SOIL ORGANIC MATTER AND CROP YIELDS AS INFLUENCED BY THE FREQUENCY OF SUMMERFALLOWING

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Abstract
Organic matter and nitrogen content of a Black lacustrine clay soil at Winnipeg was maintained at a high level by intensive cropping to cereal grains. Frequent fallowing resulted in the greatest decline in soil organic matter.Yields after fallow were greater than yields of second or third crop, but greatest production per hectare per year was obtained by continuous cropping. Barn manure applications reduced the rate of decline of soil organic matter and nitrogen, and increased crop yields. Application of monoammonium phosphate did not affect soil organic matter or nitrogen, but increased yields slightly.Barley produced the most grain, oats second and wheat the least when they were grown in continuous monoculture for 37 years.

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