Porous pots for irrigation
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CTA. 1987. Porous pots for irrigation. Spore 7. CTA, Wageningen, The Netherlands.
Permanent link to cite or share this item: http://hdl.handle.net/10568/44585
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Buried porous earthenware pots could have a big future as a viable irrigation method in arid and semi-arid areas, according to specialists in low cost irrigation in Latin America. Pots are being used in this way on farms in north-east Brazil. The...
Buried porous earthenware pots could have a big future as a viable irrigation method in arid and semi-arid areas, according to specialists in low cost irrigation in Latin America. Pots are being used in this way on farms in north-east Brazil. The porosity of the pots can be varied during manufacture, to take into account the permeability of the soil and the speed with which water seeps out of the pot to irrigate nearby plants. In the simplest systems, pots are used individually to water trees for reforestation or windbreaks by burying one pot close to each tree. For larger areas, methods of linking the pots into a single system have been developed. In north-east Brazil, large pots have been linked with PVC pipe, but researchers are now developing smaller pots, or capsules. These should give better control of the amount of water used. The capsules developed so far have been created in a mould and vary in size with an average diameter of 400 mm. Capsules have a narrow neck with an inlet and an outlet pipe so that they can be linked together by PVC tubing and plastic connectors glued into the apertures. Once the pipes are sealed into the capsules, water can flow along the system, topping up the capsules as it flows. Up to 2600 capsules have been used per hectare. Trials have shown water consumption can be kept down to 10 litres per capsule per day. Crops irrigated in this way have yielded well. In systems over small areas of up to 500 sq. metres, it has been established that the amount of water passing out of the last capsule is virtually the same as that leaving the first pot. Trials on larger areas are now being planned. For further information: World Water, July 1985 Thomas Telford Ltd. P O Box 124 Liverpool L69 2LQ United Kingdom
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