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Soil Aggregation—Organic Matter Relationships in Redtop‐Potato Rotations
Author(s) -
Salomon M.
Publication year - 1962
Publication title -
soil science society of america journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.836
H-Index - 168
eISSN - 1435-0661
pISSN - 0361-5995
DOI - 10.2136/sssaj1962.03615995002600010014x
Subject(s) - loam , silt , chemistry , organic matter , total organic carbon , carbon fibers , soil organic matter , fraction (chemistry) , soil structure , humin , pyrophosphate , soil water , environmental chemistry , soil science , chromatography , organic chemistry , geology , materials science , paleontology , composite number , composite material , enzyme
Beneficial effects of redtop residues on yields of potatoes grown on a Bridgehampton silt loam were correlated with increased soil aggregation; particularly with larger aggregates. There was an accumulation of carbon in all aggregates studied. However, the quantity does not appear to be related consistently to degree of aggregation. Analyses of total soil and aggregates (> 1 mm., 1 to 0.25 mm., 0.25 to 1 mm.) for microbial gums, polyuronides and acid hydrolyzable polyhexose carbohydrates indicate a similarity in quantities of these constituents as functions of organic carbon. Generally, somewhat wider C/N ratios (13:1) were found in larger aggregates where redtop was included, compared with smaller sizes (11:1). Extraction of organic matter with 0.5 N NaOH and neutral 0.1 M pyrophosphate indicates similar humic materials loosely held by this silt soil regardless of source. About 6 to 9% of the total carbon found in aggregates could be consistently accounted for as acid‐hydrolyzable carbohydrate. There was little difference in this fraction due to rotation or size of aggregate.