نتایج جستجو برای: agricultural crop growth models

تعداد نتایج: 1799822  

2014
Matthew H. Meisner Jay A. Rosenheim

Crop rotation has been practiced for centuries in an effort to improve agricultural yield. However, the directions, magnitudes, and mechanisms of the yield effects of various crop rotations remain poorly understood in many systems. In order to better understand how crop rotation influences cotton yield, we used hierarchical Bayesian models to analyze a large ecoinformatics database consisting o...

2011
Benjamin Wood

Growing attention on the developing world’s potential for export led growth has naturally flowed into the agricultural sector. I examine the effects of Malawian crop adoption on childhood health to determine the effects of transitioning to cash crops in risky food markets. Preliminary results indicate that cash crop households had higher levels of childhood stunting, which may suggest providing...

Journal: :آب و خاک 0
هادی دهقان امین علیزاده سیدابوالقاسم حقایقی مقدم

abstarct precise knowledge of all components of water balance is essential to optimize water use in irrigated agriculture. however, water balance components are difficult to measure in required time intervals because their measuring is time consuming and costly. unsaturated zone simulator models are useful tools for predicting the effects of agricultural management on crop water use and can be ...

2005
R. Kancheva D. Borisova

In the contemporary world aerospace information gathered by different sensors and numerous observation missions has become a genuine necessity in various investigation and application fields. Remote sensing technologies are used for natural resources management, ecosystem change detection, environment preservation and in many other world significant problems. Vegetation monitoring is among the ...

Journal: :Journal of applied meteorology and climatology 2016
Michael J Glotter Elisabeth J Moyer Alex C Ruane Joshua W Elliott

Projections of future food production necessarily rely on models, which must themselves be validated through historical assessments comparing modeled to observed yields. Reliable historical validation requires both accurate agricultural models and accurate climate inputs. Problems with either may compromise the validation exercise. Previous studies have compared the effects of different climate...

2009
Shijuan Li Yeping Zhu

Crop simulation model has been becoming the core of agricultural production management and resource optimization management. Displaying crop growth process makes user observe the crop growth and development intuitionisticly. On the basis of understanding and grasping the occurrence condition, popularity season, key impact factors for main wheat diseases of stripe rust, leaf rust, stem rust, hea...

2009
Li Shijuan Zhu Yeping

Crop simulation model has been becoming the core of agricultural production management and resource optimization management. Displaying crop growth process makes user observe the crop growth and development intuitionisticly. On the basis of understanding and grasping the occurrence condition, popularity season, key impact factors for main wheat diseases of stripe rust, leaf rust, stem rust, hea...

2017
Andrej Ceglar Marco Turco Andrea Toreti Francisco J. Doblas-Reyes

Understanding the effects of climate variability and extremes on crop growth and development represents a necessary step to assess the resilience of agricultural systems to changing climate conditions. This study investigates the links between the large-scale atmospheric circulation and crop yields in Europe, providing the basis to develop seasonal crop yield forecasting and thus enabling a mor...

Journal: :international journal of agricultural science, research and technology in extension and education systems 2014
berihun kassa hailu

agricultural extension workers’ service has been placed as the central pattern of agricultural transformation in general and smallholder farmers in particular. due largely to this commensurately known trend, identifying factors that determine farmers’ access to extension workers’ service and the effect of the service on crop yield was found to be imperative. cross sectional data was collected t...

2005
G. S. McMaster J. C. Ascough D. A. Edmunds A. A. Andales L. Wagner F. Fox

Agricultural models and decision support systems are becoming increasingly available for a wide audience of users. The Great Plains Framework for Agricultural Resource Management (GPFARM) DSS is a strategic planning tool for farmers, ranchers, and agricultural consultants that incorporates a science simulation model with an economic analysis package and multi-criteria decision aid for evaluatin...

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