in order to evaluate the effect of nitrogen absorption and use efficiency in relay intercropping for winter wheat and maize, a field experiment was conducted during 2008-2009 at the agricultural research station of ferdowsi university of mashhad, iran. a randomized block design with three replications was used. treatments included four combinations of relay intercropping of wheat and maize (thr...

for the financial support for the work und their generous trust. Miss Buechl provided additional administrative support and moral support during the studies in Germany. Esta obra de esfuerzo y trabajo conjunto esta dedicada a mi querida familia. SUMMARY South Mexico belongs to the Mesoamerican tropical region. The typical production systems are characterized on the one side by high diversity ho...

Many residents and fellows enter specialty training programs with vague notions as to what the clinical practice of their specialty will be like. Such speculation on the author’s part seems reasonable because the house staff is usually exposed to the specialty only in the hospital environment, and not in the private practitioner’s office. As well, there is little written information about the c...