SOIL ECOLOGY IN SUSTAINABLE AGRICULTURAL SYSTEMS - CHAPTER 7 (end) pptx

... many of the great gains in production made in the green revo- lution by use of high-yielding varieties with high inputs of inorganic fertilizer cannot be maintained indefinitely. Among the causes ... Maintaining nutrient status of soils: macronutrients, in Soil Resilience and Sustainable Land Use, Greenland, D. J. and Szabolcs, I., Eds., CAB International, Wallingford, pp. 171 –198....

Ngày tải lên: 11/08/2014, 15:20

... methylene-blue staining (second bar at each depth) in INTA and CONVB in 1990. CONVB = conventional farming system since 1985 on low-organic matter soil; INTA = integrated farming system since 1985 ... various agricultural management practices. Agric. Eco- systems Environ., 51:21–42. Brussaard, L., 1994. The ecology of soil organisms in reduced input farming, in Soil Biota M...

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... can find more protective niches in fine-textured soils than in coarse-textured soils, leading to a higher grazing pressure in the coarse-textured soils (Postma, 1989) and a stronger increase in ... Relative Increase in C Mineralization after Drying, Fine-Sieving, and Rewetting of Soil Samples in Comparison with Drying/Rewetting Only (%) in Sandy, Loamy, and Clay Grassland So...

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... 0.18 0 .75 * 0.24 0.09 0. 17 0.53 % Total 0.011 0.040 0.005 0.010 Bacterivore Biomass 0. 87 1.25 0 .70 0 .77 1.29 0.60 % Total 0.054 0.0 67 0.0 47 0. 075 Omn-Pred. Biomass 0.06 0. 07 0.86 0. 07 0.06 1. 17 % ... assessment of root -soil- microbial-faunal interactions, in Ecological Interactions in Soil, Fitter, A. H., Atkinson, D., Read, D. J., and Usher, M. B., Eds., Blackwell,...

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... Noordwijk, 19 87; Nye and Tinker, 1 977 ). The models can be used for extrapolating to other soil and climate (rainfall) conditions. Major uncertainties remain in the biological interactions in the rhizosphere. ... reduce © 19 97 by CRC Press LLC remaining roots increased while dry weight decreased. A slight net immobi- lization of minerals of N and P during autumn appeared in CONV b...

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... Reduction of damping- off diseases in soil from indigenous Mexican agroecosystems, in Agroecology, Researching the Ecological Basis for Sustainable Agriculture, Gliessman, S. R., Ed., Springer-Verlag, ... myc- orrhiza in agro-ecosystems. I. Influence of nitrogen fertilization and green manure in continuous monoculture and in crop rotation on the inoculum potential of winter whea...

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... that in traditional systems a more rapid decline in casting occurs in the first few years, while it declines more steadily in alley cropping. As casting activity was higher in the alley cropping ... Sustain Tropical Forest Resources, OTA-TM-F-31, OTA US Congress, Washington, DC. Parera, V., 1989. The role of L. leucocephala in farming systems in Nusa Tenggara Timur, Indonesi...

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... the daughterproductsproducedbythenitriers.AtthispointitisnotclearifAMOis kineticallydominantinfull-scaleWWTPsamongallenzymesthatmightbecapable of transforming pharmaceuticals, especially if the enzymes are present in fast-grow - in gheterotrophicorganisms.Proofthatnitriersareresponsiblefortransformation ofsteroidsinfull-scalesystemshasnotbeenshowndenitively.Itmaybethatnitri - ...

Ngày tải lên: 18/06/2014, 16:20

... for ordering instructions.) Building and maintaining soil quality is the basis for successful organic farming. Periodic soil testing will help determine soil quality. USDA NRCS 7 P AGE R E Philosophies ... Quality Soil Building and maintaining soil quality is the basis for successful organic farming. However, before developing a soil management plan focused on soil qua...

Ngày tải lên: 20/04/2014, 17:43

... Introduction 1 67 7.1.1 Tylosin 168 7. 1.2 Enteric Bacteria 169 7. 2 Mater ials and Metho ds 170 7. 2.1 Preliminary Trial 170 7. 2.2 Main Study 171 7. 3 Results a nd Discussion 171 7. 3.1 P reli mi ... M.L., Ingerslev, F., Halling-Sorensen, B., and Tjornelund, J. 2000. Stability of tylosin Ainmanurecontainingtestsystemsdeterminedbyhighperformanceliquidchroma- to graphy. Chemosphere 4 0...

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