Simplified N fertilization strategies for winter wheat. Part 1: plants: compensation capacity of modern wheat varieties     

Thomas Makary  Rudolf Schulz  Torsten Müller  Carola Pekrun 《Archives of Agronomy and Soil Science》2020,66(6):847-857

ABSTRACT

Winter wheat in northwestern Europe is often fertilized with several doses of calcium-ammonium-nitrate (CAN). For economy, farmers fertilize using a combination of N-doses. Here, we examined the necessity of N splitting (1–3) and application timing in experiments conducted in 2010 using a one-factorial fully randomized block design, and in 2011–2012 using a two-factorial split-plot design (four replicates). The study site, in southwestern Germany, had silty loam soil, and modern cultivars (2010: one cultivar, 2011–2012: three cultivars) with different genetic abilities to develop the yield components of interest were tested. A late first or single N application at stage BBCH 29/31 did not lead to differences in grain yields or protein contents compared to three N applications. However, a single N application at stage BBCH 25/27 resulted in a reduced protein content. Yield component development did not significantly differ among the cultivars. Early N application increased plant density but not yield. In two years, low plant densities were compensated by higher numbers of kernels per spike. Hence, under the tested conditions, the number of N applications could be reduced, as the high compensation ability of modern cultivars allows N fertilization consisting of two or even one application.  相似文献   

Laparoskopische Untersuchungen zum Tertiärfollikelwachstum im Brunstzyklus beim Merinofleischschaf     

Karl-Heinz Kaulfuß  reas Richter  Joachim Schulz 《Reproduction in domestic animals》1994,29(1):22-37

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Xenon: effect on radiation sensitivity of HeLa cells     

R J Schulz  A M Markoe  R Anigstein 《Science (New York, N.Y.)》1969,163(867):571-572

HeLa cells, plated onto plastic petri dishes, were exposed to various atmospheres composed of air and carbon dioxide; helium, oxygen, and carbon dioxide; and xenon, oxygen, and carbon dioxide in a pressure vessel. Survival curves with x-rays, 280 kilovolts (peak), show that air and helium have the same effect, but that xenon potentiates x-irradiation to the extent that the dose to produce a given level of survival with xenon is 0.58 of the dose required with air.  相似文献   

Microbiological studies of food samples of collective feeding     

C Schulz 《Monatshefte für Veterin?rmedizin》1967,22(16):671-674

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Behavior and correlation between electric conductivity and other diagnostic criteria of subclinical mastitis as a function of the lactation phase in the cow     

H Mielke  J Schulz 《Archiv fuer experimentelle veterinaermedizin》1983,37(4):629-640

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Ileal digestibility of amino acids in pigs fed barleys differing in protein content     

L Buraczewska  E Schulz  H Schr?der 《Archives of Animal Nutrition》1987,37(10):861-867

The apparent digestibility of nitrogen and amino acids was measured by the ileal and faecal methods in pigs fed nine barleys differing in nitrogen content (from 1.73 to 2.16 per cent/DM). A positive (r = 0.87) and significant relationship was found between the apparent nitrogen digestibility at the end of the ileum and the crude protein content of barley. Generally, the higher the protein of the grain, the higher the ileal digestibilities of the amino acids. For most amino acids the faecal values were greater than the ileal ones. This being specially so for threonine, tryptophan, histidine and cystine belonging to the nutritionally important amino acid group. When the relationship between the amino acid and nitrogen digestibilities at the level of ileum is considered, the values were found to be similar to that of nitrogen in the case of tryptophan, higher for isoleucine, valine (both 2-3 units), cystine, histidine, leucine, methionine (all 5-6 units) and phenylalanine (10 units) and lower only for lysine and threonine (7-8 dig. units).  相似文献   

Experimentally induced infectious bovine keratoconjunctivitis: resistance of vaccinated cattle to homologous and heterologous strains of Moraxella bovis.     

G W Pugh  D E Hughes  V D Schulz  C K Graham 《American journal of veterinary research》1976,37(1):57-60

In studies to determine whether vaccination with one strain of Moraxella bovis would protect against challenge with virulent homologous or heterologous strains, calves were intramuscularly inoculated 3 times with formalin-killed M bovis, with 14 days between inoculations. Fourteen days after the 3rd vaccinal dose was given, all calves were exposed to homologous or heterologous virulent cultures of M bovis. The results indicated that vaccination with one strain of M bovis may induce protective immunity against homologous and heterologous challenge exposure; however, because vaccinated cattle resisted infection and disease produced by a homologous strain to a greater extent than they resisted those produced by heterologous strains, polyvalent vaccines or highly immunogenic common antigens may be needed to protect cattle against the numerous strains they might encounter under natural field conditions. There was minimal correlation between the presence of precipitating antibodies against the heterologous strains and the establishment of infection and disease.  相似文献   

The pathogenetic significance of Erysipelothrix rhusiopathiae in the acute and chronic form of erysipeloid arthritis]     

L C Schulz  W Drommer  H Ehard  B Hertrampf  W Leibold  C Messow  J Mumme  G Trautwein  S Uebersch?r  R Weiss  J Winkelmann 《DTW. Deutsche tier?rztliche Wochenschrift》1977,84(3):107-111

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Studies into demodicosis in cattle stocks     

W Schulz  G Gr?fner  T Hiepe 《Monatshefte für Veterin?rmedizin》1968,23(14):535-540

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Personal hygiene in laboratory animal breeding and husbandry of the pharmaceutical industry     

W Wilk  K R Appel  K D Schulz 《Berliner und Münchener tier?rztliche Wochenschrift》1971,84(23):449-451

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