Influence of Timing of Herbicide Application on Winter Canola Performance
Canola (Brassica napus L.) is an important source of vegetable oil for humans and canola cake is a nutritious feed for animals. However, weeds are one of the major constraints in canola production in the southeastern regions of the United States causing loss upto 50 percent in yield. Control of weeds in spring canola has been reported but research on weed control in winter canola has not been well documented. Therefore, research experiments were conducted from 2005 to 2007 to evaluate the effects of herbicide application timings on canola performance. Results showed that pre-emergence timing of trifluralin @ 1 kg ai ha resulted 496 kg ha , 411 kg ha , 502 kg ha higher canola yield as compared to control in 2005, 1 1 1 1 2006 and 2007, respectively. Pre-emergence application timing of trifluralin gave 79% less weed biomass than control plots. Increasing weed density and weed biomass significantly reduced the canola yield whereas increasing plant height increased the canola yield significantly. This study revealed that herbicide application timing significantly reduced weed biomass and increased canola yield.
Integrated Weed Management in Indian Mustard
One hand weeding supplemented with thiozypyr at 120 or 150 g ha−1 being statistically at par with two hand weedings (20 and 40 DAS) reduced the dry weight of weeds to the extent of 90% and resulted in seed yield of mustard statistically equivalent to weed-free plots. Chlorimuron caused 92–98% crop injury. Weeds growing throughout the crop season resulted in 24.7% reduction in seed yield of mustard.
Geomagnetic micropulsations due to the motion of ocean waves
When sea waves move in the magnetic field of the earth, electric currents are generated in the water volume. These currents give rise to a small magnetic field which perturbs the earth's field. For plane trochoidal waves, this perturbing field decays exponentially with altitude and lies in a vertical plane which is oriented in the direction of wave propagation. The magnitude of the perturbing field also depends upon the magnitude and dip angle of the earth's field, and upon the height, wavelength, and propagation direction of the sea waves. For north-south waves, sea state 5, and an altitude of 100 feet, the perturbation is of the order of 0.1 gamma.