The problems of waterlogging and secondary salinity prevalent in most irrigated lands have resulted from the excessive use of water for irrigation (resulting from inefficient irrigation systems, poor distribution systems and poor on-farm management practices), from inadequate and inappropriate drainage management, and from the discharge of "spent" drainage water into good-quality water supplies which are used elsewhere for crop production.
(the excessive use of water for irrigation; resulting; from inefficient irrigation systems, poor distribution systems and poor on-farm management practices) (good-quality water supplies; are used; L:elsewhere; for crop production)
the excessive use of water for irrigation good-quality water supplies
resulting are used
from inefficient irrigation systems, poor distribution systems and poor on-farm management practices
L:elsewhere for crop production