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Abstract.

Separate field studies using sprinkler and subsurface drip irrigation for corn production were conducted at Colby, Kansas from 2014 to 2016 examining five different irrigation capacities ranging from 25 mm/4 days to 25 mm/12 days. The irrigation treatments were scheduled only according to need with calculated ET-based water budgets but were limited to specific capacities. The conventional and drought tolerant hybrids performed differently with the drought tolerant hybrid generally establishing greater kernels/ear when conditions were drier and the conventional hybrid tended to compensate under wetter conditions with greater kernel mass (i.e., grain filling.) There appeared to be greater stability in grain yield for the subsurface drip irrigation system due to differences in yield component formation between the two irrigation systems.