| Banana |
15-30 |
Annual |
Early growth stage |
Requires excellent drainage for the entire root zone. Since the roots are deep, the soil must be drained to a far greater depth. |
| Bean |
30-50 |
60-90 |
Flowering and pod development |
Vegetative period is not sensitive when followed by ample water supply. |
| Cabbage |
30 |
70-90 |
Head formation and enlargement |
|
| Cacao |
45-200 |
Perennial |
|
Waterlogged areas and areas with prolonged drought are not good. Cacao is ruined by flooding for several weeks, but it is adversely affected by stagnant water, thus drainage is necessary for heavy soils. |
| Cassava |
100-150 |
Annual |
|
It can withstand periods of prolonged drought except at planting. |
| Cauliflower |
|
|
No critical moisture sensitive stage; frequent irrigation required from planting to harvest |
|
| Citrus |
90-120 |
Perennial |
During flushes of new growth, fruits setting, and rapid increase of fruit size |
Sticky and poorly drained soils should be avoided. No stagnant water should stand in the grove as this will enhance disease development particularly in the trunk and root system. |
| Corn |
60 |
90-120 |
Silking and ear development |
Last irrigation of corn has to be done in the middle of the reproductive stage (kernel formation) since yield tends to become low when not irrigated up to the productive stage growth. Corn has to be irrigated, at least, once every 2 weeks (DS) up to the reproductive stage of growth. It should not be allowed under the waterlogged condition at any time for more than 2 days. |
| Cotton |
70-130 |
150-180 |
Flowering period |
Over supply of water retards fruiting and branch development, and delays maturity. It should not be allowed under waterlogged conditions at any stage of growth for more than 4 days. |
| Cowpea |
35-50 |
110-120 |
|
A weekly irrigation of 35 mm throughout the growing season of the crop will ensure crops of good quality. |
| Cucumber |
30 |
60-70 |
|
It is relatively tolerant to high moisture especially when the soil is easily drained. During dry-season planting, a weekly irrigation of 35-40 mm would be best for the crop. |
| Eggplant |
50 |
90-120 |
|
During dry season planting, a weekly irrigation of 35-40 mm would be best for the crop. |
| Garlic |
36-40 |
90-120 |
|
This requires moderately wet soil. |
| Grapes |
50-120 |
180-270 |
Shoot elongation and flowering, fruit filling |
| Lettuce |
30 |
40-50 |
Just before harvest when the ground cover is complete |
| Mungo |
40 |
90-100 |
Germination and at flowering stage and pod-filling stage |
|
| Onion |
35-55 |
90-100 |
During the period of root and bulb formation |
|
| Papaya |
120 |
|
|
Constant availability of soil moisture is associated with continuous growth which results in the regular production of flowers and fruits. Root system is sensitive to standing water; 2 days immersion is fatal. |
| Peanut |
58 |
140-160 |
Peak of flowering to early fruiting |
|
| Peas |
35-50 |
65-100 fresh, 85-120 dry |
Start of flowering and when pods are swelling |
|
| Pechay |
30 |
40-60 |
|
|
| Pili |
|
|
|
Sufficient water should be available during the dry months to irrigate the plants. During the succeeding years, either a small amount or no irrigation is necessary. |
| Potato |
50-70 |
100-150 |
Period of stolonization and tuber initiation |
Drought even for short period can have serious effect on yield and quality of crop, especially when it is accompanied with high temperature or it occurs during the last 9 weeks of growth. Inadequate or irregular water supply not only results in poor yield. |
| Radish |
30 |
40-60 |
Period of rooting and bulb formation |
An evenly distributed rainfall is required. |
| Soybean |
45-70 |
100-120 |
Germination and pod development |
It can withstand short drought without injury; can tolerate waterlogged conditions at any stage of growth of not more than 8 days. |
| Squash |
45-70 |
100-130 |
|
|
| Sugarcane |
150-250 |
270-365 |
Vegetative period, particularly during period of tillering and stem elongation |
Dry condition at maturation stage is extremely helpful in the accumulation of sugar in the plant; therefore, no irrigation is needed when the crop reaches the flowering stage. |
| Sweet Potato |
46 |
60-120 |
After formation of tubers |
An annual rainfall of 30-50 cm is considered to be best with low humidity, as the crop reaches maturity. It can tolerate considerable periods of drought but yields are very much reduced if a water shortage occurs 50-60 days after planting when root initiation has begun. |
| Sweet Pepper |
58 |
90-120 |
Throughout the growth period but particularly just prior and at start of flowering |
|
| Taro |
250 |
|
|
It is primarily adapted to moist environments, but can be grown under a wide range of conditions, from paddy culture to dry upland conditions under irrigation. It is necessary to provide sufficient water for vegetative growth or leaf development when grown in dry upland areas where rainfall is less than 175 cm. The use of furrow and sprinkler irrigation has proved satisfactorily. |
| Tobacco |
40-60 |
40-60 |
Period of rapid growth; knee high to blossoming |
It is relatively drought-tolerant but sensitive to flooding. |
| Yam |
115 |
|
Requires adequate moisture throughout growing period |
It is greatly considered drought-resistant. For optimum yield, adequate moisture between the 14th and 20th weeks of growth is of great importance. The major areas of production are centered where there is a sharply demarcated dry season of 2-5 months and a rainfall of 115 cm or more during the growing season. |
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