. Sour sawdust and bark : its origin, properties, and effect on plants. Wood waste as mulch, soil conditioner, etc. 1 5 8 10 12 15 20 25 28 ?AYS Figure 3.—Carbon dioxide evolution from fresh Douglas-fir sawdust (50 grams, ouendry basis, incubated at 28° C. with 107-percent moisture (38 percent of water-holding capacity)). Results and Discussion Seed germination under both weathered and fresh sawdust (samples 5 and 6, page 2) was comparable for radish, sunflower, and corn, but the plants became more or less yellow, indicating nitrogen deficiency. A light application of ammonium nitrate in solut
. Sour sawdust and bark : its origin, properties, and effect on plants. Wood waste as mulch, soil conditioner, etc. 1 5 8 10 12 15 20 25 28 ?AYS Figure 3.—Carbon dioxide evolution from fresh Douglas-fir sawdust (50 grams, ouendry basis, incubated at 28° C. with 107-percent moisture (38 percent of water-holding capacity)). Results and Discussion Seed germination under both weathered and fresh sawdust (samples 5 and 6, page 2) was comparable for radish, sunflower, and corn, but the plants became more or less yellow, indicating nitrogen deficiency. A light application of ammonium nitrate in solution after 28 days alleviated these symptoms. Onion seed germination under these sawdusts was much less than in the unmulched soil, but the seedling development was normal. The most striking results were with the sour sawdust (sample 1). No radish and few sunflower seeds germinated; the sunflower seedlings soon 3rellowed, died, and appeared bleached. Corn and onion seeds germinated well, but again, the seedlings soon died. The dark brown sawdust (sample 4), only slightly less acid than the sour sawdust, gave similar results, although sunflower germination was better (figs. 4 and 5). The sour sawdust mulch killed and bleached the transplanted tomato, pepper, and cabbage plants within 7 days. Pepper plants grew normally under the other sawdusts. Cabbage was normal under fresh sawdust but under weathered and dark brown sawdust died within 28 days. Tomato plants under fresh, weathered, and dark brown sawdust (samples 6, 5, and 4) survived but showed nitrogen deficiency. These results illustrate the deadly potency of sour sawdust and confirm similar results experienced in a number of home gardens. Attempts to render the sawdust safe 8. Please note that these images are extracted from scanned page images that may have been digitally enhanced for readability - coloration and appearance of these illustrations may not perfectly resemble the original Bollen, W. B. (Walter Beno),
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Keywords: ., bookcentury1900, bookcollectionameri, bookcollectionbiodiversity
