The use of remote imagery captured by unmanned aerial vehicles (UAV) has tremendous potential for designing detailed site-specific weed control treatments in early post-emergence, which have not possible previously with conventional airborne or satellite images. A robust and entirely automatic object-based image analysis (OBIA) procedure was developed on a series of UAV images using a six-band ...

Various mutations altering the herbicide target site (TS), can lead to structural modifications that decrease binding efficiency and results in herbicide resistant weed. In most cases, such a mutation will be associated with ecological fitness penalty under herbicide free environmental conditions. Here we describe the effect of various mutations, endowing resistance to acetyl-CoA carboxylase (A...

(1) Background: Weed control decreases the competition for nutrients, but also potential of increased phosphorus (P) mobilization in soils caused by higher plant diversity. (2) Methods: Impacts weed species under maize on mycorrhizal colonization and plant-availability P were investigated two pot experiments. Plant traits tested weed-free mixed growth with six annual species. (3) Results: Growt...

The success of precision agriculture relies largely on our ability to identify how the plants’ growth limiting factors vary in time and space. In the field, several stress factors may occur simultaneously, and it is thus crucial to be able to identify the key limitation, in order to decide upon the correct contra-action, e.g., herbicide application. We performed a pot experiment, in which sprin...

Reducing herbicide use may result in residual weed flora arable fields, increasing crop–weed competition for resources. In temperate cropping systems, light and nitrogen are the main resources which plants compete. As increases, soil mineral might become less abundant as of fertiliser is reduced environmental reasons (pollutions biodiversity loss). Better understanding crops weeds competitive a...

This study discusses the methodical problems which occur during the process of generating weed distribution maps in geoinformation systems (GIS). Particular attention will be paid to the question of whether or not the weed sampling data and the weed distribution maps for site-specific weed control are sufficiently representative. Manual or image-processing sampling procedures are applied in ord...

Site-specific weed management requires sensing of the actual weed infestation levels in agricultural fields to adapt the management accordingly. However, sophisticated sensor systems are not yet in wider practical use, since they are not easily available for the farmers and their handling as well as the management practice requires additional efforts. A new sensor-based weed detection method is...

The effects of routine and luxury weed control and fertilization treatments on diameter, height, carbon (δC) and nitrogen (δN) isotope composition in foliage were assessed in an 8-year-old, F1 hybrid pine (Pinus elliottii var. elliottii Pinus caribaea var. hondurensis) plantation, on typical sandy soils in southeast Queensland. The aim of this research was to identify how weed control and ferti...

Understanding the spectral characteristics of crops in response to stress caused by weeds is a basic step improving precision agricultural technologies that manage field. This research focused on competition between corn (Zea mays) and redroot pigweed (Amaranthus retroflexus), common weed strongly reduces yield. The aim this was characterize physiological changes occur during early growth becau...

Root discrimination of species is a pre-condition for studying belowground competition processes between crop and weed species. In this experiment, we tested Fourier transform mid-infrared (FT MIR)-attenuated total reflection (ATR) spectroscopy to discriminate roots of closely related crop and weed species grown in the greenhouse: maize/barnyard grass, barley/wild oat, wheat/blackgrass (Poaceae...