U.S. Department of Agriculture: Agricultural Research Service, Lincoln, Nebraska
Date of this Version
February 1969
Abstract
Studies of stubble-mulched soils from three locations in Nebraska showed larger total counts (bacteria and actinomycetes) and fungi than in plowed soils. Penicilliurn urticae Bainier numbers increased in subtilled soil compared with either plowed soil or subtilled soil with crop residues removed.** P. urticae B. produces patulin, a phytotoxic substance. This organism is regarded as one of the possible sources of the toxicity problem arising in stubble mulching. Penicillium expansum Link and patulin were studied in the apple replant problem.
The purpose of this paper is to present methods to estimate P. urticae B. numbers in soils and demonstrate patulin in selected fungal isolates.
Comments
Published in Plant and Soil XXX, no. 1 February 1969.