The status and fluxing of alkali and alkaline-earth metals in a savanna alfisol under long-term cultivation
Agropédologie ; Argile minéral ; Dégradation des sols ; Engrais ; Géochimie ; Métaux alcalino-terreux ; Métaux alcalins ; Nigéria ; Savane ; Sol cultivé ; Sol lessivé ; Utilisation agricole du sol
Agricultural land use ; Agropedology ; Clay mineral ; Cultivated land ; Fertilizer ; Geochemistry ; Nigeria ; Savanna ; Soil degradation
This study investigates the impact of soil management on the status and fluxes of alkali and alkaline-earth metals in a savanna alfisol after 50 years of cultivation. The objective is to determine a suitable management practice which can best
protect savanna soils against rapid degradation and potential acidification under long-term cultivation.
Agriculture ; Guinea ; Mathematical model ; Model ; Population growth ; Shifting cultivation ; Simulation
This paper will present a computer model of a certain class of agricultural systems, termed shifting cultivation systems. The objective of modeling is to demonstrate how such decision rules control overall system behaviour, and to study the response
This article addresses the trends, problems and opportunities attending the cultivation and marketing of medicinal and spice plants in Germany. The years since 1993 have seen an expansion in their cultivation to a current area of some 10,000
hectares. Using the present state of cultivation and the developments over the last few years as his basis, the A. examines the measures required to maintain the continued stable growth of these specialist crops. - (MT)
Arboriculture ; Cultivated plants ; Diffusion ; Documentation ; Food crop ; Fruit ; Latin America ; Vegetables
Liste non exhaustive, classée alphabétiquement, des noms des plantes cultivées introduites en Amérique latine depuis 1492 donnant le nom scientifique et le nom de la famille botanique, les noms communs (en français, en espagnol, en portugais et en
Interrill erosion on cultivated Greek soils : modelling sediment delivery
Bilan sédimentaire ; Ecoulement ; Erosion des sols ; Erosion hydrique ; Grèce ; Modèle ; Parcelle expérimentale ; Sol cultivé
Cultivated land ; Experiment plot ; Greece ; Model ; Runoff ; Sediment budget ; Soil erosion ; Water erosion
The aim of this work was to investigate under field conditions and natural rainfall events, the effect of some selected parameters on single storm interrill runoff and sediment delivery, on cultivated soils in central Greece, and to develop
A talajmüvelés hatasa tokaj-Hegyalja talajainak viznyelésére és vizateresztésére. (The impact of cultivation on the water infiltration and permeability of soils in the Tokaj-Hegyalja region)
Agriculture ; Cycle de l'eau ; Eau du sol ; Expérimentation ; Géographie de l'Europe ; Hongrie ; Humidité du sol ; Infiltration ; Perméabilité du sol ; Sol ; Surface cultivée ; Tokaj Hegyalja ; Utilisation du sol
Various crops, cultivation methods, soil moisture conditions and conséquences on large-scale farming are studied in the Bodrogkeresztur half-basin model area. Both field and laboratory data support the authors'conclusions that soils in the area
are mostly of poor to very poor water budget category. The benefitial influence of regular and careful cultivation on soil properties. (DLO).
Understanding cultivated land dynamics and its driving forces in northern China during 1983-2001
AVHRR ; Chine ; Chine du Nord ; Couvert végétal ; Ecologie ; Indice de végétation ; NOAA ; SPOT ; Sol cultivé ; Système d'information géographique ; Télédétection ; Utilisation du sol
AVHRR ; China ; Cultivated land ; Ecology ; Geographical information system ; Land use ; NOAA ; Northern China ; Plant canopy ; Remote sensing ; SPOT ; Vegetation index
Based on the long-term serial NOAA/NDVI dataset during 1983-1999 and SPOT/VGT dataset in 2001, the land use/cover change information in the 13 provinces of northern China was extracted based on the analysis of the cultivated landscape
characteristics at first, then the effects of human activities on cultivated land process were explored by GIS and the driving forces of cultivated land change were investigated.
Erosion des sols cultivés : fatalité ou responsabilité humaine? L'exemple du vallon de Pescheray (commune du Breil-sur-Mérize, Sarthe)
Action anthropique ; Agropédologie ; Erosion des sols ; France ; Pays de la Loire ; Ruissellement ; Sarthe ; Sol cultivé ; Système de culture
Agropedology ; Cultivated land;Cultivated soil ; Farming system ; France ; Human impact ; Pays de la Loire ; Rill wash;Runoff ; Sarthe ; Soil erosion
L'étude géographique du vallon de Pescheray permet de comprendre la localisation des figures d'érosion dans les sols cultivés des campagnes sarthoises. Sans remettre entièrement en cause les systèmes de culture actuels, l'A. pense que des solutions
With the main purpose of determining the annual soil loss rates in cultivated areas of central Navarre, a detailed assessment of rainfall and of rill and gully erosion was made in 19 small catchments from October 1999 to September 2001. 17 of them
were randomly selected, and were cultivated with winter cereals, vineyards or sunflowers. The other 2 catchments were selected to represent partially uncultivated lands abandoned for 10 years. Other previous information available from 1995 to 2001
The principal objectives of this study were to assess the spatial variability of 137Cs within a cultivated field, (central Saskatchewan, Canada), and to examine the influence of grid size and positioning on estimates of sediment redistribution.