Understanding how natural ecosystems are and will be responding to climate change is one of the primary goals ecological research. Plant phenology accepted as most sensitive bioindicators due its strong interactions with dynamics, a vast number studies from all around world present evidence considering phenological shifts response climatic changes. Land surface (LSP) also valuable tool in absen...

abstract the critical period of weed control (cpwc) is a period in the crop growth cycle during which weeds must be controlled to prevent yield losses. in order to determine the critical period of weed control (cpwc) of corn in hamedan, an experiment was conducted in 2007 at agricultural research station of bu-ali sina university of hamedan. the experiment was carried out as a randomized comple...

Abstract In this paper, we developed an open-source package to analyze the overall trend and responses of both carbon use efficiency (CUE) corn yield climate factors for contiguous United States. Our algorithm enables automatic retrieval remote sensing data through Google Earth Engine (GEE) U.S. Department Agriculture (USDA) agricultural production at county level application programming interf...

Accurate assessment of crop nitrogen (N) status and understanding the N demand are considered essential in precision management. Chlorophyll fluorescence is unsusceptible to confounding signals from underlying bare soil closely related plant photosynthetic activity. Therefore, sensing a promising technology for monitoring status, even at an early growth stage. The objectives this study were eva...

Yield prediction before harvesting is one of the tools in order to planning food production supply in future.Yield prediction was carried out for Wheat(Triticum aestivum) using different meteorological variables with agrometeorological indices in Hamedan district during 2003-04 and 2004-05. According to correlation coefficients, standard error of estimate as well as relative deviation of predic...

Needs of human life from the beginning been an important factor We have been threatened by population growth, food security and human well- Men of science and technology with a new plan Maintain and improve their food security to make it work. In this investigation, meteorological data have been received from synoptic stations based on daily, monthly, and annually trend from Iran Meteorological...

abstractbackground and objectives: all changes in the development stages of plants results in the change of one or more yield components and finally, the ultimate yield and manipulation of these periods means to create new possibilities for increasing yield. accordingly, planting date has a significant impact on plant growth and development during the growth season, so that any shift in plantin...

Needs of human life from the beginning been an important factor We have been threatened by population growth, food security and human well- Men of science and technology with a new plan Maintain and improve their food security to make it work. In this investigation, meteorological data have been received from synoptic stations based on daily, monthly, and annually trend from Iran Meteorological...