Lysimetric investigation for establishing the effect of high subsurface water on corn yield
2003
Banishka, N. (Institut po Melioratsii i Mekhanizatsiya, Sofia (Bulgaria))
In the period 2001-2002 lysimetric investigations were carried out for the purpose of establishing the effect of high subsurface waters on Knezha-509 hybrid corn yield. During the vegetation period, four models of soil wetting were realized in compensation lysimeters by subsurface water and by irrigation via additional water input, and the action of different regulated systems was simulated for the different variants. Additional variant was also investigated - the control outside lysimeters whereat no subsurface water was observed. Variant 1 was the most production during both years of investigation (1790 kg/da and 1580 kg/da), which was due to the utilization of subsurface water for wetting of the root-containing soil layer in the beginning of vegetation period and the additional water supply for subsurface wetting during the critical phases of corn development. Variant 4 gave the lowest yield 1160 kg/da, and variant 5 give 1140 kg/da, where irrigation was solely by rainfall and surface water.
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