نتایج جستجو برای: crop simulation model
تعداد نتایج: 2511500 فیلتر نتایج به سال:
38 The development and application of cropping system simulation models for cotton production has 39 a long and rich history, beginning in the southeastern United States in the 1960's and now expanded to 40 major cotton production regions globally. This paper briefly reviews the history of cotton simulation 41 models, examines applications of the models since the turn of the century, and identi...
water balance components are difficult to measure in short intervals because their measurement is time consuming and costly. therefore, soil-water--plant models can be used for prediction of these components. in this study, to predict grain yield and evaluate water use efficiency, an agro-hydrological model, namely, swap was used. this study covered a 10-years period from 2000-2010. based on th...
The challenge of converting global agricultural food, fiber and energy crop cultivation into an ecologically and economically sustainable production process requires the most efficient agricultural management strategies. Development, control and maintenance of these strategies are highly dependent on temporally and spatially continuous information on crop status at the field scale. This paper i...
abstract: mineral scaling in oil and gas production equipment is one of the most important problem that occurs while water injection and it has been recognized to be a major operational problem. the incompatibility between injected and formation waters may result in inorganic scale precipitation in the equipment and reservoir and then reduction of oil production rate and water injection rate. ...
nitrogen is one of the most important nutrients in crop production, but it's losses to the environment is harmful. the sundial model (simulation model of n dynamics in the soil) was used to quantify the cycle of n and it's losses in different production systems of sugar beet (beta vulgaris l.) in former khorasan province, east of iran. the data were collected from traditional, semi-me...
A with the introduction of many new With the development of automated weather station technologies, whether it be medical, mechanical, networks in the early 1980s, hourly values of temperaor Internet related, are promises; sometimes, too many ture, solar radiation, precipitation, relative humidity, promises are made about the potential capabilities of wind direction, and wind speed become avail...
Crop models are increasingly used to simulate crop yields at the global scale, but so far there is no general framework on how to assess model performance. Here we evaluate the simulation results of 14 global gridded crop modeling groups that have contributed historic crop yield simulations for maize, wheat, rice and soybean to the Global Gridded Crop Model Intercomparison (GGCMI) of the Agricu...
A simulation model was developed to estimate the effect of deficit irrigation upon crop yield. The model was designed to provide relative yield estimates for numerous combinations of irrigation system, crop growth and irrigation management parameters. A daily soil moisture balance was used to predict evaporation and transpiration from which crop yields were estimated. Gross irrigation water req...
background and objectives: sugar beet (beta vulgaris l.) is the major crop in khorasan province which is mainly grown in spring. however, autumn sowing has a lot of advantages including lower crop water requirement and higher water use efficiency. accordingly, this research was performed to compare the yield of storage organ in spring and autumn-sown sugar beet and determine the most appropriat...
Respiration has a profound influence on crop yield because dry matter accumulation by a crop is closely related to assimilation of CO and respiratory activity. This paper describes the development of a 2 simulation model for respiration in wheat. While the growth respiration can be assumed to be proportional to the assimilation of CO , the model concentrated on the effects of biotic and environ...
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