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. 1990 Jul;16(7):2277-89.
doi: 10.1007/BF01026937.

Allelochemicals in soil from no-tillage versus conventional-tillage wheat (Triticum aestivum) fields

K G Cast  1 , J K McPherson, A J Pollard, E G Krenzer Jr, G R Waller
Affiliations

Allelochemicals in soil from no-tillage versus conventional-tillage wheat (Triticum aestivum) fields

K G Cast et al. J Chem Ecol. 1990 Jul.

Abstract

Putative allelochemicals found in the soil of no-tillage and conventional-tillage wheat plots near Stillwater, Oklahoma, were obtained by a mild alkaline aqueous extraction procedure, bioassayed to determine their biological activity, purified, and analyzed with a capillary gas chromatography-mass spectrometry-data analysis system. The most significant inhibition was found in bioassays of extracts from soil collected immediately after harvest in June, July, and August. No-tillage soils produced significant inhibition during the rest of the year also. Mass spectrometry showed fatty acids as the most abundant compounds. However, when bioassayed authentic samples of the five free fatty acids showed no significant biological activity toward wheat.

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