Soil fertility in the mid-elevation hillsides of the Cochabamba region of Bolivia has been declining as natural fallow times have been reduced in order to bring more land into crop production. A photothermal model is used to simulate climate
conditions for 12 legume cover crops in three hillside locations. Tropical legume crops are found to be suitable at different elevations, from 2,500 m to 3,500 m. - (SLD)
A method to predict workability of arable soils and its influence on crop yeild in Impact of water and external forces on soil structure. Selected papers of the 1st Workshop on soilphysics and soilmechanics, Hannover 1986.
This paper indicates how workability and its dependence on soil and weather and its influence on crop yield can be quantified by using a model approach.
This paper investigates the performance of selected soil and water conservation measures in the highlands of Ethiopia and Eritrea, namely Fanya Juu, soil/stone bund, grass strips and double ditches. The impact of these techniques on runoff, soil
loss, crop yield and biomass production is measured at on-farm experimental sites in 7 research sites under different agro-ecological conditions.
Agropedology ; Andes ; Choice ; Colombia ; Cropselection ; Decision ; Farm ; Land use
Based on a study of farmers' decisions regarding land use type (forest, pasture, fallow or crop) and crop choice in the Columbian Andes, the paper shows that despite farmers' detailed knowledge of the diverse soil conditions in the area, other
factors (farm size, market and input-related concerns) are more important for farmers' actual choice of land use type and crop.
Agricultural modernization ; Agriculture ; Biodiversity ; Cropselection ; Ecology ; Impact ; Scale ; Sustainable development ; Tanzania
local varieties are or become inappropriate for the social, economic and crop-specific conditions and opportunities prevailing among farmers. Two case studies, based on fieldwork in Tanzania, illustrate the causes and its impact on affected communities
Grundlagen für den Vergleich von Standortbedingungen der landwirtschaftlichen Pflanzenproduktion. (Fundamentals for comparing site conditions of agricultural crop production)
Comparison levels for important site-specific data are indicated as an aid for carrying out site comparisons of land-use units. These levels are based on the soils suitability for the cultivation of selectedcrops. Site data are arranged according
In the topical study attention was focussed on a particular commodity and its distribution and production was analysed while in the regional study an area was selected and its agricultural problems, or the dominance of crops in relation
A method for characterizing the state of compactness of an arable soil in Impact of water and external forces on soil structure. Selected papers of the 1st Workshop on soilphysics and soilmechanics, Hannover 1986.
The method, described here, gives a useful characterization of the state of compactness of an annually tilled soil layer from a biological point of view. The main goal was to develop a method, giving maximum crop yield with the same degree
Effect of whelling with heavy machinery on soil physical properties in Impact of water and external forces on soil structure. Selected papers of the 1st Workshop on soilphysics and soilmechanics, Hannover 1986.
in spring-time time with higher pressure, are evident for the degree of compaction over the vegetation period and in crop yield.
The only possible explanation for labor productivity growth appears to be selective modernization of agriculture, largely based on land augmenting modern inputs. The output per unit of land greatly increased and made possible the expansion of higher
market value crops, without any increase in labor input.
The results of the topoclimatical measurements at air temperature in the region of the Pavlovské vrchy Hills (S. Moravia) with a lot of tables, figures and maps. Method of application of selected statistical criteria in the determination
of confidence belts for samples of minimum temperatures for crop production. (MS).
Crop-growth simulation models need long-term daily weather data to assess possible modifications in farm production in changed climatic conditions. Here, is presented a stochastic weather generator LARS-WG that provides synthetic long time series
of climatic elements. The generator gave an adequate simulation of weather parameters for a selected station (Zamość) in Poland and was next applied to construct climate change scenarios on the basis of UKTR model data.
represented through changes in land use, cropselection and farming practice will be more difficult to predict. Approaches to the forecasting of prospective soil erosion must focus at the interaction between affected environmental processes and human-induced
from vegetable crops, but most lost money. Timber trees (usually Eucalyptus) and fruit trees were usually planted to rejuvenate the fallow lands. Authors call for study to select proper tree species and tree/vegetable systems. - (SLD)
Biogeography ; Cartography ; River ; Slovenia ; Succession of crops ; Vegetation
This article presents a biogeographic analysis of vegetation on point bars. The results are based primarily on an analysis of off-road mapping, which was conducted in nine selected point bars of the upper stream of the Sava River. Human interference
evapotranspiration data analyzed for the period between 1959-1990. It is observed that the occurence of onset and cessation of the rains in Nigeria is generally erratic. The significance of the observations of the study to selection of crops for cultivation
A two-dimensional finite element stress model was applied to the analysis of six selected rock columns formed in welded, horizontally jointed tuff in the Chiricahua Mountains, Arizona. The modelling revealed that failure because of slip along
inclined joints penetrating the rock was much more likely. The uniformity of column heights suggests that either rare, high velocity winds or prehistoric seismicity cropped the previous generation of columns to seismic shaking.