搜索结果: 1-10 共查到“农学总论 soil structure”相关记录10条 . 查询时间(0.236 秒)
Intersecting-surfaces approach to soil structure
surface- and volume-like objects pores grains aggregates
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2008/11/26
The large number of intersecting surfaces in a volume divides the latter into small sub-volumes. Each of the sub-volumes is outlined or nearly outlined by parts of the intersecting surfaces. A number ...
Advantages of application of the backscattered electron scanning image in the determination of soil structure and soil constituents
backscattered electron scanning image soil structure soil components
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2008/11/26
Submicroscopic techniques can be broadly subdivided into the study of micromorphology and imaging of the arrangement of the soil particles and voids, and the microchemical analysis of soil components....
Accessibility of most frequently used physical parameters of soil structure, reliability of measured values, lack of replicates andways out of this dilemma
bulk density saturated hydraulic conductivity limited data-sets outflanking techniques
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2008/11/26
Assessment of soil structure and still more its changes is impeded by peculiarities of sampling and measurement. Unavoidable local destructions tend to advance use of small numbers of replicates, samp...
Impact of the long-term straw supply on loess-derived soil structure
plant residues slaking soil structural properties organic matter
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2008/11/26
Keeping plant residues on the field and incorporating them instead of removing or burning them, is a well-known practice in soil and water conservation. One of the objectives of this management is to...
Impacts of soil structure on crop growth
soil structure parameters simulation modelling root distribution crop growth
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2008/11/24
Intensive agricultural utilisation of soils may change the structural status and through it the credibility and fertility of soils. Since soil structure has not been quantified explicitly, studying st...
Scale cutoffs and the limits of fractal soil structure
fractals soil structure bulk density porosity soil organic matter
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2008/11/13
with a scaling factor ranging between b=1.66 and b=6.41. Both the maximum number of model iterations, imax, and n correlated positively with soil organic carbon. Knowing the limits of fractal behavio...
Relations between soil structure, number of selected groups of soil microorganisms, organic matter content and cultivation
soil structure microorganisms organic matter cultivation system
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2008/11/12
The aim of this work was to fiut relations between the number of selected groups of soil microorganisms, water stability of soil aggregates, soil porosity and the organic matter content on the basis o...
Seasonal variation of some soil structure indicators
polysaccharides aggregation soil structure
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2008/11/12
Seasonal changes of soil carbohydrate and root weight were studied for the grey forest soil at different phases of the growth of barley. The soil structure was characterized simultaneously by soil ag...
Soil structure as an ecology forming factor
soil structure simplex-lattice plan optimization combined machine
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2008/11/11
The aim of the investigations consisted in determination of the optimum ratio of structural components in the sowing layer of the chernozem on cultivation of cereal ear crops and development of a comb...
Soil structure parameters in models of crop growth and yield prediction. physical submodels
soil structure parameters crop growth and yield prediction models physical submodels
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2008/11/11
The role of chosen soil structure parameters in models of crop growth and yield prediction has been analysed on the base of the review of the latest literature. It was stated that the most frequently ...