Vergleichende Bewertung von Produkten der Guelleaufbereitung hinsichtlich ihres oekologisch unbedenklichen Einsatzes in der Pflanzenproduktion Abschlussbericht

SIGLEAvailable from TIB Hannover: F97B1067+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Experimentaluntersuchungen zur Vermeidung des Nitrataustrages in das Grundwasser unter semiariden Verhaeltnissen durch Anbau von Pflanzen mit hoher N-Akkumulation Abschlussbericht

In dependence of nitrogen fertilisation, nitrogen supply in the soil, weather conditions and growth of cereals exist after yielding of cereals different amounts of nitrogen. High nitrogen fertilisation in the spring is connected with nitrogen losses. Water content of soil diminished during vegetation under semiaride climate. With mathematical equations is possible to estimate water and nitrogen contents in the soil. They are the basis for decision for cultivation of crops after cereal for temporary fixing of nitrogen. Cultivation of crops after cereals is useful, when the amount of nitrogen in the soil is higher than 100 kg N/ha. After yield of cereals are required 50 1/m"2 water content in the soil and 80 1/m"2 precipitation in the autumn for cultivation of crops. Under favourable growth conditions in the autumn amount of nitrogen in the soil will be reduced to 50-60 kg N/ha. This nitrogen, fixed in the biomass, is available in the next year. (orig.)SIGLEAvailable from TIB Hannover: F96B198+a / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman

Untersuchung der Auswirkungen erhoehter atmosphaerischer CO_2-Konzentrationen auf Weizenbestaende des Free-Air Carbondioxid Enrichment (FACE)-Experimentes Maricopa (USA) Abschlussbericht

A version of the demeter model was developed which describes both the quantitative and qualitative effects of elevated atmospheric CO_2 on a wheat crop under conditions of limited water and/or nitrogen supply. In the model's photosynthesis and energy balance modules, first versions of components were developed which it should be possible to apply in further ecosystem models (starting with the cereals models of the demeter family). Experimental data from the Maricopa FACE wheat experiments 1992-1996, in which scientists from PIK were involved, were used for the development and testing of the model. Model solutions obtained were applied for the first time of central European climatic and site conditions as part of a regional yield study for the Federal State of Brandenburg. (orig.)Available from TIB Hannover: RR 5801(37) / FIZ - Fachinformationszzentrum Karlsruhe / TIB - Technische InformationsbibliothekSIGLEBundesministerium fuer Bildung, Wissenschaft, Forschung und Technologie, Bonn (Germany)DEGerman