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. 58c, 282Ð287 (2003); received October 22, 2002 Activity of nitrification inhibitors to several typical ammonia-oxidizing bacteria isolated recently, i. e. Nitrosococcus, Nitrosolobus, Nitrosomonas, Nitrosospira and Nitrosovibrio spe- cies was assayed using 2-amino-4-methyl-6-trichloromethyl-1,3,5-triazine (MAST), 2-amino- 4-tribromomethyl-6-trichloromethyl-1,3,5-triazine (Br-MAST), 2-chloro-6-trichloromethyl- pyridine (nitrapyrin) and others, and compared to confirm the adequate control of ammonia- oxidizing bacteria by the inhibitors. The order of activity of the

Düngung. Gemüse 3: 14-16. [in German] Hähndel R., Zerulla W. 2001. Effects of ammonium-stabilized N-fertilizers on yield and quality of vegetables. Acta Hort. 563: 81-86. Hendrickson L.L., Keeney D.R., Walsh L.M., Liegel E.A. 1978. Evaluation of nitrapyrin as a means of improving N efficiency in irrigated sands. Agron. J. 70: 699-703. Hochmuth G.J. 2003. Progress in mineral nutrition and nutrient management for vegetable crops in the last 25 years. HortScience 38(5): 999-1003. Kołota E. 1982. [Nitrogen fertilization influence on yields and irrigation efficiency

-Botanik. Karl v. Frisch- Straße, 3550 Marburg) S. 157. A Silent Gene Allelic to Yeast Invertase Structural Gene SUC2 Can Be Activated by Mutation to Direct the Formation of a New Type of Invertase. (del Castillo Agudo, L. Zimmermann, F. K.; Dept. de Microbiologia, Facultat de Fermacia, Univ.. E-Valoncia) S.I65. Free and Integrated Plasmid DNA in Spiroplasmas. (Nur, l. et al.; SD: Razin, S.; Dept. of Membrane and Ultrastructure Research. The Hebrew Unh/.-Hadassah Medical School, Jerusalem, Israel 91010) S. 169. Effect of Copper on Inhibition by Nitrapyrin of Growth of

-pyrazole phosphate (DMPP). Nitrapyrin is less common than DCD or DMPP. A major drawback of NIs is that they are biodegradable and thus need to be reapplied in regular intervals. Additionally, their action is limited to the sites of nitrification, further adding to their cost ineffectiveness. However, N losses via nitrification are not only of agronomic value, but they also contribute to environmental pollution. The inhibition of N losses in form of N 2 O emissions as well as of NO 3 − leaching is influenced by several parameters, such as soil texture, temperature, and water

Diphenaniid ++ 1 -H-N34 Diphenylainine +-I-gN Dithianon Drazoxolon Endothal Ethiritnol — Ethofumesate -H- -H- 23 Fenarimol -H- + -H-EN4 Fenazaflor -H-E2 Fenfuram Flamprop—Isopropyl Flamprop—inethyl Fluotrimazol -H-EN34 Imazalil -H-N5 Iprodione -H-E -H-E -H-E -H- -H-E3 Isocarbamid Isomethiozin -H-gN Lenacil -H-N4 Metalaxyl -H-N -H- -H-N4 Metamitron -H-N45 Methazole Methfuroxam Metolachior -H-E34 Metribuzin -H- -H- 12 -H-S -H-gN Molinate -H- / 1 -H-gN Napropamid -H- -H-N34 Nitrapyrin -H-El Norfiurazon -H-E4 Nuarimol +E +E Oxadiazon -H-E2 -H- -H- 1 -H-EN3 Oxycarboxin