Effect of straw and nitrogen on common root rot

Non-Peer Reviewe

Incidence of CochlioboLus sativus in Queensland wheat crops

Environmental and soil conditions in Queensland are widely different from those in Saskatchewan, Canada, yet Cochliobolus sativus (Ito & Kuribay.) Drechsl. ex Dast., the dominant fungus pathogen responsible for common root rot of wheat in Saskatchewan, is also a component of the root and crown rot complex in Queensland

Pythium root rot of wheat in Queensland soil

Oospores similar in appearance to those found in roots of browning root rot infected plants in Western Canada were commonly found in wheat roots on the Darling Downs of Queensland. The crops, when observed, were past the stage when field symptoms of the disease are readily apparent. However, relatively low numbers of oospores and absence of extensive root lesions indicated that injury may have been minimal. It should be realized that browning root rot rarely kills the wheat seedlings or young plants; nevertheless, the partial destruction of the root system often leads to a yield reduction of 3-10 bus/ac

A vision for laser induced particle acceleration and applications

High intensity lasers interacting with solid and gas targets can produce energetic beams of electrons, protons, heavy ions, photons and neutrons. There is the potential for producing "table top" sources of radiation for many different applications

Low-and medium-mass ion acceleration driven by petawatt laser plasma interactions

An experimental investigation of low- and medium-mass ion acceleration from resistively heated thin foil targets, irradiated by picosecond laser pulses at intensities up to 5 × 1020 W cm−2, is reported. It is found that the spectral distributions of ions, up to multi-MeV/nucleon energies, accelerated from the rear surface of the target are broadly consistent with previously reported measurements made at intensities up to 5 × 1019 W cm−2. Properties of the backward-directed beams of ions accelerated from the target front surface are also measured, and it is found that, compared with the rear surface, higher ion numbers and charges, and similar ion energies are produced. Additionally, the scaling of the maximum ion energy as a function of ion charge and laser intensity are measured and compared with the predictions of a numerical model

Lateral electron transport in high-intensity laser-irradiated foils diagnosed by ion emission

An experimental investigation of lateral electron transport in thin metallic foil targets irradiated by ultraintense (>= 10(19) W/cm(2)) laser pulses is reported. Two-dimensional spatially resolved ion emission measurements are used to quantify electric-field generation resulting from electron transport. The measurement of large electric fields (similar to 0.1 TV/m) millimeters from the laser focus reveals that lateral energy transport continues long after the laser pulse has decayed. Numerical simulations confirm a very strong enhancement of electron density and electric field at the edges of the target