SOIL ECOLOGY IN SUSTAINABLE AGRICULTURAL SYSTEMS - CHAPTER 6 pptx

... role in low-input agricultural systems. Their casting activity involves up to 11 .6% of the organic carbon and 12.9% of the total nitrogen of the 0 to 15 cm topsoil in undisturbed or recovering systems. Earthworms ... 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...

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 ... Cataloging -in- Publication Data Soil ecology in sustainable agricultural systems / edited by Lijbert Brussaard and Ronald Ferrera-Cerrato. p. cm. Proceedings of a symposium hel...

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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...

Ngày tải lên: 11/08/2014, 15:20

... their feeding on bacteria (Coleman et al., 1984). In fungal-dominated soils, fungal-feeding fauna such as many non-plant-parasitic stylet-bearing nematodes (Parmelee and Alston, 19 86) and various ... pp. 355– 366 . Coleman, D. C., 1985. Through a ped darkly: an ecological assessment of root -soil- microbial-faunal interactions, in Ecological Interactions in Soil, Fitter, A. H., Atkin...

Ngày tải lên: 11/08/2014, 15:20

... 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 but not in INT. During the next growing season ... in interpreting the results of such studies, however, as the immediate root environment, including root -soil contact, has been mod- ified. A comparison with decay along minirhizotron tubes...

Ngày tải lên: 11/08/2014, 15:20

... 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, ... produced in multiple-crop systems in many parts of the world, including 90% of beans in Colombia, 80% of beans in Brazil, and 60 % of maize in all the Latin American tro...

Ngày tải lên: 11/08/2014, 15:20

... 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 ... available is insufficient to satisfy the needs for pro- duction. Significant input of N to replace that removed in harvest may be achieved in farming systems incorporating N-fixing spec...

Ngày tải lên: 11/08/2014, 15:20

... 153 skeletonwithacarboxylicacidatposition3,ketogroupatposition4,andabasic N-moiety at position 7. 36 38 Gu and Karthikeyan 39 examined the binding of cipro- oxacin (CIP) (pK a1 =6. 16, pK a2 =8 .62 )toAl-andFe-hydrousoxides.CIPisan important third-generation uoroquinolone ... Sassman,S.A.,Sarmah,A.K.,andLee,L.S.,SorptionoftylosinA,tylosinDandtylo- sin A-aldol in soils, Environ. Toxicol....

Ngày tải lên: 18/06/2014, 16:20

... Quality Soil Building and maintaining soil quality is the basis for successful organic farming. However, before developing a soil management plan focused on soil quality in organic systems, ... (See page 8 for ordering instructions.) Building and maintaining soil quality is the basis for successful organic farming. Periodic soil testing will help determine soil quali...

Ngày tải lên: 20/04/2014, 17:43

... t t d d 1 ,miin ,min ,min - t tt tt t d dd dd d ¥ § ¦ ´ ¶ µ     2 (6. 8) In this case, equation 6. 4 becomes: Effective settling time   t tt t s dd d - ,min 2 (6. 9) Combiningequation6.9withequation6.3leadsto: V L t tt t s s dd d      min ,min 2 (6. 10) Equation ... Granulation in Sequencing Batch Reactors Yu Liu and Zhi-Wu Wang CONTENTS 6. 1 Introduction...

Ngày tải lên: 18/06/2014, 16:20