. Sour sawdust and bark : its origin, properties, and effect on plants. Wood waste as mulch, soil conditioner, etc. Figure 2.—Closeup of sour sawdust in center of pile shown in figure 1. Note black appearance of sample 1 in jar; contrast with light color of "normal" sawdust from surface of pile shown in upper left. Dark area in "/?on?2o/" pile shows exposed, wet sawdust below All samples were screened through a 10-mesh sieve and placed in screwcapped 1-gallon jars. Titratable acidity, pH, and lime requirement determinations were made on the samples as received. Fo
. Sour sawdust and bark : its origin, properties, and effect on plants. Wood waste as mulch, soil conditioner, etc. Figure 2.—Closeup of sour sawdust in center of pile shown in figure 1. Note black appearance of sample 1 in jar; contrast with light color of "normal" sawdust from surface of pile shown in upper left. Dark area in "/?on?2o/" pile shows exposed, wet sawdust below All samples were screened through a 10-mesh sieve and placed in screwcapped 1-gallon jars. Titratable acidity, pH, and lime requirement determinations were made on the samples as received. For ash, carbon, and nitrogen analyses, subsamples were air-dried and hammermilled to pass a 60-mesh sieve. All samples were weighed on an ovendrv basis, and results are so expressed. Data were obtained by the following procedures: Water content—by drying at 105° C. for 24 hours. Ash—burning in a muffle furnace at 700° C. Nitrogen—Kjeldahl method. Carbon—dry combustion at 1,400° C. (Allison, Bollen, and Moodie 1965). pH—on 1:10 mechanically stirred water suspensions of 10-mesh— material after 2/ 1 hour preliminary stirring, using the glass electrode with a Beckman— automatic The results are shown in table 1. In addition to the foregoing properties, total acidity was determined by titration with NaOH of 10-gram samples in 100 milliliter water while stirring 1 hour on the Beckman automatic titrator. The first titration was made after the 1:10 suspensions stood 24 hours with occasional stirring. The titration was extended to 48 hours and to 7 days. Results are given on a cumulative basis and expressed as pounds of limestone (CaCOo) required to neutralize 1 ton (dry basis) of sawdust (table 2). The end point of pH was chosen because this is the value at which carbonates are converted to bicar- bonates, also, it is near the neutralization point of phenolphthalein which is commonly used as an indicator for titration of weak acids with strong bases. Acidity o
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