Cropping techniques in the Tropics for soil conservation and soilimprovement
Contour cultivation, the establishment of contour ridges and contour hedges, the best suited way of tilling, are some of the great number of proven techniques which could be employed simultaneously for soil conservation and soilimprovement. - (L'A.).
Combining soil map and soil analysis for improved yield prediction
Exploratory study on how the farmer can decide, which of the three alternatives (soil map, soil analysis or their combination) should be used as a basis for predicting the most appropriate agricultural land use or management. It is illustrated
Improving aggregate stability of sodic sandy loam soils by organics
The objective of this study was to examine at different application rates the effectiveness of some natural and synthetic organics in improving aggregate stability of sodic soils. An attempt has also been made by multi-index approach to select
Improving the bearing capacity of top soil layers by means of a polymer mixture grout in Impact of water and external forces on soil structure. Selected papers of the 1st Workshop on soilphysics and soilmechanics, Hannover 1986.
In this paper the discussion is opened towards the application of polymers for soil stabilizing problems. It is shown some geotechnical improvement can be expected with non-toxic polybutadiene polymers| although the economical considerations must
amendment agent for improvingsoil physical characteristics.
The aim of this study was to determine the effects of diatomite application on physical characteristics of soils with different textures (sandy loam, loam, and clay), under laboratory conditions. The results indicated that diatomite applications
significantly increased aggregate stability of all the experimental soils in all aggregate size fractions and also soil moisture content at field capacity in Sandy Loam textured soil. Therefore it is suggested that the diatomite may be considered as a soil
[b1] Fac. of Agriculture, Dep. of Soil Science, Atatürk Univ., Erzurum, Turquie
An improved rainfall erosivity index obtained from experimental interrill soil losses in soils with a Mediterranean climate
Catalonia ; Experimentation ; Index ; Mediterranean area ; Precipitation ; Soil erosion ; Spain ; Splash ; Water erosion
The goal of this work was to improve rainfall erosivity indices for the Mediterranean conditions from experimental interrill soil losses measured in natural conditions in 1-m2 plots. The plots were located in 3 vineyard fields, whose soils
are classified as Typic Calcixerept, Typic Xerofluvent and Typic Xerorthent, and ploughed at the same time as the vineyards. Soil losses and runoff were collected after each rainfall event during 1 year and rainfall data were obtained from bucket gauges installed
. It is highlighted that RHA increases the optimum moisture content (OMC) of soil, and decreases the soil compactibility. It is concluded that RHA promotes the aggregate stability, thus improves the workability of soil.
This paper evaluates the effects of rice-husk ash with different rates of 0%, 10%, 20%, and 30% (v/v) on soil consistency limits (liquid limit, plastic limit) and soil compactibility parameters in Shanghai soils with different textures
Application of fuzzy logic-based modeling to improve the performance of the Revised Universal Soil Loss Equation
Erodibility ; Experiment plot ; Fuzzy logic ; Linear regression ; Model ; Modelling ; Soil erosion ; Soil properties ; United States of America
This paper discusses the application of fuzzy logic-based modeling to improve the performance of the Revisited Universal Soil Loss Equation (RUSLE). An analysis of over 1700 plot-years of data, taken from more than 200 plots at 21 sites in the U.S
., showed that soil erosion was not adequately described merely by the multiplication of 5 RUSLE factor values in all cases. The fuzzy logic-based modeling approach was to make the RUSLE's structure more flexible in describing the relationship between soil
Appraisal of World Reference Base for soil resources - from a nordic point of view
Comparative study ; Cultivated land ; Denmark ; Europe ; Finland ; Human impact ; Northern Europe ; Norway ; Podsol ; Soil ; Soil classification ; Soil properties ; Sweden ; Taxonomy
. This paper will propose changes to the WRB in order to improve the performance of the system for Nordic soils.
The WRB (World Reference Base for Soil Resources) classification of 13 different soils from Denmark, Finland, Norway and Sweden, is comparedwith the FAO and Soil Taxonomy classification. This highlighted some of the classification problems
Soil nutrients in eroded granitic areas of south China
The AA. try to assess the nutrient status of the soils, both in the upland and the lowland areas, to examine the nutrient losses, and to determine needs for the improvement of agricultural soil fertility. Results from this study may broaden
the knowledge of land-use effects on tropical soils.
Erozia pôd Sarisskej vrchoviny. (Soil erosion in the Sarisska vrchovina Mts)
of agricultural soils. The improvement of a complex soil-conservation inventions and erosion control is necessary (MS).
By analysing the particular factors and conditions of soil erosion and by measuring the intensity of erosion processes in the area of Sarisska vrchovina highlands has been stated that erosional water activity deteriorate here above 80 percent
Effect of rice husk biochar and coal fly ash on some physical properties of expansive clayey soil (Vertisol)
Agropedology ; China ; Northern China ; Porosity ; Soil ; Soilimprovement ; Soil properties ; Soil water ; Vertisol
strength and coefficient of linear extensibility (COLE) of clayey soil. The RHB and CFA are therefore able to improve the physical quality and swelling–shrinkage status of expansive clayey soils, being a potential soil amendment for improving poor physical
of an expansive clayey soil (Vertisol). Results indicate that : the RHB promotes the formation of macroaggregates and resists aggregate slaking; RHB and CFA change the pore size distribution and increase larger pores of soil; RHB and CFA decrease the tensile
characteristics of the clayey soil.
[b1] Zhejiang Provincial Key Lab. of Subtropical Soil and Plant Nutrition, College of Environmental and Resources Sciences, Zhejiang Univ., Hangzhou, Chine
incubation time. A simulated rainfall event was performed to estimate soil loss for all treatments at the end of the incubation time. Experimental results indicate that applying biochar improved the physicochemical and biological properties of the highly
weathered soils. A 5% application rate of biochar is considered as suitable for highly weathered soil because this application rate efficiently improvessoil physicochemical properties and reduces soil loss.
[b1] Dept. of Soil and Water Conservation, National Univ. of Science and Technology, Pingtung, Taiwan, Province de Chine
Freezing effects on aggregate stability of soils amended with lime and gypsum
Soil surface sealing and crusting
Agropedology ; Clay mineral ; Cultivated land ; Freeze-thaw cycle ; Land improvement ; Soil ; Soil properties ; Soil water ; United States of America
The objectives of the laboratory study were to determine the effects of freeze-thaw cycles, water content at freezing, and lime and gypsum additions on the aggregate stability of 6 agriculturally important US soils differing in texture, mineralogy
Agricultural practice ; Amazon Basin ; Brazil ; Human impact ; Land use ; Soil ; Soilimprovement ; Soil properties
Study of fertile and dark patches of soils (Indian black earth) near Santarém, Brazil. Soils were found to be anthropogenic in origin, with most produced through soil management practices in agricultural zones and only small porions showing clear
evidence of human habitation (i.e., the midden model). Ash and organic matter were deposited to form these patches. Fertility of the soils has persisted long after cultural manipulation has ceased. - (SLD)
Improvements to the dispersion status of piped gully soils following reworking and stabilisation by vegetation
Colorado ; Erosion control ; Geochemistry ; Gully erosion ; Marl ; Soil erosion ; Soil properties ; United States of America ; Vegetation ; Watershed
The physical and chemical properties of sodic gully bank soil material, deposited as in-channel sedimentary structures below a pipe system in alkaline marls, Colorado, were re-analysed for their dispersive status using a new methodology
. The original samples were taken from in-gully sedimentary structures with differing densities of established vegetation cover. The results showed that the use of salt-tolerant species in bio-reclamation of dispersive soils could reduce the need for gypsum
amendments, and reinforces the value of the site signature approach to dispersive soil analysis.