Development of fish farming with use of ponds established on secondary saline territories
To restore the fertility of saline soil by chemical melioration, large means are needed, whereas establishment of fishery ponds by leveeing them by dams allows to return the fertility of the soil. In the paper, the authors state that technological scheme of aqua-crop-rotation for saline (3.5-3.6 g/l) soils may be applied for fish growing during first two years. After this, the soil salinity becomes 0.2-0.3 g/l and the soil may be used for crops growing. During following 2-3 years the mineralization increases, due to watering, up to 0.5-0.6 g/l. Refilling ponds by water and fish growing during one vegetation period allows to return the mineralization to initial level of 0.2-0.3 g/l. The general conclusion is that the regime of the pond-field aqua-crop-rotation by years depends on increase or decrease of soil salinity.