Fertigation schedule

Fertigation schedule for Thompson Seedless grafted on Dogridge

Growth Stage	Expected duration (days after pruning)	Month of operation	Nutrient application (kg/ha)
Growth Stage	Expected duration (days after pruning)	Month of operation	N	P₂O₅	K₂O

Foundation pruning
Shoot growth	1-30	April-May	60	-	-
Shoot growth	31-40	April-May	20	35.5	-
Fruit bud differentiation	41-60	May-June	-	71	-
Cane maturity and Fruit bud development*	61-120	June-August	-	-	80
121 days - fruit pruning*	121 -	August- Fruit pruning	-	-	-
Fruit pruning
Shoot growth	1-40	October- November	80	-	-
Bloom to Shatter	41-55	November- December	-	26.5	-
Berry growth and development	56-70	December - January	-	26.5	-
Berry growth and development	71-105	December - January	80	-	80
Ripening to Harvest	106- harvest	January - March	-	-	80
Rest period	Harvest to Foundation pruning (20 days)	March-April	26	18	26
Total			266	177.5	266

The schedule has been worked based on experiment carried out in heavy and calcareous soils using saline irrigation water (EC ranging from 1.7-1.8 dS/m)

This experiment was conducted in a row to row and vine to vine spacing of 10¢×6¢. Fertigation schedule can be suitably applied up to a row to row and vine to vine spacing of 8¢×5¢.

The nutrient quantity given are guidelines for distributing the NPK doses at different growth stages and may change based on the site and climatic conditions.

One kg P=2.29 kg P₂O₅ and one kg K=1.21 kg K₂O

Under normal climatic conditions generally, it takes 10-12 days for sprouting.

The nutrient applications should necessarily take into account soil, petiole and water testing report.

Contribution of nutrients from other sources like composts, FYM, green manuring irrigation water, etc. should also be taken into consideration for adjusting the nutrient dose. All the manures and fertilizers, irrigation water and other inputs should be tested for presence of heavy metals (As, Cd, Co, Cr, Cu, Hg, Mn, Ni, Pb, Sn, and Tl) before use.

By: Dr. J. Sharma and Dr. A.K. Upadhyay