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Particulate Organic Matter Composition and Pythium Damping-Off of Cucumber

^a Dep. of Horticulture, Oregon State Univ., 4017 ALS, Corvallis, OR 97456
^b School of Natural Resources and Dep. of Geological Sciences, The Ohio State Univ., 2021 Coffey Rd., Columbus, OH 43210
^c Dep. of Plant Pathology, The Ohio State Univ., 1680 Madison Ave., Wooster, OH 44691

View larger version (24K): [in a new window]   Fig. 1. Changes in total and size-fractionated POM concentrations during decomposition in sand. Fine fraction: 53–420 µm; midsized fraction: 420 µm–1 mm; and coarse fraction: 1–2 mm

View larger version (26K): [in a new window]   Fig. 2. Subtraction spectra (DR-FTIR) representing (a) 865–1825 cm-1 region: changes in sawdust-bedded cow manure compost composition during the composting process (A); changes in compost-derived POM composition during decomposition in sand (Day 83 minus Day 506) (B); (b) 3015–2805 cm-1 Aliphatics region: changes in sawdust-bedded cow manure compost composition during the composting process (A); changes in compost-derived POM composition as suppression is supported during decomposition in sand (Day 83 minus Day 391) (B); changes in compost-derived POM composition as suppression is lost during decomposition in sand (Day 391 minus Day 506) (C)

View larger version (37K): [in a new window]   Fig. 3. Average spectra (DR-FTIR: 865–1825 cm-1 region) representing compost composition at the beginning of composting (A); compost-derived POM composition at the beginning of decomposition in sand (Day 83) (B); compost-derived POM composition at the end of decomposition in sand (Day 506) (C)

View larger version (23K): [in a new window]   Fig. 4. Subtraction spectra (DR-FTIR: 865–1825 cm-1 region) representing changes in compost-derived POM composition as suppression is supported during decomposition in sand (Day 83 minus Day 391) (A); changes in compost-derived POM composition as suppression is lost during decomposition in sand (Day 391 minus Day 506) (B)

View larger version (23K): [in a new window]   Fig. 5. Subtraction spectra (DR-FTIR: 780–1825 cm-1 region) representing difference in composition of coarse and fine compost–derived POM (coarse minus fine spectra, Day 83) (A); difference in composition of midsized and fine compost–derived POM (midsized minus fine spectra, Day 83) (B)