most areas of the world where rainfall is limiting are characterized by low agricultural output and, ironically, high population growth rates that generate increased food de-mand. arid and semi-arid regions permit a range of vegetative biomass production, from rainfed crops to native pasture, and sparse steppe shrubs to true desert. given the harsh climatic conditions in areas such as west asia...

to identify and characterize bread wheat (triticum aestivum l.) genotypes adapted to terminal water deficit conditions, 51 superior hexaploid wheat genotypes together with commercial check cultivars were studied, in a two stages screening practice, for drought tolerance in karaj, kermanshah, isfahan, neishabour and varamin filed stations under terminal water deficit conditions in 2002-2005 grow...

Cereal crops mainly cultivated as a rainfed crops, where grain yield is often limited by terminal drought stress. Therefore, ability of plants to withstand drought is an important aspect of crop production in water limited conditions. In this context grain yield is closely related to post-anthesis water availability. Hence, grain yield can be increased by restricting pre anthesis water use to m...

alfalfa is the best known fodder crop with high ability of biological nitrogen fixation and drought tolerance in dry, pannonian region of east austria. different morphological and physiological characteristics of 18 alfalfa genotypes from different geographical origins, 8 iranian ecotypes and 10 european cultivars were evaluated under irrigated and rainfed conditions during 2006-08 cropping sea...

The sustainability of the natural resources used in agricultural production is essential to meet future food needs population. It necessary understand characteristics climate and soil changes through agroclimatic zoning models, even with non-existent or limited climatic edaphic databases, avoid a decline production. objective study was determine accuracy Global Agroecological Zoning (GAEZ), ECO...

Determining the effect of irrigated and rainfed conditions on light interception, extinction coefficient (k), radiation use efficiency (RUE), biomass, storage root accumulation cassava was objective this study. The field experiment arranged in a randomized complete block design (RCBD) with four replications. water were evaluated under two planting dates for years. Light interception depended k ...

A multi-temporal/multi-sensor field experiment was conducted within the Soil Moisture Measurement Stations Network of the University of Salamanca (REMEDHUS) in Spain, in order to retrieve useful information from satellite Synthetic Aperture Radar (SAR) and upcoming Global Navigation Satellite Systems Reflectometry (GNSS-R) missions. The objective of the experiment was first to identify which ra...

Temporal NDVI signatures of the following land cover types in the Aral Sea Basin (ASB) were analyzed in MODIS data 2000–2012: Wetlands, bare land, water surfaces, natural vegetation and rainfed agriculture (in mountainous regions), low vegetation, rice cropping systems. Only the last class refers to cropland. All other classes were targeted to separate non-cropland or rainfed agriculture from t...

Land suitability maps are useful tools for protecting soil resources. The main objective of this study was to elaborate and assess different rainfed irrigated crops. This conducted in the North-East area Tunisia, three speculations were adopted (Cereals, arboriculture vegetable crops) both conditions. Arithmetic multiplication methods used based on Food Agriculture Organization (FAO) classifica...

Climate change can reduce crop yields and thereby threaten food security. The current measures used to adapt to climate change involve avoiding crops yield decrease, however, the limitations of such measures due to water and other resources scarcity have not been well understood. Here, we quantify how the sensitivity of maize to water availability has increased because of the shift toward longe...