SOIL ORGANIC MATTER IN SUSTAINABLE AGRICULTURE - CHAPTER 6 pot

... (1980). FIGURE 6. 6 Carbon in glomalin (glomalin-C, mg C glomalin/g soil) or particulate organic matter (POM) (POM-C, mg C POM/g soil) extracted from soil (1 g) with 50 mM citrate or by using density ... LLC 182 Soil Organic Matter in Sustainable Agriculture other fungi) or microbial competitors]; or (5) growing crops with multiple-gene pathogen resistance or limiting t...

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... of soil organic matter on sorption equilibria. Environ. Sci. Technol. 33, 165 7– 166 3. Johnston, A.E. (1991). Fertility and soil organic matter. In W.S. Wilson (Ed.), Advances in Soil Organic Matter Research: ... (2001). Biologically active soil organic matter fractions in sustainable cropping systems. Appl. Soil Ecol. 16, 63 – 76. Woods, L.E. (1989). Activ...

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... Syst. 68 :253– 268 . With permission.) organic conventional low-input Depth (cm) 0-1 5 1 5-3 0 3 0 -6 0 no winter cover crop 6 0-9 0 9 0-1 20 winter cover crop 12 0-1 50 15 0-2 00 05020 30 NO 3 -N + NH 4 -N (mg ... Modeling soil organic matter in organic- amended and nitrogen fertilized long-term plots. Soil Sci. Soc. Am. J. 56: 4 76 488. Pia, J. F. 1998. CIESA...

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... LLC 172 Soil Organic Matter in Sustainable Agriculture McKellar, M.E., and E.B. Nelson. 2003. Compost-induced suppression of Pythium damping-off is mediated by fatty-acid-metabolizing seed-colonizing ... LLC 166 Soil Organic Matter in Sustainable Agriculture Chun, D., and J.L. Lockwood. 1985. Reductions of Pythium ultimum, Thielaviopsis basicola, and Macro- phomina ph...

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... drilling and ploughing of some Australian soils. Aust. J. Soil Res. 18:27– 36. 1294_C08.fm Page 264 Friday, April 23, 2004 2:25 PM © 2004 by CRC Press LLC 2 36 Soil Organic Matter in Sustainable Agriculture TABLE ... CRC Press LLC 260 Soil Organic Matter in Sustainable Agriculture al., 19 96) . In wheat–fallow, no tillage can keep the surface soil moister duri...

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... in © 2004 by CRC Press LLC 2 96 Soil Organic Matter in Sustainable Agriculture Soil Quality Soil quality is defined as the capacity of a soil to function within ecosystem boundaries to sustain ... a cementing agent for holding soil particles together. SOM can be maintained or increased by incorporating crop residues, crop rotation, cover crops, permanent plantings, main...

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... nutrient cycling processes in many ecosystems. By ingesting and turning over large amounts of soil and organic matter, they increase the rates of mineralization of organic matter, converting organic ... organic- waste-degrading earthworms can increase rapidly, fragmenting organic wastes and increasing microbial activity in them dramatically. The main difference between com- p...

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... (%) 0 10 20 30 40 50 60 70 80 90 100 -4 ,6 -4 ,5 -4 ,4 -4 ,3 -4 ,2 -4 ,1 -4 -3 ,9 -3 ,8 -3 ,7 V P multiratio in SOM Relative mineralized P (%) © 2003 by CRC Press LLC testing, with methods developed for mineral soils, may lead ... air-dried soils (range: 375–1 960 ) in pristine or cultivated Quebec organic soils (Parent et al., 1992), and 766 mg P kg –1...

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... CONCLUSION In drained organic soils, the moorsh-forming process is characterized by repeated shrinkage and swelling, as well as loss of organic substances in upper soil layers. Indicators of change in ... 0.03 0 .68 ± 0.07 0.14 ± 0.07 0. 36 ± 0. 16 nHv 7 ± 1.5 0.19 ± 0.20 0.03 ± 0. 06 0. 86 0.14 ± 0.11 0.70 ± 0.13 0. 16 ± 0.07 0. 46 ± 0.14 nHa nHt Not occurring in fibric pe...

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... organic soils showing 30 60 % SOM and rich in clay and silt; they also recommended a target pH of 4.0 for organic soils showing 30 60 % SOM and rich in sand, as well as for organic soils containing ... —— Moorsh Materials (n = 48, s e = 0.041) Field-moist (FM) 6. 20 6. 20 6. 26 < 0.01 < 0.01 Air-dry (AD) 6. 13 6. 11 6. 11 < 0.01 NS Oven-dry (OD) 6. 08 6. 08 6. 11...

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