Irrigation schedule based upon pan evaporation for various growth stages of Thompson Seedless vines raised on Dogridge rootstock using saline irrigation water**

Growth Stage

Expected duration (days after pruning)

Water requirement (litres/day/hectare per mm of evaporation)

Month of operation

Expected monthly Pan evaporation (mm) in different grape growing regions

Approximate water (litres /hectare/ day)

Foundation pruning

Shoot growth

1-30

4200

April-May

8-12

33,600-50,400

 

Shoot growth

31-40

4200

April-May

8-12

33,600-50,400

 

Fruit bud differentiation

41-60

1400

May-June

8-10

11,200-14,000

 

Cane maturity and Fruit bud development*

61-120

1400

June-August

0-6

0-8,400

 

121 days - fruit pruning*

121 -

1400

August- Fruit pruning

0-6

0-8,400

 

Fruit pruning

 

Shoot growth

1-40

4200

October- November

6-8

25,200-33,600

 

Bloom to Shatter

41-55

1400

November- December

4-6

5,600-8,400

 

Berry growth and development

56-70

4200

December - January

3-6

12,600-25,200

 

Berry growth and development

71-105

4200

December - January

3-6

12,600-25,200

 

Ripening to Harvest

106- harvest

4200

January - March

8-10

33,600-42,000

 

Rest period

Harvest to Foundation pruning (20 days)

-

March-April

8-10

-

 

 

*     The above growth stages generally coincide with rainy season and no irrigation may be required in heavy soils.

**   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).

Note:

 

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

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