Lyzimeter experiments were conducted at Sakha Agric. Res. Station
during the summer season (2000) and winter season (200012001) to study
the effect of the continuous or alternating low quality water (sewage, well and
drainage water) with fresh water under surface and sub- surface lirrigation at
25 and SOcm depths on soybean and sugarbeet yield and their components.
plant elemental contents, soil salinity and SOIl elemenml contents. The data
reveal that the alternative irrigation by low quality water with fresh water
achieved the highest yield and yield components for soybean and sugarbeet
while the continuous irrigation with low quality water led to significant
decrease in the yields of both crops. Also, surface irrigation su assed sub-
surface irrigation in increasing total biomas for both crops. It could be
observed from the results that fresh water gave the highest yield ollowed by
sewage water and drainage water, while well water alone or mixed with
sewage water gave the lowest values of yield. The irrigation with sewage and
drainage water as well as well water directly or belended with sewage water
led to an accumulation of elements in plant tissues but they stil' within the
acceptable ranges. On the other hand, the soil salinity contents after
harvesting of each crop were clearly increased under all treatments
compared to those obtained before planting. On the contrast, SAR values in
soil solution after harvesting were lower than the values recorded before
planting. The soil contents of available macro, micronutrients and heavy
metals were increased by using low quality water for irrigation.