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Effects of Rainfall Events on Soil in Orchard Field under Herbicide Treatment. 1. Temporal Characteristics in Soil Physical and Chemical Properties  

Chung, Doug-Young (Department of Bioenvironmental Chemistry College of Agriculture and Life Science Chungnam National Univ.)
Kim, Pil-Joo (Division of Applied Life Science (BK21), Graduate School, Gyeongsang National University)
Park, Mi-Suk (Department of Bioenvironmental Chemistry College of Agriculture and Life Science Chungnam National Univ.)
Publication Information
Korean Journal of Soil Science and Fertilizer / v.43, no.1, 2010 , pp. 25-35 More about this Journal
Abstract
The periodic application effects of two different herbicides on soil physical properties were observed in a slightly hilly orchard of pear tree located on the southestern flank of the Palbong Mountain in Gongju Chungnam : (1) bare surface vegetation; (2) glyphosate-treated plot; (3) paraquat-treated plot. The slope of experimental plots ranged from 5.5%to 10.2%at an altitude of 125 mand 896 $m^2$ ($28m{\times}32m$) in area. The total respective rainfall events were 47, 52, 52 times during experimental period from 2006 to 2008, while approximately 65 percent of daily rainfall intensity from2006 to 2008 was less than 20 mm a day. The organic matter contents on the surface 15 cm soil ranging from1.23%to 1.84%in 2006 were changed into from1.35 %to 2.28%in 2008 in the order of control > glyphosate > paraquat > bare plot in 2008, indicating that the herbicide treatment influenced the accumulation organic matter in soil. The changes in soil particle contents showed that the loss of soil particles in top 5 cm soil depth was greater in a bare soil than in other treatments such as control, glyphosate, and paraquat-treated plot. The net changes in the bulk densities showed that there were little variations between May of 2006 and Nov. of 2008 even though there were some losses of the soil particles. The soil strength of the glyphosate-treated bare plots was much greater than those of other plots such as control, glyphosate, and paraquat plots. However the soil strengths in control plots were lower than those in the plots of glyphosate and paraquat treated ones.
Keywords
Rainfall; Soil Properties; Soil strength; Orchard; Herbicides;
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