schedule for Grapes — Nashik Maharashtra

Contents

Stage 1 — Bahar Treatment and Soil Preparation

Stage 2 — Bud Break to 4-Leaf (November–December)

Stage 3 — Berry Set and Sizing (January–February)

Stage 4 — Colour Development / Veraison (March)

Stage 5 — Pre-Harvest (2–3 weeks before cutting)

Micronutrient Calendar

5 Common Mistakes in Grape Fertigation

Related Products

Get Expert Advice