Mixtures of modern and historical wheat cultivars under organic management in western Canada

Two historic (Red Fife and Marquis) and two modern (5602HR; AC Barrie) wheat (Triticum aestivum) cultivars were assessed to determine if cultivar mixtures provided a benefit to grain yield and disease and weed suppression in Manitoba over 3 site-years. 5602HR was the highest yielding sole cultivar while Marquis and AC Barrie were the lowest yielding sole cultivars. Red Fife yielded similar to 5602HR in several cases. Orthogonal contrasts across all site-years showed that 3 and 4 cultivar mixtures yielded similar (P>0.05) to 5602HR, the highest yielding monocrop

Az épített örökség hozzáférhetővé tétele és a műemléki topográfia

A tanulmány amellett érvel, hogy eredményes város- és településfej - lesztés, csak úgy képzelhető el, ha azt a mai szükségletek felmérésén túl az épített és természeti környezet komplex ismeretére alapozzák. A legtöbb nyugat-európai országban a hosszú távú és folyamatos műem - léki topográfiai kutatómunka biztosítja az ehhez szükséges tudás és is - meretek szilárd alapját. A magyar műemlékvédelem másfél százados története során szintén voltak figyelemre méltó erőfeszítések annak érdekében, hogy az ország műemlékeinek, illetve tágabban műemléki értékeinek kor-szerű és többé-kevésbé naprakész kataszterét megal - kossák, de ezzel a szükséges szakmai mélységben sohasem sikerült a teljes ország teljes területét lefedni és az 1950 és az 1980-as évek vége közötti periódustól eltekintve, a vállalkozás mindig csak részlegesen, gyakori megszakításokkal és hosszú szünetekkel valósulhatott meg. Az 1990-ben bekövetkezett politikai rendszerváltozás után minden szakmai érv amellett szólt, hogy újrainduljon a magyarországi műem - léki értékállomány rend-szerelvű számbavétele. A magyar épített ö - rökség jellegzetességei alapján a topográfiai számbavétel szempont - jából szóba jövő objektumok száma jelenleg 300 000-re becsülhető. Ezt a célt szem előtt tartva a tanulmány tömör, átfogó képet ad Németország, Ausztria, Svájc, Franciaország és érintőlegesen Anglia példáján a műemléki inventarizáció, illetve topográfia európai, első - sorban kontinentális fejlődéséről, aláhúzva a műemléki topográfia és a műemlékvédelem elméleti és gyakorlati kihívásai közti szoros össze - függést és a társadalmi háttér jelentőségét

GRAZING GREEN MANURES TO OPTIMIZE NITROGEN SUPPLY ON THE CANADIAN PRAIRIES

Grazing green manures may improve N availability and productivity in integrated crop-livestock systems. We hypothesized that grazing green manures, compared with standard soil incorporation with tillage, would increase autumn soil profile NO3-N concentrations. Experiments were carried out for three years between 2009 and 2011 in Manitoba, Canada. Seven different green manure crops or mixtures were grazed with sheep or left ungrazed. Hairy vetch, pea/oat mix and oats produced the greatest forage biomass in two out of three years. In 2010, sweet clover produced a similar amount (5813 kg ha-1). Soybean and lentil failed to compete with weeds; containing 30 to 73% weed biomass in all years. Utilization by sheep for all crops ranged from 28% to 86% but the most common range was between 60% and 80%. Soil NO3-N to 120 cm was significantly greater in grazed than in ungrazed plots. Greatest soil NO3-N content (226 kg ha-1) was observed in grazed pea/oat plots in experiment 1 and lowest (44 kg ha-1) was in ungrazed mixture plots in experiment 3. In experiment 1, total profile soil NO3-N level in pea/oat plots was greater than in oat plots. In experiment 2, oat plots contained less NO3-N than pea/oat and mixture plots. In experiment 3, there was significant species and management effect where soil in grazed hairy vetch plots contained the greatest amount of NO3-N. This interaction indicated that increase in soil NO3-N availability is greater when hairy vetch is grazed than grazing of other crops. In situations with low legume biomass productivity, grazing may be used to increase the N benefit from legume green manures to the following crops. Therefore, in addition to single benefit of soil fertility, two benefits were reaped from green manures; potential livestock live weight gain and soil fertility

Assessment of selected soil parameters in a long-term Western Canadian organic field experiment

A long-term field study was used to compare soil nitrogen and phosphorous status, and soil aggregate stability in organic and conventional cropping systems. Two rotations were tested: a grain only and a grain-alfalfa hay rotation. The organic systems had a lower nitrate leaching potential than the same rotations under conventional management. After 13 years, one organic system (the grain-alfalfa; no manure return) is suffering serious soil P depletion. However, the grain only and the grain-alfalfa with manure return to land systems had soil P levels similar to the prairie grass control treatment and showed no signs of P deficiency. Despite having lower levels of organic carbon, the organic soils had higher levels of wet aggregate stability than conventionally managed soils

Preliminary control law and hardware designs for a ride quality augmentation system for commuter aircraft. Phase 2

The continued investigation of the design of Ride Quality Augmentation Systems (RQAS) for commuter aircraft is described. The purpose of these RQAS is the reduction of the vertical and lateral acceleration response of the aircraft due to atmospheric turbulence by the application of active control. The current investigations include the refinement of the sample data feedback control laws based on the control-rate-weighting and output-weighting optimal control design techniqes. These control designs were evaluated using aircraft time simulations driven by Dryden spectra turbulence. Fixed gain controllers were tested throughout the aircrft operating envelope. The preliminary design of the hardware modifications necessary to implement and test the RQAS on a commuter aircraft is included. These include a separate surface elevator and the flap modifications to provide both direct lift and roll control. A preliminary failure mode investigation was made for the proposed configuration. The results indicate that vertical acceleration reductions of 45% and lateral reductions of more than 50% are possible. A fixed gain controller appears to be feasible with only minor response degradation

Akut cardiovascularis kórképek vizsgálata különböző légköri paraméterek tükrében

Introduction: Research on the effects of meteorological parameters on cardiovascular diseases may allow the development of novel prevention strategies. Aim: The aim of the authors was to examine the correlation between meteorological parameters and the occurrence of acute cardiovascular diseases. Method: A retrospective analysis was performed in 343 patients diagnosed with acute cardiovascular disease and treated at the Department of Vascular Surgery, Semmelweis University in 2010. Results: Acute cardiovascular diseases showed a seasonal variation with the highest occurrence in winter months (p = 0.0001). The daily increase of the events (n ≥ 3) were associated with front movements days (in 62.5% of cases). A significant correlation was found between the intraday temperature difference (p<0.0001), the intraday atmospheric pressure difference (p = 0.0034), the lowest maximum daily temperature (p<0.0001) and the occurrence of acute cardiovascular diseases. During the days with front movements 64% of the patients were older than 66 years of age. Among risk factors, hypertension showed front sensitivity. Conclusions: Meteorological parameters are minor risk factors in the occurrence of acute cardiovascular diseases