Mathematical modeling has been used to describe the characteristics of crop growth. Establishing a growth model can help better understand responses crops their environment and improve efficiency agricultural production. This study establishes empirical models predict greenhouse tomato. In this study, we collected beef tomato (Solanum lycopersicum cv. ‘993?) data over two seasons in Taiwan esta...

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...

in order to investigate of quality and quantity yield and growing degree day (gdd) of plantago ovata and p. psyllium related to water stress and density, two experiments were conducted at the agriculture research field, tehran university, karaj, in april 2005 and 2006. the experiments were designed in factorial experiments based in randomized completely block (rcb) with three replication in whi...

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...

Poa genus has a high value for grazing and forage conservation concerning thelivestock. In order to study the impacts of cold temperature and Growing Degree Days(GDD) on seedling morphological trait and phonological development of two speciesinvolving Poa pratensis and Poa trivialis, this research was conducted in laboratory andgreenhouse and outdoor of Research Institute of Forest and Rangelan...

Growing degree days (GDD) is a tool to predict plant growth and can be adapted for use in any species, including cover crops. A limitation of the GDD calculation accurate temperature parameters used development. For most crop cardinal temperatures are not well defined literature, leading less GDD. The objective this study was determine eight Austrian winter pea (Pisum sativum), balansa clover (...

In this study, we analyzed the relationship between days after planting or growing degree (GDD) and number of labor hours spent on stem training, pruning, harvesting sweet pepper cultivated in commercial glass greenhouses. A model was developed for estimating according to plant height. three large-scale (>1 ha) greenhouse sites (1, 2, 3), weekly growth height, fruit, yield were measured manuall...

Annual stem length growth of the circumarctic dwarf shrub Cassiope tetragona has proven to be a reliable proxy for past and ongoing climate change in the Arctic. This reliability is based on its strong linear relationship with monthly climate parameters. Monthly means are however coarse units for prediction of growth in marginal regions with short growing seasons. Growing degree-days (GDD) are ...

Northeast China (NEC) is one of China’s major rice production areas and has experienced obvious climate warming over the past three decades, similar to other midto high-latitude regions in the Northern Hemisphere. The present study investigates the temporal and spatial impacts of climate warming on rice yield in mid–high latitude regions. In this study, two time series datasets of rice yield an...