The influence of row position and selected soil attributes on Acarina and Collembola in no-till and conventional continuous corn on a clay loam soil

Population abundances of both Acarina (mites) and Collembola (springtails) were examined for continuous corn grown under no-till and conventional mana gement practices on a clay loam, an Orthic Humic Gleysol (Typic Haplaquoll) near Ottawa, Ont., Canada (Lat. 45 degrees 22' N; Long. 75 degrees 43' W). For each tillage practice, samples for soil faunal extraction and soil att ribute characterization were taken periodically during the growing seasons of 1989 (5 samplings) and 1990 (4 samplings). Each time, samples (0-5 cm de pth) were taken every 15 cm across a 1.5 m transect spanning three rows of corn that included both a traffic and a non-traffic row in order to assess if population abundances were significantly influenced by soil attributes r elated to changes in disturbance and compaction due to row position. Row po sition had a significant effect (analysis of variance based on split-split plot model) on Cryptostigmata in 1989, and in 1990, on Prostigmata, Onychiu ridae, and Cryptostigmata. From canonical correlation analysis, for 1989 an d 1990, respectively, 71% and 61% of the variation in the biotic data set c ould be explained by variation in the abiotic data. Crown copyright (C) 199 9 Published by Elsevier Science B.V. All rights reserved.