Agricultural Sciences

Alley Farming (The Tropical Agriculturalist) by B.T. Kang, A.N. Atta-Krah, L. Reynolds

By B.T. Kang, A.N. Atta-Krah, L. Reynolds

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Pan evaporation figures, lysimeter data. 5. soil profiles; crops, crop rotation, cultivation periods; size of plots; soil moisture characteristics; effective root depths; depth to water-table, especially during growing season. Dew In hydrology and in irrigation practices it is customary to treat dew in the same way as precipitation and to consider it as a positive term in the water balance. In reality the phenomenon is much more complex. Dew must be well distinguished from interception of water droplets from fog, which indeed should be classified as precipitation.

2/13. Wind velocities at the windward and leeward sides of reeds windbreaks of different density Source: see Fig. 2/3. a very short distance up to some 2-3 h is the dense belt more effective. The effect of belts of deciduous trees varies according to the season. When deciding on a belt, the relevant season should be taken into consideration. A second belt gives less protection than the first most windward one. Openings in a belt give rise to higher wind speeds. This can be the case in old porous belts with heavy trees and a lack of undergrowth.

Under calm conditions, the exchange of moisture between the plants and air at a height of several metres is negligible and distillation of moisture from the soil takes place. In case of light wind, exchange processes in the air are developed to a certain degree. However, they are insufficient to prevent the surface temperature from dropping below the air temperature. If the air is so moist that a drop of only a few degrees is enough to reach the dew point, dew is formed and vertical vapour transport from the air to the surface is possible.

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