75 research outputs found
Effects of paratilling on soil bulk density and infiltration
Non-Peer ReviewedParatilling is a form of non-inversion deep tillage sought after by producers for its
effectiveness at loosening soil structure without compromising the soil conservation
practices that are already employed on the farm. An experiment was set up to evaluate the
tillage effects of paratilling. Looking at changes to the soil physical properties, bulk
density and infiltration, and crop yield. Initially, paraplowing reduced bulk density and
soil strength but with over time these effects were eroded. At the Vertisolic site the
effects were lost before the end of the first growing season, which may be a result of
natural processes and the unusually wet spring. Infiltration increased as a result of
paratilling. Soil loosening did not increase yield suggesting that soil structure is not
limiting plant growth at these sites. Paratilling is only feasible if a yield response is
observed
Surface soil nutrient contents and crop yields after four to seven annual applications of manure
Non-Peer Reviewe
Diseases of the salivary glands in infants and adolescents
<p>Abstract</p> <p>Background</p> <p>Diseases of the salivary glands are rare in infants and children (with the exception of diseases such as parotitis epidemica and cytomegaly) and the therapeutic regimen differs from that in adults. It is therefore all the more important to gain exact and extensive insight into general and special aspects of pathological changes of the salivary glands in these age groups. Etiology and pathogenesis of these entities is still not yet fully known for the age group in question so that general rules for treatment, based on clinical experience, cannot be given, particularly in view of the small number of cases of the different diseases. Swellings of the salivary glands may be caused by acute and chronic inflammatory processes, by autoimmune diseases, by duct translocation due to sialolithiasis, and by tumors of varying dignity. Clinical examination and diagnosis has also to differentiate between salivary gland cysts and inflammation or tumors.</p> <p>Conclusion</p> <p>Salivary gland diseases are rare in childhood and adolescence. Their pattern of incidence differs very much from that of adults. Acute and chronic sialadenitis not responding to conservative treatment requires an appropriate surgical approach. The rareness of salivary gland tumors is particularly true for the malignant parotid tumors which are more frequent in juvenile patients, a fact that has to be considered in diagnosis and therapy.</p
The effect and acceptability of tympanometry and pneumatic otoscopy in general practitioner diagnosis and management of childhood ear disease
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