HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS		QUICK SEARCH:   [advanced] Author: Keyword(s): Year:  Vol:  Page:

This Article Full Text (PDF) Alert me when this article is cited Alert me if a correction is posted Services Similar articles in this journal Alert me to new issues of the journal Download to citation manager Citing Articles Citing Articles via Google Scholar Google Scholar Articles by Andraski, B. J. Articles by Lowery, B. Search for Related Content PubMed Articles by Andraski, B. J. Articles by Lowery, B. Agricola Articles by Andraski, B. J. Articles by Lowery, B.

Erosion Effects on Soil Water Storage, Plant Water Uptake, and Corn Growth

U.S. Geological Survey, 333 W. Nye Lane, Carson City, NV 89706

B. Lowery^*

Dep. of Soil Science, 1525 Observatory Dr., Univ. of Wisconsin, Madison, WI 53706

* Corresponding author.

ABSTRACT

Many investigators have suggested that the greatest negative effect of erosion on soil productivity is the decrease in available water-holding capacity, but few have attempted to evaluate this relation directly. In this 4-yr study, we evaluated the effects of past erosion on soil water storage, plant water uptake, and corn (Zea mays L.) growth on a linear slope of Dubuque silt loam soil (fine-silty, mixed, mesic Typic Hapludalf) in southwestern Wisconsin. Levels of past erosion were based on depth to red clay (2Bt horizon): slight, 0.95 m; moderate, 0.74 m; and severe, 0.45 m. The total quantity of plant-extractable water that could be stored in the upper 1 m of slightly eroded soil (181 mm) was 7% more than that for moderately eroded soil (169 mm) and 14% more than that for severely eroded soil (159 mm). For all erosion levels, water retained in the 0.5- to 1.0-m soil depth was utilized by corn. Erosion level had no negative effect on early-season plant growth. As plant-extractable water decreased to <55 to 60% of total, evapotranspiration (ET) and vegetative-growth rates decreased as erosion level increased. The greatest differences in ET rates among erosion levels were observed during a 35-d period in the drought year of 1988 when rates averaged 3.7 mm d^–1 for slight erosion, 2.6 mm d^–1 for moderate erosion, and 2.2 mm d^–1 for severe erosion. For the 3 yr in which plant water stress was observed, maximum plant heights for the slight erosion level averaged 7% more than those for moderate erosion and 13% more than those for severe erosion. Although the soil's capacity to store and supply water decreased as erosion increased, the observed effects of erosion level on grain and stover yields, grain-yield components, and harvest populations typically were not significant.

Research supported by the College of Agricultural and Life Sciences, Univ. of Wisconsin-Madison.

Received for publication September 30, 1991.