Résultats de la recherche (148 résultats)

Affinez votre recherche

Par Collection Par Auteur Par Date Par Sujet Par Titre
  • The wheat trap.
  • A study of the attempts to grow wheat with irrigation in Northern Nigeria. - (EMS)
  • A study on moisture conditions for winter wheat and summer maize production in the Heilonggang area of Hebei Province
  • Agricultural climatology;Agroclimatology ; China ; Drought ; Irrigation ; Maize;Corn ; Precipitation ; Soil moisture ; Water resources ; Wheat
  • Winter wheat and summer maize are two important crops in the Heilonggang area which is the driest part of the North China Plain. The thermal-light conditions are satisfactory for double cropping of winter wheat-summer maize, but rainfall
  • is deficient for two crops. Wheat production in this area should be restricted to a scale which is suitable to water resources conditions, while maize production can be further developed.
  • A new look at some old evidence: the wheat market scandal of 1925
  • Observations on the geography of wheat production instability
  • The article compares the instability of wheat production for all countries during the period 1956-1981. An index has been calculated for eight classes of instability. The spatial configuration of wheat production is graphically displayed
  • Impacts and uncertainty analysis of elevated temperature and CO2 concentration on wheat biomass
  • Adaptation ; Agroclimatology ; Biomass ; Carbon dioxide ; China ; Climatic change ; Climatic warming ; Forecast ; Irrigated farming ; Model ; North-Eastern China ; Northern China ; Probability ; Scenario ; Southwest China ; Wheat
  • Four agrometeorological sites located in wheat production areas, Harbin, Jinan, Zhengzhou and Chengdu were chosen to study the impact on wheat biomass with rise of temperature and CO2 concentration in many scenarios with the help of the process
  • mechanism model in the probabilistic forecasting method. The results show that the CO2 fertilization effect can compensate reduction of wheat biomass with warming temperature in a strong compensating effect. Under the CO2 fertilization effect, the rain-fed
  • and irrigated wheat biomasses increase respectively, and the increment of biomass goes up with temperature rising. The rain-fed wheat biomass increase is greater than the irrigated wheat biomass. Without consideration of CO2 fertilization effect, both irrigated
  • and rain-fed wheat biomasses reduce, and there is a higher probability for the irrigated wheat biomass than that of the rain-fed wheat biomass.
  • Hazank éghajlata és a minoségi buzatermo területek el-helyezkedése kozotti osszefüggés. (The relationship between the climate of Hungary and the localisation of the cultivable lands of outstanding quality wheat)
  • Despite the substantial changes of the spacies and the agrotechnics during the last 100 years no alteration occurred in the territorial localization of the cultivable lands of good resp. low-grade quality wheat. (CK).
  • Oligopoly pricing in the world wheat market
  • of the triopoly for the future wheat prices are discussed in the final two sections. (INRA).
  • The effect of rock fragments on wheat biomass production under highly variable moisture conditions in Mediterranean environments
  • Agropedology ; Biomass ; Catena ; Mediterranean area ; Rock ; Slope ; Soil ; Soil properties ; Soil water ; Wheat
  • The objective of this study was to document the relationships among biomass production of rainfed wheat and those soil properties that affect water availability such as soil depth, rock fragments, parent material and degree of erosion along
  • Water status in winter wheat grown under salt stress
  • Agroclimatology ; Arid area ; China ; Evapotranspiration ; Hebei ; Land use ; Microclimate ; Saline soil ; Salinity ; Soil properties ; Wheat
  • Properties of the soil surface layer, the temporal pattern of the microclimate variables as well as crop condition were combined to analyze the characteristics of the evapotranspiration from winter wheat fields in a saline soil area. The objectives
  • History and ethnobotany of wheat in India
  • Wheat production in India : the regional dimension
  • The estimation and evapotranspiration of wheat field - An improved energy-aerodynamic resistance model
  • Atmospheric pressure patterns, climatic change, and winter wheat yield in North America
  • The Chicago wheat future markets: recent problems in historical perspective
  • The effect of climatic factors on the hectare yields of barley, oats and spring wheat in Finland in 1972-77
  • Climate and high-yielding variety wheat yield
  • Limits reaffirmed : new wheat frontiers in Australia, 1916-1939
  • Australia ; Farm ; Frontier ; Historical geography ; Land development ; New South Wales ; Pioneer fringe ; Settlement ; South Australia ; Wheat ; Years 1920-29 ; Years 1930-39
  • South Australia and New South Wales legislated the resumption of certain pastoral areas for re-allocation as primarily wheat-based farmlands that would provide the heavier rural population sought by politicians. The need to reward soldiers
  • for service in the First World War became a major stimulus to expansion. The authorities blamed the settlers when the new wheat frontier proved to be expensive. Even the soldier settlers ultimately achieved a success rate comparable to that of the civilian
  • Impact of the shrinking winter wheat sown area on agricultural water consumption in the Hebei Plain
  • Agriculture ; China ; Crop ; Hebei ; Irrigation ; Maize ; Season ; Water resources ; Wheat ; Winter
  • This article examines the impact of the shrinking winter wheat sown area on agricultural water consumption in the Hebei Plain (China). The results are as follows. 1)The sown areas of winter wheat in the 11 cities in the Hebei Plain all shrunk during
  • the study period, the most serious being in the Beijing-Tianjin-Tangshan metropolitan agglomerate. 2) The irrigation water resources demanded by the winter wheat-summer maize double cropping system ranged from 400 mm to 530 mm, while those demanded
  • by the spring maize single cropping system ranged only from 160 mm to 210 mm. 3) The water resources conserved as a result of the winter wheat sown area shrinkage during the study period were about 15.96×108 m3/a, accounting for 27.85% of those provided
  • Cointegration between U.S. wheat markets
  • Autoregressive process ; Forecast ; Harbour ; Kansas ; Market ; Price fixing ; Statistics ; Storage site ; Texas ; Time series ; Transport cost ; United States ; Wheat
  • Studies on the impact of winter climate on rubber and wheat cultivation in the mountains of southern China
  • Agricultural climatology;Agroclimatology ; China ; Cluster analysis ; Mountain ; Multivariate analysis ; Southern China ; Subtropical zone ; Wheat ; Winter ; Zoning