Playne (1970) suggested that the levels of sodium (Na) in some tropical grasses are below those considered sufficient for the requirements of lactating cows. We examined the concentration of Na in guinea grass from a number of areas in Queensland. Levels in creeping guinea (P. maximum Q 8132), P. maximum cv. Coloniao, P. maximum cv. Hamil and P. maximum (C.P.I. 37910, Makeuni) ranged from 0.007...

The important role of earthworms in the biomagnification of heavy metals in terrestrial ecosystems is widely recognised. Differences in earthworm biomass between sites is mostly not accounted for in ecological risk assessment. These differences may be large depending on soil properties and pollution status. A survey of earthworm biomass and colonisation rate was carried out on dredged sediment-...

1. Brandyk, T., 1988. Characteristic water reserves in some alluvial soils of the Vistula estuary). Roczniki Gleboznawcze – Soil Science Annual 39(1), 29–40. (in Polish with English abstract). Google Scholar

While bitter manioc has been one of the most important staple crops in the central Amazon for thousands of years, there have been few studies of its cultivation in the fertile whitewater landscapes of this region. Anthropological research on bitter manioc cultivation in the Amazon has focused almost exclusively on long-fallow shifting cultivation in marginal upland areas of low soil fertility. ...

The environmental impact of deposit development can be indirect and cause combined geochemical processes in ecosystems. These must taken into consideration under forecasting risk assessment. Soil degradation the Taiga Forest is considered, within area Verkhnekamskoye potash (Russia), as an example such transformation. Here, mechanism characteristics anthropogenic salinisation alluvial soils are...

the potassium pools of five major physiographic units of urmia region in western azarbaijan province were studied to investigate the distribution of k forms as a function of clay mineralogy and physiographic units. for this, soil samples from different horizons of ten pedons were selected and analyzed for physiochemical properties, mineralogy of clay fraction, and forms of k. analyses of xrd re...

retention in alluvium-derived soils of headwater ephemeral streams. Zuni farmers of western New Mexico demonstrate knowledge Peterson et al. (2001) create a convincing case for about soil and hydrological processes that link upland watersheds to alluvium-derived soils that have crucial cultural, ecological, and conservation that maintains or restores the storage cahydrological functions. To def...