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Impact of High-Lignin Fermentation Byproduct on Soils with Contrasting Organic Carbon Content

^a USDA-ARS, North Central Soil Conservation Res. Lab., 803 Iowa Ave., Morris, MN 56267
^b USDA-ARS, Land Management and Conservation Res., Washington State Univ., Pullman, WA 99164-6421

View larger version (23K): [in this window] [in a new window]   Fig. 1. Minimum and maximum daily air temperatures for soil pots incubated at ambient conditions. Temperatures ranged from 13 to 39°C between days of the year (DOY) 140 and 262.

View larger version (12K): [in this window] [in a new window]   Fig. 2. Crude humic acid extracted after 118-d incubation of the two soils (Svea and Langhei) with high-lignin fermentation byproduct (HLFB).

View larger version (11K): [in this window] [in a new window]   Fig. 3. Percentage of water-stable aggregates measured on air-dried and remoistened soil as a function of crude humic acid concentration in the two soils amended with high-lignin fermentation byproduct (HLFB) and incubated for 118 d. Regression equation calculated based on observations from both soils.