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Corn (Zea mays L.) Root Distribution in Response to Variation in Soil Water Content  

Kim, Won-Il (National Institute of Agricultural Science and Technology)
Jung, Goo-Bok (National Institute of Agricultural Science and Technology)
Huck, M.G. (Department of Natural Resources and Environmental Sciences, University of Illinois)
Kim, Yong-Woong (Department of Agricultural Chemistry, Chonnam National University)
Park, Ro-Dong (Department of Agricultural Chemistry, Chonnam National University)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.35, no.1, 2002 , pp. 1-11 More about this Journal
Abstract
Root distribution was monitored in the root zone of corn fields on several soil series in central Illinois during three growing seasons in order to find the effect of soil series and tillage system on root growth. A minirhizotron technique was used to videotape each soil profile in weekly intervals to a depth of 75 cm under conventional tillage (CT) and no tillage (NT) systems of cultivation. Root distribution near soil surface generally increased during the early stages of the growing season, but declined as surface soil moisture was depleted in late summer. Even though root distribution was not significantly different between soil series in this experiment. differences in root distribution between soil series were associated with the increases in root-available water storage capacity. Root population in the top 30 cm of NT plots. where increased water infiltration rates and saturated flow of soil moisture into the subsoil, was generally higher than that of CT plots in Illinois corn fields. Foots appeared in the deeper layers later in the growing season, with root penetration into subsoil layers occurring as much as 2-3 weeks earlier on the NT plots than in CT plots. In conclusion, root distribution was significantly affected by the tillage systems, but not different by soil series.
Keywords
Tillage system; Minirhizotron; Root distribution; Corn; Soil series;
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