During the spring and summer of 1986, I studied the distribution and breeding biology of five rare birds in the Oklahoma Panhandle: Ferruginous Hawk (Hrrtcv regalis), Golden Engle (Aquiln cht-pctos), Prairie Falcon (Fnlco incsicn~rzrs), Mountain Plover (Clmradrirrs nzontnirrrs) and Long-billed Curlew (N~rinriiirrs ainrricn~iris). Longbilled Curlewsare regular migrants through the western half o...

BACKGROUND AND AIMS The regrowth dynamics after defoliation of the invasive grass Calamagrostis epigejos were studied. As nitrogen (N) reserves have been shown to play an important role during plant regrowth, the identity, location and relative importance for regrowth of N stores were determined in this rhizomatous grass. METHODS Plant growth, nitrate uptake and root respiration were followed...

The principal spring staging areas of the midcontinent population of sandhill cranes (Grus canadensis) are along the Platte and North Platte rivers in south-central Nebraska. Most of these lands are privately owned and managed for corn and cattle production. Diurnal habitat use by radio-tagged cranes was primarily in cropland (55%), native grassland (28%), and tame hayland (15%). Ninety-nine pe...

The reduction in the manure application rates through enrichment with mineral fertilizer has potential to reduce costs, decrease environmental pollution, and extend benefits greater acreage. A pot experiment was carried out assess ammonia emissions from dairy amended fertilizers applied on wheat stubble. treatments were: control (no fertilization), urea (U), calcium ammonium nitrate (AN), (MAN)...

Abstract Cereal production in Australia is severely impacted by diseases such as Fusarium crown rot (caused predominantly pseudograminearum ) and common root Bipolaris sorokiniana ). These are particularly difficult to manage because inoculum can survive at least three years within cereal stubble, or four soil the case of B. . Microwave radiation may be able reduce eliminate stubble soil. Sever...

Fall is burning season in the wheat fields of eastern Washington State. To prepare for planting in 1998, farmers burned about 229,000 acres of wheat stubble, an increase over recent years. Although a tighter state permitting system substantially reduced the acreage burned in 1999, dean air activitists are concerned that the state has not tightened up enough. The fires are used to help control c...

Fall is burning season in the wheat fields of eastern Washington State. To prepare for planting in 1998, farmers burned about 229,000 acres of wheat stubble, an increase over recent years. Although a tighter state permitting system substantially reduced the acreage burned in 1999, dean air activitists are concerned that the state has not tightened up enough. The fires are used to help control c...

s: 49th Ann. Meet. Soc. Range Manage. Wichita, Kan. Risser, P.G. 1995. The status of the science examining ecotones. BioSci. 45:318–325. Roath, L.R. and W.C. Krueger. 1982a. Cattle grazing influence on a mountain riparian zone. J. Range Manage. 35:100–103. Roath, L.R. and W.C. Krueger. 1982b. Cattle grazing and behavior on a forested range. J. Range Manage. 35:332–338. Rosgen, D. 1996. Applied ...

The process of agricultural development which takes place in Argentina has led to the loss sustainability. Mixed systems could be an alternative for improving productivity and, at same time, taking into account environmental cost. sowing sunflower (Helianthus annus L.) consociated with other species can generate greater biomass some cases, yield. Such practice is about differential harnessing r...