Management practices for control of runoff losses from cotton furrows under storm rainfall. I. Runoff and sediment on a black Vertosol

Improved practices are needed to minimise soil erosion and related agrochemical transport from cotton fields during rain. We evaluated two options available to cotton growers, namely retention of surface cover and controlling wheel traffic, using simulated rain on a hill–furrow system on a well-aggregated black Vertosol. A companion paper explores effects on pesticide transport. Increasing cover resulted in an increase in the rain ultivar by use the fetus lacks the appropriate enzyme systems, clearance of toxic substances takes place via the placenta and maternal liver. Thus, a suitable in vitro system can effectively differentiate between primary and secondary drug effects. In the present study, 13-day-old fetal testis, at the stage of incipient differentiation, were cultured for 4 days in vitro in the presence of graded doses of caffeine, theophylline or theobromine. It was found that explants exposed to caffeine or theobromine differentiated normally, developing seminiferous cords made up of Sertoli and germ cells, soon followed by the differentiation of functionally active Leydig cells appearing in the newly formed interstitium. However, explants exposed to theophylline failed to develop seminiferous cords and, as a consequence, Leydig cells. In conclusion, insights obtained from different experimental methods, such as organ culture or whole organism studies, are not always identical. It may be prudent, therefore, to take into account that certain experimental techniques, despite providing valuable information, may require confirmation by other Keywords: soil erosion, deposition, stubble retention, controlled traffic, cracking clay, sediment size. Australian Journal of Soil Research 40(1) 1 - 20 Full text doi:10.1071/SR00082 © CSIRO 2002