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Interaction of Tillage and Soil Texture

Biologically Active Soil Organic Matter in Illinois

B.A. Needelmana, M.M. Wanderb, G.A. Bolleroc, C.W. Boastb, G.K. Simsd and D.G. Bullockc

a Dep. of Agronomy, 116 ASI Building, Pennsylvania State Univ., University Park, PA 16802 USA
b Dep. of Natural Resources and Environmental Sciences, Univ. of Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801 USA
c Dep. of Crop Sciences, Univ. of Illinois, 1102 S. Goodwin Ave., Urbana, IL 61801 USA
d USDA, 1102 S. Goodwin Ave., Urbana, IL USA



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  		Fig. 1 Soil organic C (SOC) as affected by (a) the interaction of tillage x depth, (b) the main effect of tillage, and the interaction of tillage x depth x sand content in the (c) surface (0–5 cm) and (d) subsurface (5–15 cm) depths. The lines in (c) and (d) represent the linear response of tillage x depth to sand content used as a covariate

 


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  		Fig. 2 Tillage effects on biologically active soil organic matter within soil depths (0–5, 5–15, and 15–30 cm) and in the overall sampling depth (0–30 cm): (a) and (b) particulate organic matter C, (c) and (d) potentially mineralizable N, and (e) and (f) microbial biomass C

 


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  		Fig. 3 Particulate organic matter (POM) C as affected by the interaction of tillage x depth x sand content in the (a) surface (0–5 cm) and (b) subsurface (5–15 cm) depths. The lines in (a) and (b) represent the linear response of tillage x depth to sand content used as a covariable

 




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The SCI Journals Agronomy Journal Crop Science
Journal of Natural Resources
and Life Sciences Education		 Vadose Zone Journal
Journal of Plant Registrations Journal of
Environmental Quality		 The Plant Genome
Copyright © 1999 by the Soil Science Society of America.