Weeds, plants that thrive in the face of disturbance, have eluded human's attempts at control for >12 000 years, positioning them as a unique group extreme stress tolerators. The most successful weeds suite traits enable to rapidly adapt environments typified by stress, growing hostile conditions or subject massive destruction from agricultural practices. Through their ability persist and adapt...

Soil-cutting forces are key indicators of root-tuber harvesters and other soil-engaging tools’ performance. To improve operational efficiency, minimise soil disturbance, reduce fuel consumption, the draught vertical involved in root tuber crop harvesting must be minimised. Two field experiments assessed harvester’s performance at a depth 200 mm, varying frequencies, travel speeds on clay sandy ...

Crop model simulates growth and yield of crop in field scale and can be used to provide useful field information for farmers, such as irrigation application dates and amount, fertilizer application dates and amount, the choose of crop variety. Researchers have used crop models for many years, but they have had limited success in packaging these complex models in a framework that make them easy ...

The problem of disturbance rejection in the control of nonlinear systems with additive disturbance generated by some unforced nonlinear systems, was formulated and solved by {itshape Mukhopadhyay} and {itshape Narendra}, they applied the idea of increasing the order of the system, using neural networks the model of multilayer perceptron on several systems of varying complexity, so the objective...

disturbances in fibromyalgia syndrome: relationship to pain and depression. Sleep disturbance is a widely reported and debilitating concomitant of fibromyalgia syndrome (FMS) and plays a pivotal role in exacerbating patients reporting of symptoms. Bigatti and colleagues report a longitudinal study that examined self-reported sleep, pain, depression and physical functioning at baseline in FMS pa...

Although a many studies concerning crop residue burning have been conducted, the influence of crop residue burning on local PM2.5 concentrations remains unclear. The number of crop residue burning spots was the highest in Heilongjiang province and we extracted crop residue burning spots for this region using MOD14A1 (Thermal Anomalies & Fire Daily L3 Global 1 km) data and national land cover da...

Weed control through crop rotation has mainly been studied in a nonspatial context. However, weed seeds are often spread beyond the crop field by a variety of vectors. For weed control to be successful, weed management should thus be evaluated at the landscape level. In this paper we assess how seed dispersal affects the interactions between crop rotation and landscape heterogeneity schemes wit...

The sequence in which disturbance events occur has the potential to affect the structure of ecological communities, but its role has been generally overlooked. Most disturbance studies have focused on the frequency or intensity of disturbance, probably reflecting the influence of the intermediate disturbance hypothesis. To investigate the effects of disturbance sequence on community structure, ...

The lead review “Risk assessment of genetically modified crops for nutrition and health” by Magaña-Gómez and Calderon de la Barca,1 ends with a common plea: “more research is needed”. It is valid to put both this plea and the justification for other similar research into perspective. How selective are the reviews that lead to the conclusion that more of such research is needed?What comparators ...