equipment for examining soils in the field
SOIL ECOLOGY IN SUSTAINABLE AGRICULTURAL SYSTEMS - CHAPTER 1 ppsx
... intense in CONVB than in INTA, due to the lower porosity of the soil in CONVB than in INTA Hypothesis #2b — Root production is higher, and therefore root-derived carbon inputs are higher in INTA ... sampling also being significant (Marinissen, 1994) Whereas in spring 1988, aggregate stability in the size class 4.8 to mm in INTA and CONVA was similar, it remained high in INTA, but decreased in ... 1994) Together with the lower macroporosity of the topsoil in CONVB, these observations indicate that the soil was more susceptible to compaction in CONVB than in INTA One of the causes of the higher...
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INTERRELATIONSHIPS BETWEEN MICROORGANISMS AND PLANTS IN SOIL doc
... inhibition was linked to binding of the bacteria to the hyphae, thus indicating that a lectin-type interaction is probably involved (Nelson et al., 1986) This interaction may not however be the ... action in the agroecosystom all these lines of research are intimately associated with the problems of soil fertility and crop yields These in turn have a direct hearing on the nutrition of mankind, ... maintenance of the population), the rhizosphere biomass can be calculated Further by counting the number of cells associated with the root using a washing technique and by determining the mean cell...
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Báo cáo lâm nghiệp: "Effects of soil temperature on gas exchange and morphological structure of shoot and root in 1 yr old Scots pine (Pinus sylvestris L.) seedlings" pot
... rate remained at the same level for 11 d and then declined The transpiration rate in seedlings at changing soil temperature increased slightly and then decreased after 11 d All seedlings recovered ... measurements The decline in A after 11 d in all treatments may be due to new needles (see Teskey et aL, 1984), which were included in the measurements The photosynthetic capacity of the developing current ... photosynthesis recovered up to the level of other treatments Photosynthetic efficiency decreased to 50-60% of the initial values in all treatments The largest decrease occurred in seedlings at...
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Báo cáo khoa học: Relationship between the structure of guanidines and N-hydroxyguanidines, their binding to inducible nitric oxide synthase (iNOS) and their iNOS-catalysed oxidation to NO pptx
... 0.4 binding of an N-hydroxyguanidine moiety in the iNOS heme pocket thus roughly involves the same binding energy as binding of the guanidine moiety, and the equilibrium constants are mainly ... of iNOS necessary for guanidines and N-hydroxyguanidines to efficiently bind to iNOS Criteria for the formation of NO from the oxidation of a guanidine by iNOS Contrary to what is observed for the ... (Table 2) As in the case of the N-hydroxyguanidines, the kcat values of NO formation from the oxidation of guanidines not appear to be linked to the affinity of the compounds for iNOS For example,...
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Báo cáo khoa họcRe-engineering the discrimination between the oxidized coenzymes NAD+ and NADP+ in clostridial glutamate dehydrogenase and a thorough reappraisal of the coenzyme specificity of the wild-type enzyme docx
... facilitating productive binding of the phosphorylated coenzyme by enlarging the potential binding pocket and removing the negative charge, likely to repel the 2Â-phosphate of NADP(H), and replacing ... after mixing) monitored at 340 nm over 250 The increase in absorbance was linear for the rst 3040 min; on this basis, the value for the specic activity was calculated as 1.84 nmolặmin)1ặmg)1, ... due to the impurities in the commercial coenzyme In addition, when commercial NADP+ was used without purication for the steady-state kinetics, an inhibitory effect of the NADH formed in the rst...
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Báo cáo khoa học: "STRUCTURE OF SENTENCE AND INFERENCING IN QUESTION ANSWERING" docx
... d elements of the meaning of the sentence) belonging to the topic of the answe@ What did John with the letters? (a letter rather than the verb being included in the topic), etc.; the criterion ... worked hard in the afternoon and he is tired in the evening, then the latter fact probably was caused by the former ~if no other cause was given in text) In our experiment of question answering we ... on it are determined by the valency frame of the governing word (included in the lexical entry of the given lexical meaning) The kind of dependency relation are specified 24 A rather general rule...
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Báo cáo hóa học: " Relationship between structural changes, hydrogen content and annealing in stacks of ultrathin Si/Ge amorphous layers" docx
... using the simulation program of ref [11], the calibration curves of Figure 2b giving the incorporated at.% of H as a function of the H flow rate were obtained The increase in H concentration in ... 76 kal/mole for SiH The faster release of H in a-Ge would cause a faster increase in the size of the H bubbles to the critical value for their explosion and formation of craters The results of ... of the IR measurements, LN made the AFM work, DLB participated in the design of the study, H-GB performed the IR measurements Competing interests The authors declare that they have no competing...
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Báo cáo lâm nghiệp:" Structure, spatial distribution and competition in mixed jack pine (Pinus banksiana) stands on clay soils of eastern Canada" pps
... W), where the forest originated from a large fire in 1923 [11] The stands are even aged The area is located at the southern tip of the Clay Belt of northwestern Quebec and is included in the ecological ... Multiple linear regressions measuring the effect of various sources of competition on DBH of jack pine trees indicated that the index combining all species was the only component retained by the stepwise ... hypothesis involves the influence of aspen wood ash which Thomas and Wein [41] showed to be detrimental to jack pine germination before its alcaline content is drained away by rain The main weaknesses...
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SOIL ORGANIC MATTER IN SUSTAINABLE AGRICULTURE - CHAPTER 3 pot
... modifications in structure along with increased mineral affiliation increase the persistence of humic constituents in soils Questions about the permanence of C sequestered in soils have fueled interest in ... measured in years for the most active fraction, in decades for the slowly decomposing pool, and in centuries or millennia for the most persistent pool (Elliott et al., 1996; Feng and Li, 2001) Efforts ... ratios in POM and in H:C of whole soils reveals the differences in the SOM described Aggradation of SOM in whole soils is reflected in increasing C:N ratios, which are associated in part with accumulation...
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SOIL ORGANIC MATTER IN SUSTAINABLE AGRICULTURE - CHAPTER 5 doc
... Cephalosporium graminearum infests the wheat roots and then grows throughout the plant by colonizing the vascular system The fungus sporulates during the winter on the infected standing straw, and the spores ... residues These organisms grow on the living plant tissues during the cropping season and then grow on or survive in the dead plant residues as they decompose on the soil surface Standing residues ... exudate inactivation, indicating that other mechanisms are involved in suppressiveness by Pseudomonas species (van Dijk and Nelson, 1998) In subsequent work investigating these mechanisms in a suppressive...
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SOIL ORGANIC MATTER IN SUSTAINABLE AGRICULTURE - CHAPTER 6 pot
... 2000) Chitin is found in the cell walls of most fungi, but is missing in Oomycetes and is present in insects and mites (Although Oomycetes have been reclassified into the Kingdom Chromista in the eight-kingdom ... data) In the soil, organic matter, metals (such as iron), clays, and other substances might bind to glomalin, causing conformational changes or masking the reactive site and thereby interfering ... to examine glomalin accumulation in sterile sand, or, as in this case, sand and crushed coal medium where the roots are contained in the root compartment within the nylon mesh bag, and the fungal...
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SOIL ORGANIC MATTER IN SUSTAINABLE AGRICULTURE - CHAPTER 8 pptx
... grain Win wheat – grain Win wheat – grain Win wheat – grain Win wheat – grain Win wheat – grain Win wheat – grain Win wheat – grain Win wheat – grain Barley – grain Barley – grain Barley – grain ... Matter in Sustainable Agriculture Crop/Component Spr wheat – grain Spr wheat – grain Spr wheat – grain Spr wheat – grain Spr wheat – grain Win wheat – grain Win wheat – grain Win wheat – grain Win ... – grain Maize – grain Maize – grain Maize – grain Maize – grain Maize – grain Maize – grain Maize – grain Maize – grain Maize – grain Maize – grain Maize – grain Maize– grain Maize – grain Maize...
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SOIL ORGANIC MATTER IN SUSTAINABLE AGRICULTURE - CHAPTER 9 pot
... of the initial total N mineralizes in the first year, 9% of the N remaining after the first year mineralizes in the second year, and 3% of N remaining after the second year mineralizes in the third ... 9.2 Soil mineral N in the spring following tomato in the previous year at the Sustainable Agricultural Farming System Project at the University of California, Davis A mixture of leguminous and ... crop strategy involves growing mixtures of small grains and legumes, providing for a range of potential residue qualities in a single input (Kuo and Sainju, 1998) After incorporating the plant mixture,...
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SOIL ORGANIC MATTER IN SUSTAINABLE AGRICULTURE - CHAPTER 10 doc
... Dryland Farming in the Inland Pacific Northwest, U.S.A Winter wheat–fallow, in which only one crop is grown every years, is the dominant cropping system in the low-precipitation dryland cropping region ... al., 1995) Cover crops aid in maintaining a viable mycelial network A cover crop of winter wheat inoculated with AM increased AM infection rate, and in turn increased the growth and yield of a ... 50% of the SOM in some soils has been lost after years of intensive tillage, clearing vegetation, and draining wetlands for farming (Cambardella and Elliott, 1993) Carbon is sequestered in soils...
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SOIL ORGANIC MATTER IN SUSTAINABLE AGRICULTURE - CHAPTER 11 (END) ppt
... and enzymatic activity in the invertebrates’ intestines In many soils, earthworms are probably the most important macroinvertebrates involved in the initial stages of recycling of organic matter ... in mixing the surface humus horizons with mineral soil in these ecosystems, forming a favorable environment for the germination and growth of spruce seedlings Elimination of earthworms from forest ... through soils MICROORGANISMS IN THE INTESTINES OF EARTHWORMS There is a great increase in the total numbers of bacteria, fungi, and actinomycetes occurring in the earthworm gut compared with those in...
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Báo cáo y học: "The relation between the incidence of hypernatremia and mortality in patients with severe traumatic brain injury" pptx
... with the result of curbing the increased urinary output At variance with urinary output, there were only nine missing values regarding serum Na and no missing values concerning DDAVP use For the ... hypertonic saline [54] In that study, hypertonic saline use increased the risk of hypernatremia, increased the number of infection days, increased the hospital length of stay, increased the creatinine ... prognostic information in the presence of CDI (hazard ratio = 0.58; P = 0.57), while retaining its importance in the other instances (hazard ratio = 4.20; P = 0.004) (P = 0.060 for the test of the difference...
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Land quality indicators and their use in sustainable agriculture and rural development pdf
... associated information system for UNEP data and information and for referencing to other data in the world, all in support of assessment and reporting activities A sub-system for land quality indicators ... monitoring staff therefore includes: ; reducing the mass of detail into clearly labelled tables; ; integrating similar materials from various parts of the information system; ; assembling results ... contributing to the development of indicators at each of these levels although the main emphasis is on building national indicators The Forestry Department, for example, is actively supporting the...
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Báo cáo lâm nghiệp:"Relationships between soil factors, Quercus robur health, Collybia fusipes root infection and Phytophthora presence" doc
... taking into account only trees sampled in summer or spring or sampled in winter but with a positive baiting for P quercina For P europaea, only trees sampled in winter or spring or sampled in ... successful baiting, were used in the analysis For P syringae-like1, only trees sampled in winter or sampled in summer and spring but with a successful baiting were included in the analysis The statistical ... on three other oaks in Mersuay, three oaks in Filain and two in Ainvelle In these cases Armillaria was present on a minority of roots, inducing superficial lesions, the root infection index was...
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Soil pH and Organic Matter pptx
... cations in solution so they can diffuse through the soil to the root This is accomplished by the chelate forming a ‘ring’ around the metal cation that protects the metal from reacting with other inorganic ... releasing the metal Both cases result in the metal being taken up by the root and the chelate returning to the soil solution to bind other metals Chelation may be particularly important for regions ... mineralization In addition to nutrient storage, SOM aids nutrient availability by increasing the soil’s CEC, providing chelates, and increasing the solubility of certain nutrients in the soil solution Furthermore,...
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