Soil Polysaccharides and Aggregation in Crop Sequences

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Abstract
Soil polysaccharides and aggregation (mean weight‐diameter and aggregate stability) were determined in the corn plots from a rotation project where the preceding crops were corn, oats, alfalfa‐brome, or winter wheat. The residues from these crops did not result in significant differences in the content of soil polysaccharides; only in a two‐year crop sequence, corn and oats underseeded with red clover, were the polysaccharides increased by the addition of manure. Aggregate stability was greater in the rotations that included a grass‐legume; manure improved aggregation over unmanured plots. In a multiple regression analysis, polysaccharides and organic matter together, accounted for 36% of the variation in mean weight‐diameter and 27% of the variation in aggregate stability.The seasonal variation in the content of polysaccharides and aggregate stability showed a marked out‐of‐phase relationship except under oats, which were underseeded with a grass or legume.

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