نتایج جستجو برای: crop management
تعداد نتایج: 907711 فیلتر نتایج به سال:
Accurate simulation of agricultural management effects on N loss in tile drainage is vitally important for understanding hypoxia in the Gulf of Mexico. An experimental study was initiated in 1978 at Nashua, Iowa of the USA to study long-term effects of tillage, crop rotation, and N management practices on subsurface drainage flow and associated N losses. The Root Zone Water Quality Model (RZWQM...
Agricultural systems pose many challenges and problems that can be formulated as optimization problems. Among these major challenges are crop selection and irrigation planning. That is, to decide on the proper set of crops to be cultivated and a proper irrigation scheme. Such decisions are made to achieve a certain objectives that typically include the maximization of net profit and/or the mini...
Living and dead plant vegetation on the surface of soils can provide opportunities for regulating pest populations in no-tillage production systems. Cover crops generate substantial quantities of surface vegetation and residue that can be managed to enhance control of pests. Research at the Beltsville Agricultural Research Center has shown that weed germination and emergence is inhibited by hig...
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...
Introduction: Precision or “site-specific” management of ag production requires application of fertilizer, pesticides, water and other inputs on spatial scales much smaller than previously used. The concept is simple; by using accurate navigation and positioning to guide collection, sensors for crop yield, soil properties and other conditions can be used to develop maps or databases of crop res...
There is compelling evidence that more diverse ecosystems deliver greater benefits to people, and these ecosystem services have become a key argument for biodiversity conservation. However, it is unclear how much biodiversity is needed to deliver ecosystem services in a cost-effective way. Here we show that, while the contribution of wild bees to crop production is significant, service delivery...
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...
Linking agricultural crop management and air quality models for regional to national-scale nitrogen assessments E. J. Cooter, J. O. Bash, V. Benson, and L. Ran United States Environmental Protection Agency, Office of Research and Development, National Exposure Research Lab, Research Triangle Park, North Carolina, USA Benson Consulting, Columbia, Missouri, USA University of North Carolina, Insti...
Over 175 growers in each of six states (Illinois, Indiana, Iowa, Mississippi, Nebraska, and North Carolina) were surveyed by telephone to assess their perceptions of the benefits of utilizing the glyphosate-resistant (GR) crop trait in corn, cotton, and soybean. The survey was also used to determine the weed management challenges growers were facing after using this trait for a minimum of 4 yr....
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