techniques of field examination and evaluation

... topsoil of 2.8 and 2.2% and total N contents of 0.15 and 0.10% (Lebbink et al., 1994) INT was practiced on fields with the initially high organic matter and total N contents (INTA) and on fields ... nature of roots and soil organic matter as sinks and sources of carbon and nutrients, others reflecting the effects of structure-following and structure-forming soil organisms on biochemical and ... recycling of crop residues and animal wastes Important objectives of these approaches are to match the supply of soil nutrients with the demands of the crops (synchronization and synlocation) and to...

Ngày tải lên: 11/08/2014, 15:20

... staff of the Department of Microbial Ecology and Department of Experimental Mycology of the Institute of Microbiology, Czechoslovak Academy of Sciences, who helped with the organization of the ... application of biological preparations may in the future partially replace the use of agrochemicals and thus contribute to environmental improvement and enhancement of the quality of soil, water and ... enzymes of a range of isolates of _T harzianum and viride using gel electrophoresis, isoelectric focussing, chromatofocussing and fast protein liquid chromatography (Ridout et al., 1986 and unpublished)...

Ngày tải lên: 29/06/2014, 09:20

... increased slightly and then decreased after 11 d All seedlings recovered 18 d after the onset of the experiment The patterns of g evolution at the constant temperature of 8.7°C and at a were throughout ... the first 11 d and then declined The shape of the curve is similar to that for transpiration Conclusions Initiation and development of current yr needles affected the results of gas exchange ... (1977) Effects of cold soil on water relations and spring growth of Douglas fir seedlings For Sci 30, 628-634 Lopushinsky Nambiar E.K.S., Bowen G.D & Sands R (1979) Root regeneration and plant water...

Ngày tải lên: 09/08/2014, 04:20

... thermodynamics and kinetics of the binding of guanidines and N-hydroxyguanidines to iNOS Removal of the a-amino or a-carboxylate moiety of l-Arg has important effects on the ability of the resulting ... Substrate specificity of iNOS as reference compounds and two pairs of non-a-amino acid compounds, BuGua ⁄ BuNOHG and TFBGua ⁄ TFBNOHG were also studied The determined values of konapp and koff app are ... 3.8- and 3.6-fold lower than those for their nonfluorinated analogues BuGua and BuNOHG, respectively, and the koff app values for TFBGua and TFBNOHG are 1.6 and times lower than those for BuGua and...

Ngày tải lên: 16/03/2014, 22:20

Ngày tải lên: 14/11/2014, 10:02

... impact of quite a small level of contamination on these results Reassessment of the effects of the mutations on coenzyme specicity In view of the dramatically altered gure for the stringency of coenzyme ... site-directed mutagenesis and X-ray crystallography Biochem J 385, 7583 Banta S, Swanson BA, Wu S, Jarnagin A & Anderson S (2002) Alteration of the specicity of the cofactorbinding pocket of Corynebacterium ... (40 mM) over a range of NAD P+ concentrations (0.011 mM) under standard assay conditions All experiments were repeated in triplicate and the kinetic parameters and their standard errors ( SE)...

Ngày tải lên: 06/03/2014, 00:20

... structure of a sentence can be concexved of as a network (which can be linearized, see Pl~tek, Sgall and Sgall, in press) the nodes and edges of which are labelled A label of a node consists of a ... in Automatic Understanding of Natural Language, Prague Bull of MathematiCal Linguistics 34, 5-19 Kasher A and De-M° Gabbay (1976), On the Semantics and Pragmatics of Specific and Non-Specific Indefinite ... features and grammAtemes of individual work forms occupy similar positions as their daughter nodes) Also the procedures for the application of inference rules and for the identification of (full and...

Ngày tải lên: 24/03/2014, 05:21

... (100) Si wafer Results and discussion The calibration of the sputtering apparatus as regards the incorporation of H was done using ERDA by means of the single layers of a-Si and a-Ge Figure 2a shows ... peaks at 1880 and at 2010 cm-1, which are the fingerprints of the monohydride bonds of H to Ge and Si, respectively [10,18-20] The shape of the Si-H peak indicates that the peak of the Si di-hydride ... release of H and the formation of the H bubbles Second, the creation of craters if the initial H content is very high and/ or the annealing conditions are very severe [7-9] As to the release of H,...

Ngày tải lên: 21/06/2014, 05:20

... pine stands and stands composed of a mixture of jack pine and white birch and jack pine and trembling aspen Source DF Mean square P>F Stand type Error 19 0.498 0.929 0.711 Figure Skewness of basal ... Stand structure and allometry of trees during self-thinning of pure stands, J Ecol 66 (1978) 599–614 Structure of mixed jack pine stands on clay [31] Nilsson U., Development of growth and stand ... mapping of the area [4] was used for site selection Three stand types were selected: (i) pure jack pine stands, (ii) mixture of jack pine and trembling aspen, and (iii) mixture of jack pine and paper...

Ngày tải lên: 08/08/2014, 01:21

... 19–7% of total C and 22–6% of soil N in loose LF and recovered 31–9% of C and 14–6% of N in occluded LF fractions In a study of arable soils, Wander and Bidart (2000) found that the proportion of ... Arshad, 1996b; Wander and Bidart, 2000) Gill and Burke (1999) used 13C natural abundance to assess the invasion by woody plants of grasslands (Texas and New Mexico) or by grasses of shrublands (Utah) ... of C and 1.5–3.5% of N in loose and 12–22.5% of C and 11–19.5% of N in occluded fractions This is consistent with findings that POM is lost rapidly when soils are subject to tillage (Tiessen and...

Ngày tải lên: 12/08/2014, 05:21

... (LF) and FDA hydrolytic activity were negatively related to severity of root rot of corn and bean and DO of cucumber (Darby, 2003) β-glucosidase and arylsulfatase activities and soil content of ... required to improve our understanding of the impact of organic matter quality and other soil and system properties on the populations and activities of both the pathogen and its specific antagonists ... 2,4-diacetylphloroglucinol have been implicated in suppression of take-all of wheat, Fusarium wilt of pea, cyst nematode and soft rot of potato, and Thielaviopsis root rot of tobacco (Weller et al., 2002) Antibiotic...

Ngày tải lên: 12/08/2014, 05:21

... is often used as an indicator of the microbial contribution to soil organic matter, plant health, and understanding nutrient fluxes (i.e., the transport and storage of nutrients) Estimates of ... extraction of HA and FA followed by acidic separation, (2) citrate extraction of glomalin, and (3) density separation of POM Quantities were measured by using gravimetric and carbon weights and comparing ... lignification of the cell wall, (3) synthesis of cellulose or callose, (4) phytoalexin accumulation, (5) release of hydrolytic enzymes, (6) synthesis of proteinase inhibitors, and (7) accumulation of hydroxyproline-rich...

Ngày tải lên: 12/08/2014, 05:21

... Sanderson, J.B., Ivany, J.A., and White, R.P 2002 Influence of rotation and tillage on forage maize productivity, weed species, and soil quality of a fine sandy loam in the cool-humid climate of ... Effects of soil texture and grassland management on soil organic C and N and rates of C and N mineralization Soil Biol Biochem 26:1221–1231 Haynes, R.J 1999 Labile organic matter fractions and aggregate ... Stratification of soil organic matter with conservation tillage depends on the inherent level of soil organic matter, intensity of disturbance, type of cropping system, and length of time In an analysis of...

Ngày tải lên: 12/08/2014, 05:21

... of short stubble, virtually all aboveground biomass is removed At a yield of 45 Mg ha–1 of 30% dry matter silage, the average nutrient removal amounts to 202 kg of N, 49 kg of P, and 205 kg of ... example, the type and quantity of bedding can significantly alter the C:N ratio and thus the balance between immobilization and mineralization Magdoff and van Es (2000) noted that dairy and beef manures ... consequences of overloading the soil with nutrients and off-site movement include leaching of nitrate into groundwater (Sommerfeldt et al., 1988) and the accumulation of P in the soil (Gartley and Sims,...

Ngày tải lên: 12/08/2014, 05:21

... additions and adequate nutrition for a healthy soil and large, diverse populations of microorganisms Tillage and burning of crop residues often negatively and dramatically affect the chemical and physical ... exudates of plants: III Effects of temperature and “cold shock” on the exudation of various compounds from seeds and seedlings of maize and cucumber Plant Soil 27:319–328 Wagner, G H., and D C ... diversity (El Nashaar and Stack, 1989) Take-all decline of wheat occurs after several years of monoculture and is correlated with the appearance of several different types of organisms and alterations...

Ngày tải lên: 12/08/2014, 05:21

... yields of corn and oat seedlings (Lee and Bartlett, 1976; Albuzio et al., 1994); numbers and lengths of tobacco roots (Mylonas and McCants, 1980); dry weights of shoots, roots, and nodules of soybean, ... in the presence of protozoa than in the presence of bacteria alone Hand and Hayes (1988) provided 18 individual species of bacteria and 22 different species of fungi to E fetida and showed that ... different types of calcareous soil (sandy loam, clay loam, and silty clay loam) Casts of both the anecic and endogeic earthworms had densities of bacteria and actinomycetes one to three orders of magnitude...

Ngày tải lên: 12/08/2014, 05:21

... for the presence of daily urinary output above l and for the use of mannitol and hypertonic saline solutions, and created timedependent continuous variates for glucose levels and hyperglycemia ... levels and in the rate of hyperglycemia according to DDAVP use or the presence of hypernatremia (data not shown) Relation between hypernatremia and ICU mortality Patients who died on days and of ... of hypernatremia and the use of DDAVP (data not shown) Page of (page number not for citation purposes) Critical Care Vol 13 No Maggiore et al Table Disorder of water balance over the course of...

Ngày tải lên: 13/08/2014, 16:21

... indicators Land quality indicators and their use in sustainable agriculture and rural development Land resources evaluation and the role of land-related indicators THE FRAMEWORK FOR LAND EVALUATION Land ... vegetation, climate and other aspects of land in order to identify and make a comparison of promising kinds of land use in terms applicable to the objectives of the evaluation Land evaluation should ... or multiple) Land evaluation is the process of assessment of land performance when used for specific purposes, involving the execution and interpretation of surveys and studies of land forms, soils,...

Ngày tải lên: 06/07/2014, 08:20

... Chi-squares are of type lihood X respectively of: 46.37 and 2.38, df of 2, probabilities respectively less then 0.001 and of 0.305; Fig 2) In Filain and Mersuay, after the effect of season of baiting ... 6.66, df of 2, probabilities respectively of 0.089 and 0.036; in Mersuay, likelihood X respectively of 6.66 and 10.13, df of 2, probabilities respectively of 0.036 and 0.006) In Mersuay and Filain, ... status of trees, rated as healthy or moderately declining and the length of mother roots per volume of soil (t value of 0.77 and probability of 0.447), the number of fine roots per length of mother...

Ngày tải lên: 08/08/2014, 01:21

... emissions (i.e., extraction and combustion of fossil fuels) and land use changes (e.g cutting and burning large areas of forest) Module • Soil pH and Organic Matter Formation of Organic Chelates Humus ... defined as the summation of plant and animal residues at various stages of decomposition, cells and tissues of soil organisms, and well-decomposed substances (Brady and Weil, 1999) Though living ... soils as a result of over-grazing grasslands and the conversion of grasslands to tilled farmland This reduction has lead to decreased soil fertility, increased fertilization needs, and increased...

Ngày tải lên: 05/03/2014, 21:20