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USING WEATHER DATA FOR IRRIGATION SCHEDULING
- Institution
- University Of The Freestate (UFS)
determining when and how much to irrigate using weather information and the response of the weather
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Appendix to Theme 10: Crop Coefficient TablesTable 10.1 Single (time-averaged) crop coefficients, Kc, and mean maximum plant
heights for non stressed, well-managed crops in subhumid climates (RH min
≈ 45%, u2 ≈ 2 m/s) for use with the FAO Penman-Monteith ETo (Allen et al.,
1998)
Maximum Crop
Crop Kc mid Kc end
Height (h) (m)
a. Small Vegetables 0.7 1.05 0.95
Broccoli 1.05 0.95 0.3
Brussel Sprouts 1.05 0.95 0.4
Cabbage 1.05 0.95 0.4
Carrots 1.05 0.95 0.3
Cauliflower 1.05 0.95 0.4
Celery 1.05 1.00 0.6
Garlic 1.00 0.70 0.3
Lettuce 1.00 0.95 0.3
Onions
- dry 1.05 0.75 0.4
- green 1.00 1.00 0.3
- seed 1.05 0.80 0.5
Spinach 1.00 0.95 0.3
Radish 0.90 0.85 0.3
b. Vegetables - Solanum Family (Solanaceae) 0.6 1.15 0.80
Egg Plant 1.05 0.90 0.8
Sweet Peppers (bell) 1.05 2
0.90 0.7
Tomato 1.15 2
0.70- 0.6
0.90
c. Vegetables - Cucumber Family 0.5 1.00 0.80
(Cucurbitaceae)
Cantaloupe 0.5 0.85 0.60 0.3
Cucumber
- Fresh Market 0.6 1.002 0.75 0.3
- Machine harvest 0.5 1.00 0.90 0.3
Pumpkin, Winter Squash 1.00 0.80 0.4
Squash, Zucchini 0.95 0.75 0.3
Sweet Melons 1.05 0.75 0.4
Watermelon 0.4 1.00 0.75 0.4
d. Roots and Tubers 0.5 1.10 0.95
Beets, table 1.05 0.95 0.4
247
, Cassava
- year 1 0.3 0.803 0.30 1.0
- year 2 0.3 1.10 0.50 1.5
Parsnip 0.5 1.05 0.95 0.4
Potato 1.15 0.754
0.6
Sweet Potato 1.15 0.65 0.4
Turnip (and Rutabaga) 1.10 0.95 0.6
Sugar Beet 0.35 1.20 0.705
0.5
e. Legumes (Leguminosae) 0.4 1.15 0.55
Beans, green 0.5 1.052 0.90 0.4
Beans, dry and Pulses 0.4 1.152
0.35 0.4
Chick pea 1.00 0.35 0.4
Fababean (broad bean)
- Fresh 0.5 1.152 1.10 0.8
- Dry/Seed 0.5 1.152
0.30 0.8
Garbanzo 0.4 1.15 0.35 0.8
Green Gram and Cowpeas 1.05 0.60- 0.4
0.356
Groundnut (Peanut) 1.15 0.60 0.4
Lentil 1.10 0.30 0.5
Peas
- Fresh 0.5 1.152 1.10 0.5
- Dry/Seed 1.15 0.30 0.5
Soybeans 1.15 0.50 0.5-1.0
f. Perennial Vegetables (with winter dormancy 0.5 1.00 0.80
and initially bare or mulched soil)
Artichokes 0.5 1.00 0.95 0.7
Asparagus 0.5 0.957
0.30 0.2-0.8
Mint 0.60 1.15 1.10 0.6-0.8
Strawberries 0.40 0.85 0.75 0.2
g. Fibre Crops 0.35
Cotton 1.15- 0.70- 1.2-1.5
1.20 0.50
Flax 1.10 0.25 1.2
Sisal 8
0.4-0.7 0.4-0.7 1.5
h. Oil Crops 0.35 1.15 0.35
Castor bean (Ricinus) 1.15 0.55 0.3
Rapeseed, Canola 1.0- 0.35 0.6
1.159
Safflower 1.0- 0.25 0.8
1.159
Sesame 1.10 0.25 1.0
Sunflower 1.0- 0.35 2.0
248
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