Double-walled pots boost tree establishment in arid regions
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CTA. 1990. Double-walled pots boost tree establishment in arid regions. Spore 25. CTA, Wageningen, The Netherlands.
Permanent link to this item: http://hdl.handle.net/10568/45212
A new device consisting of a double-walled earthen pot called a ''jaltripti'' has been developed to help the establishment of trees in arid regions, where there are extremes of temperature, scanty and erratic rainfall and sandy soils which are low...
A new device consisting of a double-walled earthen pot called a ''jaltripti'' has been developed to help the establishment of trees in arid regions, where there are extremes of temperature, scanty and erratic rainfall and sandy soils which are low in moisture content and have poor water storage characteristics. The jaltripti is inexpensive (being made on a potter's wheel from locally-available materials). It is simple to use, and does not require energy. At the same time it uses every drop of water to the maximum. Small-scale and medium farmers in arid and semi-arid regions could benefit from this inexpensive technique. The jaltripti works on two simple principles: soil moisture tension and plant roots together create a suction force which draw moisture towards them from the neighbouring high moisture zones; and earthen pots have many micropores in their walls, which do not allow water to flow freely but allow its seepage in the direction where suction occurs. The base and the bottom of the inner pot are kept open, and the external side of the outer pot is rendered impervious. The pots are about 30cm high. The pot is placed in a pit so that its brim is level with the soil surface, and the area around it is filled in with soil; a sapling is then transplanted into the inner pot, and the space between the two walls of the pot filled with water and covered with a polythene sheet to prevent evaporation. Comparative growth of six-month-old ber saplings planted in a jaltripti and an open pit showed that those in jaltripti pots had a height of 60cm compared with 40cm for those in pits, they had a collar diameter of 0.66cm (against 0.37), a root length of 86cm (against 25cm) and' a fresh weight of 17.9g against 1.5g for those in open pits. For more details, contact: I.C. Gupta, P.M. Singh ND. Yadava and B.D. Sharma Central Arid Zone Research Institute Regional Station Bikaner 334002 INDIA