RESUMO
Nutrient leaching from agricultural soils is a worldwide problem that has been implicated in deleterious impacts on the environment. Application of biochar to soil has been proposed as a means to reduce nutrient leaching and improve fertilizer use efficiency. The potential for biochar to reduce nutrient leaching and increase fertilizer use efficiency was tested by applying 47 Mg ha hardwood biochar before replanting a commercial apple () orchard, in the Huon Valley, Tasmania. Passive wick flux meters were installed at the base of the A1 horizon at a depth of 25 cm to monitor leachate volume and the concentration of nutrients leached below the A1 soil horizon over a 38 mo period. Biochar application significantly increased the concentration of phosphorous in the leachate, while having no significant effect on nitrate or potassium concentration. The volume of leachate collected in the flux meters was significantly higher in the biochar treatment, which resulted in significantly higher amounts of potassium and phosphorous being leaching from the biochar treatment than the control. Biochar application had no significant effect on either the concentration or the flux of nitrate leached from the A1 horizon. Nonetheless, nutrient application was well in excess of tree requirements, such that between 53 to 78% of the applied nitrogen, 5 to 11% of the applied phosphate, and 69 to 112% of the applied potassium were leached below the A1 horizon.
RESUMO
INTRODUCTION: It is important that acute compartment syndrome is recognised and treated early. Treatment involves surgical decompression and it is imperative that this is performed in a timely and appropriate manner. The knowledge of plastic and orthopaedic surgery trainees of the safe technique for performing lower leg fasciotomy was examined. METHODS: Survey of knowledge of fasciotomy was performed amongst plastic and orthopaedic surgery trainees. They were asked to fill in a questionnaire during a regional teaching session. RESULTS: There were 29 respondents; 19 plastic surgery trainees and 10 from orthopaedic surgery. Most trainees had little experience of watching, assisting or performing fasciotomies. When asked to mark the placement of fasciotomy incisions and plane of dissection, only 47% of plastic and 10% of orthopaedic surgery trainees were correct. DISCUSSION: Clinical experience and knowledge of lower leg fasciotomy is poor amongst trainees surveyed. In this paper, the pathophysiology, diagnosis and treatment of compartment syndrome are described. Examples of poorly placed fasciotomy incisions, as well as the consequences of these, are also presented.
