The Infona portal uses cookies, i.e. strings of text saved by a browser on the user's device. The portal can access those files and use them to remember the user's data, such as their chosen settings (screen view, interface language, etc.), or their login data. By using the Infona portal the user accepts automatic saving and using this information for portal operation purposes. More information on the subject can be found in the Privacy Policy and Terms of Service. By closing this window the user confirms that they have read the information on cookie usage, and they accept the privacy policy and the way cookies are used by the portal. You can change the cookie settings in your browser.
Plasticulture development contributes largely to the local environment stress [1-3]. Therefore, accurate information about plasticulture area and development is of great importance for better monitoring and planning of their uses, thus alleviating the adverse environmental impacts, however, it has not drawn enough attention. In this study, we reconstructed the spatial and temporal patterns of plasticulture...
To improve the performance of crop models for regional crop yield estimates, a particle filter (PF) was introduced to develop a data assimilation strategy using the Crop Environment Resource Synthesis (CERES)—Wheat model. Two experiments involving winter wheat yield estimations were conducted at a field plot and on a regional scale to test the feasibility of the PF-based data assimilation strategy...
Vertical distribution of diverse available heavy metal elements in vegertable soil profile ( 0 ~ 2m ) was studied with different extractants. The results indicated that the content of available heavy metal in soil decreased with the increase the depth. This regularity adequately showed that the external factors were the important resources of available heavy metal, for example the atmospheric deposition,...
In order to investigate the content of groundwater NO3 -- N in Hebei Province. [Methods] In 2011,500 groundwater samples were collected from 11 cities of Hebei Province before and after the rainy season, the contents of groundwater NO3 -- N was analyzed with ultraviolet and visible spectrophotometer. [Results] The groundwater NO3 -- N contents of Hebei Province changed from 0.01mg/L to 350.86 mg/L,...
The measurement method of irregular field area is studied in this paper. A multifunctional measuring instrument of farmland area is developed by using GPS model. The instrument mainly consists of a GPS module, a micro-controller, keyboards, a LCD and a micro-printer. It can measure the area of irregular field rapidly, set the unit price charge of agriculture mechanical operation and calculate the...
According to the actual situation of combine harvester workload, a load feedback controller based on theory of fuzzy control is designed by means of detecting the information such as threshing cylinder speed, crop screw conveyor speed, feed-in quantity, loss rate which can reflect the workload of combine harvester and researching on multi-signal fusion method. It can auto-control the forward speed...
Set the date range to filter the displayed results. You can set a starting date, ending date or both. You can enter the dates manually or choose them from the calendar.