Dicamba resistance in kochia from Kansas and Nebraska evolved independently     

Junjun Ou  Todd A Gaines  Allan K Fritz  Phillip W Stahlman  Mithila Jugulam 《Pest management science》2021,77(1):126-130

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Rasse oder Standortsform     

Fritz Lautenbach 《Forstwissenschaftliches Centralblatt》1933,55(23):813-831

Ohne Zusammenfassung  相似文献   

Die formzahl der fichte in ihrer Ubh?ngigkeit vom Schlutzgrad und Bestandesaufbau     

Fritz Ernst 《Forstwissenschaftliches Centralblatt》1934,56(13):448-460

Ohne Zusammenfassung  相似文献   

    

Fritz Backmund 《Forstwissenschaftliches Centralblatt》1934,56(4):105-121

Ohne Zusammenfassung  相似文献   

Untersuchungen Zur N‐Dynamik In Stillgelegten Ackerböden     

Fritz Asmus 《Archives of Agronomy and Soil Science》2013,59(6):441-447

In einem Dauerversuch auf Tieflehm‐Fahlerde/Sandlehm‐Parabraunerde und einem Lysimeterversuch mit Sand‐Rosterde wird der Einfluß verschiedener Formen der Flächenstillegung auf die N‐Dynamik im Boden untersucht. Auf der Schwarzbrache wurden die höchsten Gehalte an N_min (NO₃‐ und NH₄‐N) gefunden. Jede Begrünung der Dauerbrache führte infolge des N‐Entzuges durch die Pflanzen zu einer Reduzierung der N‐Gehalte. Unter Schwarzbrache traten die höchsten Sickerwassermengen (40,5% der Jahresniederschlagsmenge) und die höchsten N‐Austräge (103,5 kg/ha. a) auf. Unter begrünter Brache betrug die Sickerwassermenge nur 15,6% der Jahresniederschlagsmenge, die N‐Auswaschung nur 6,4 kg/ha.a  相似文献   

Rasse oder Standortsform     

Fritz Lautenbach 《European Journal of Forest Research》1933,55(24):860-866

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Der Einßuß der Bodenbearbeitung und Düngung auf den Wasserhaushalt und die Durchwurzelung sandiger Waldböden Brandenburgs     

Fritz Buchholz  Eckhard Neumann 《Archives of Agronomy and Soil Science》2013,59(6-7):525-536

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Fascioloides magna infection causing fatal pulmonary hemorrhage in a steer     

Bruce K. Wobeser  Fritz Schumann 《The Canadian veterinary journal. La revue veterinaire canadienne》2014,55(11):1093-1095

A feedlot steer died suddenly without exhibiting signs of clinical illness. Cysts containing Fascioloides magna were found in the liver and lung. Fatal pulmonary hemorrhage was associated with these flukes. Neither death nor clinical pulmonary disease has been previously attributed to infections of adult cattle by F. magna.  相似文献   

The effect of very low food intake on digestive physiology and forage digestibility in horses     

M. Clauss  K. Schiele  S. Ortmann  J. Fritz  D. Codron  J. Hummel  E. Kienzle 《Journal of animal physiology and animal nutrition》2014,98(1):107-118

Equid digestion is often conceptualized as a high‐throughput/low‐efficiency system, in particular compared with ruminants. It is commonly assumed that ruminants have an advantage when resources are limited; the effect of low food intake on digestive physiology of horses has, however, not been explored to our knowledge. We used four adult ponies [initial body mass (BM) 288 ± 65 kg] in two subsequent trials with grass hay‐only diets [in dry matter (DM): hay1, mid‐early cut, crude protein (CP) 10.5%, neutral detergent fibre (NDF) 67.6%; hay2, late cut, CP 5.8%, NDF 69.5%], each fed subsequently at four different dry matter intake (DMI) levels: ad libitum and at 75, 55 and 30 g/kg^0.75/day. We particularly expected digesta mean retention times (MRT) to increase, and hence fibre digestibility to increase, with decreasing DMI. Ponies maintained BM on the first, but lost BM and body condition on DMI55 and DMI30. MRTs were negatively correlated to DMI and ranged (for particles <2 mm) from 23/31 h (hay1/2) on the ad libitum to 38/48 h on DMI30. Digestibilities of DM, nutrients and fibre components decreased from DMI75 to DMI30; apparent digestibilities of organic matter and NDF (hay1/2) dropped from 47/43% and 42/37%, respectively, on the ad libitum DMI to 35/35% and 30/28% on DMI30. Additional differences evident between the two hays included a higher estimated ‘true’ protein digestibility for hay1 and finer faecal particles on hay2; there were no differences in faecal particle size between intake levels. The results suggest that below a certain food intake threshold, the major digestive constraint is not fermentation time but nutrient supply to gut bacteria. The threshold for such an effect probably varies between feeds and might differ between ruminants and equids.  相似文献   

Soil type and land use intensity determine the composition of arbuscular mycorrhizal fungal communities   总被引：3，自引：0，他引：3  

Fritz Oehl  Endre Laczko  Karl Stahr  Marcel van der Heijden 《Soil biology & biochemistry》2010,42(5):724-738

The objective of this study was to test whether soil types can be characterized by their arbuscular mycorrhizal fungal (AMF) communities. To answer this question, a well-defined study area in the temperate climatic zone of Central Europe was chosen with a large spectrum of soils and parent materials. Representative soil samples were taken from three soil types (Cambisol, Fluvisol and Leptosol) at in total 16 sites differing in agricultural land use intensity (9 grasslands and 7 arable lands). AMF spores were isolated and morphologically identified directly from field soils and after reproduction in trap cultures. AMF diversity and community composition strongly depended on soil type and land use intensity, and several AMF species were characteristic for a specific soil type or a specific land use type and hence had a specific niche. In contrast, other AM fungi could be considered as ‘generalists’ as they were present in each soil type investigated, irrespective of land use intensity. An estimated 53% of the 61 observed AMF species could be classified as ‘specialists’ as (almost) exclusively found in specific soil types and/or under specific land use intensities; 28% appeared to be ‘generalists’ and 19% could not be classified. Plant species compositions (either natural or planted) had only a subordinate influence on the AMF communities. In conclusion, land use intensity and soil type strongly affected AMF community composition as well as the presence and prevalence of many AM fungi. Future work should examine how the differences in AMF species compositions affect important ecosystem processes in different soils and to which extent the loss of specific groups of AM fungi affect soil quality.  相似文献