Abstract
Installation of pipelines causes soil disturbance with possible crop yield loss. Fertilizer and manure treatments may compensate for crop losses. Corn productivity was evaluated on five sites disturbed by pipeline installation in order to assess the relative sensitivity of soil types to the effects of pipeline construction during autumn and winter, and to determine the benefits of fertilizer and manure treatments. Trench, spoil bank, working side (ON-ROW) and undisturbed zones (OFF-ROW) as well as fertilizer and manure treatments were compared on three soils (Morrisburg loam, North Gower clay, Ste. Sophie loamy sand). Autumn and winter installation were compared on Morrisburg and North Gower soils. On the Ste. Sophie site only winter installation was studied. Pipeline installation did not affect corn emergence. On Morrisburg soil sites, autumn installation delayed silking, reduced plant heights and corn yields ON-ROW as compared to undisturbed soil; winter installation affected corn productivity only on the trench zone. On North Gower soil sites, pipeline installation had little effect on corn performance. At the Ste. Sophie site, installation resulted in delayed silking, and reduced plant height and yield in 1977 but improved corn yields in 1978. Fertilizer and manure treatments increased corn yields and accelerated silking at all sites. ON-ROW yields were not restored to OFF-ROW at the Morrisburg soil sites responsive to fertilizer treatments. Corn yield reductions were greater at sites with lower initial organic matter contents and higher initial bulk densities. Key words: Corn (Zea mays L.), fertilizers, manure, soil series, organic matter, bulk density
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