Wolaita Sodo University; Department of Horticulture

Irrigation and Drainage CROPWAT Project Work for 1st Year Students

General Instructions:

Each group will have their own crop type and its characteristics. Please read each parameter carefully that are described below the following tables.

Each group will have common values/data about soil and climate.

Each group will be calculate ETo, Crop Water Requirement and Irrigation Schedule

Make sure that you have your own folder on the desktop represented by groups crop name.

Cheating or talking across other groups rather than within your team members will be disqualified your result.

Maximum given time to show the result will be 1:40 min.

Table 5 Approximate duration of growth stages for various crops in days (FAO, 1984)

Total

Initial stage

Crop Development stage

Mid season stage

Late season stage

Bean/green

75

15

25

25

10

90

20

30

30

10

Cabbage

120

20

25

60

15

140

25

30

65

20

Carrot

100

20

30

30

20

150

25

35

70

20

Cucumber

105

20

30

40

15

130

25

35

50

20

Eggplant

130

30

40

40

20

140

30

40

45

25

Lettuce

75

20

30

15

10

140

35

50

45

10

Maize, sweet

80

20

25

25

10

110

20

30

50

10

Melon

120

25

35

40

20

160

30

45

65

20

Onion/green

70

25

30

10

5

95

25

40

20

10

Onion/dry

150

15

25

70

40

210

20

35

110

45

100

20

30

35

15

Pepper

120

25

35

40

20

210

30

40

110

30

Potato

105

25

30

30

20

145

30

35

50

30

Radish

35

5

10

15

5

40

10

10

15

5

Soybean

135

20

30

60

25

150

20

30

70

30

Table 6 Rooting depth of mature irrigated crops grown in a deep permeable well- drained soil (FAO, 1984).

Shallow rooted 0-0.6m

Moderately deep rooted 0.5-1.2m

Deep rooted 1.0-2.0m

Broccoli (0.3-0.6)

Bananas (0.5-0.9)

Alfalfa (1.0-2.0)

Brussels sprouts (0.3-0.6

Barley (1.0-1.5)

Almonds (>1.5)

Cabbage (0.4-0.5)

Beans (0.5-0.7)

Asparagus (>1.5)

Cauliflower (0.3-0.6)

Beets, table (0.6-1.0)

Barley, winter (1.0-1.5)

Celery (0.3-0.5)

Cantaloupes (0.9-1.5)

Castor beans (>1.5)

Lettuce (0.3-0.5)

Carrots (0.5-0.1)

Cotton (1.0-1.7)

Onions (0.3-0.5)

Citrus (1.2-1.5)

Dates (1.5-2.5)

Pineapple (0.3-0.6)

Clover (0.6-0.9)

Flax (1.0-1.5)

Potatoes (0.4-0.6)

Cucumber (0.7-1.2)

Fruit trees (1.0-2.0)

Raddish (0.3-0.6)

Eggplant (0.7-1.2)

Grains, winter (1.5-2.0)

Spinach (0.3-0.5)

Grain, small (0.9-1.5)

Grapes (1.0-2.0)

Strawberries (0.2-0.3)

Grass, pasture (0.5-1.5)

Maize (1.0-1.7)

Groundnuts (0.5-1.0)

Olives (1.2-1.7)

Palm trees (0.7-1.1)

Pumpkins (>1.5)

Peas (0.6-1.0)

Sorghum(1.0-2.0)

Peppers (0.5-1.0)

Squash, winter (>1.5)

Soybeans (0.6-1.3)

Sugarcane (1.2-2.0)

Squash (0.5-1.0)

Sunflower(0.8-1.5)

Sugar beets (0.7-1.2)

Sweet potato, Yams (1.0-1.5)

Tobacco (0.5-1.0)

Tomatoes (0.7-1.5)

Turnips (0.7-1.1)

Walnuts (>1.5)

Watermelons (1.0-1.5)

Wheat (1.0-1.5)

Table 7 Allowable root zone water depletion between irrigations for near maximum yield (FAO, 1984)

Allowable available water depletion %

Root zone depth normally irrigated in deep soils (cm)

Beans, dry

50-70

60-90

Deciduous fruit

50-70

120-180

Potatoes

25-50

60-90

Sugar beet

30-60

90-120

Soybean

50-60

60-90

Vegetable crops

25-50

60-120

Data taken from stegman, musick and stewart (1980)

Table 9 Crop coefficients (Kc) (FAO, 1986)

Crop

Crop Development stages

Initial

Crop development

Midseason

Late season

At harvest

Total growing period

Banana

Tropical

0.4-0.5

0.7-0.85

1.0-1.1

0.9-1.0

0.75-0.85

0.7-08

Subtropical

0.5.-0.65

0.8-0.9

1.0-1.2

1.0-1.15

1.0-1.15

0.85-0.95

Bean

Green

0.3-0.4

0.65-0.75

0.95-1.05

0.9-0.95

0.85-0.95

0.85-0.9

Dry

0.3-0.4

0.7-0.8

1.05-1.2

0.65-0.75

0.25-03

0.7-0.8

Cabbage

0.4-0.5

0.7-0.8

0.95-1.1

0.9-1.0

0.8-0.95

0.7-0.8

Grape

0.35-0.55

0.6-0.8

0.7-0.9

0.6-0.8

0.55-0.7

0.55-0.75

Maize Sweet

0.3-0.5

0.7-0.9

1.05-1.2

1.0-1.15

0.95-1.1

0.8-0.95

Grain

0.3-05

0.7-0.85

1.05-1.2

0.8-0.95

0.55-0.6

0.75-0.9

Onion

Dry

0.4-0.6

0.7-0.8

0.95-1.1

0.85-0.9

0.75-0.85

0.8-0.9

Green

0.4-0.6

0.6-0.75

0.95-1.05

0.95-1.05

0.95-1.05

0.65-0.8

Pea, fresh

0.4-0.5

0.7-0.85

1.05-1.2

1.0-1.15

0.95-1.1

0.8-0.95

Pepper, fresh

0.3-0.4

0.6-0.75

0.95-1.1

0.85-1.0

0.8-0.9

0.7-0.8

Potato

0.4-0.5

0.7-0.8

1.05-1.2

0.85-0.95

0.7-0.75

0.75-0.9

Soybean

0.3-0.4

0.7-0.8

1.0-1.15

0.7-0.8

0.4-0.5

0.75-0.9

Sugar beet

0.4-0.5

0.75-0.85

1.05-1.2

0.9-1.0

0.6-0.7

0.8-0.9

Tobacco

0.3-0.4

0.7-0.8

1.0-1.2

0.9-1.0

0.75-0.85

0.85-0.95

Tomato

0.4-0.5

0.7-0.8

1.05-1.25

0.8-0.95

0.6-0.65

0.75-0.9

Watermelon

0.4-0.5

0.7-0.8

0.95-1.05

0.8-0.9

0.65-0.75

0.75-0.85

Citrus

Clean weeding

0.65-0.75

No weed control

0.85-0.9

Olive

0.4-0.6