Irrigation with plant extracts in ecofarming increases biomass production and mineral and organic nitrogen content of plants     

Gerhard Gramss  Klaus‐Dieter Voigt  Hans Bergmann 《植物养料与土壤学杂志》2003,166(5):612-620

Seedlings of alfalfa, rape, spinach, and wheat, potted on sandy soil, were irrigated with an aqueous extract of pea shoot (PE, 9.84 g dry weight l^–1) or a solution of Ca, K, Mg, P, and NO₃‐N salts (SS) in a concentration similar to that in PE, for 31–48 days. In comparison to water‐irrigated controls, both SS and PE treated plants showed nearly equal increases in shoot dry weight (29–40 %), whereas PE‐treated plants had higher fresh weights (38–84 %) due to increased succulence. Treatment with SS did not enhance, but sometimes even reduce, the concentrations of Ca, K, Mg, and several trace elements in shoot tissues. In contrast, PE‐treated plants had higher Ca, K, Mg, and organic N, but lower As and Ni contents and were thus of higher nutritive value. Reduced contents of metals in plant tissue correlated with their reduced solubility in the soil solution, which was not due to changes in pH. Fertilizer components such as K and Mg (metals of lower exchange intensity) were incorporated into the soil to release Ca, Sr, and Ba (metals of higher exchange intensity) and reduce the solubility of most trace elements and metal‐complexing humic substances. In addition, application of Ca precipitated heavy metals and humic complexes directly from the soil solution. This effect was partially overcome by PE. Its carboxylic acids could act as phytochelators of metal ions and as mobilizers of the highly diffusible humic substances which carry metals to roots. It is concluded that continuous PE application replaces the quantities of Ca, K, Mg, P, and organic N, but not of NO₃‐N consumed during plant growth. Using PE does not add any relevant quantities of toxic metals to the plant‐soil system.  相似文献   

The synergism of Actinobacillus pleuropneumoniae and influenza A virus in experimentally-infected mice     

S Br?ring  E Müller  K Petzoldt  H A Schoon  K C Bergmann 《Zentralblatt für Veterin?rmedizin. Reihe B. Journal of veterinary medicine. Series B》1989,36(9):681-690

Models for infecting mice with Influenza A-Virus (A/PR 8/34, H0N1) and Actinobacillus pleuropneumoniae (serotype 9) were developed in Han: NMRI-mice. After infecting mice with sublethal doses of one of the infectious agents, or both together as a mixed infection, animals were subsequently exsanguinated and the lungs washed by bronchoalveolar lavage. Clinical symptoms were recorded daily, examination of lung lavage fluid and sera as well as histology of the lungs were done. An increase in mortality, weight reduction and total cell yield of lung lavage fluid was observed after mixed infection. Compared to mixed infections total protein content and elastase in sera and lung lavage fluid after singular ones were raised not as much. In lung lavage fluid the total cell yield was increased more marked. These alterations indicate a synergistic effect of viruses and bacteria, developed by mixed infection as well as a bacterial infection on top of a viral one. Histopathologically the lung alterations were found to depend on the infectious agent and the mode of infection.  相似文献   

Electron microscopy studies on the structure and configuration of a herpesvirus isolated from cattle     

H Granzow  H Bergmann  P Solisch  H Liebermann 《Archiv fuer experimentelle veterinaermedizin》1983,37(5):671-683

  相似文献   

Ultrastructure of capillaries in the skeletal muscles of pork pigs     

V Bergmann 《Archiv fuer experimentelle veterinaermedizin》1972,26(3):405-475

  相似文献   

Studies on the problem of activation of latent and inapparently developing salmonella infections by vaccination as well as on the possibility of simultaneously given vaccinations against salmonella infections and hog cholera     

E Wittmann  D Schmidt  H Bergmann 《Monatshefte für Veterin?rmedizin》1967,22(5):165-169

  相似文献   

Primary lesions in cardiac ganglia of the pig after herpesvirus suis infection   总被引：1，自引：0，他引：1  

C H Becker  V Bergmann 《American journal of veterinary research》1968,29(3):745-748

  相似文献   

The state of swine diseases in the years 1959 to 1964 according to section results     

V Bergmann 《Monatshefte für Veterin?rmedizin》1965,20(21):882-889

  相似文献   

Ultrastructure of mitochondria in the skeletal muscles of pigs. A contribution to the pathogenesis of pale, soft, exudative meat     

V Bergmann 《Archiv fuer experimentelle veterinaermedizin》1974,28(3):225-241

  相似文献   

On the effect of 19-nortestosterone-17 beta-cyclohexylpropionate in cattle     

W St?ckl  H Bergmann  G Rainer 《Wiener tier?rztliche Monatsschrift》1967,54(9):584-590

  相似文献   

On the chemotherapy of leukosis in cattle with soluble Bayer E 39 and Trimitan     

W Verter  E Büchner  W Bergmann 《Archiv fuer experimentelle veterinaermedizin》1966,20(3):464-476

  相似文献