FATE OF PHOSPHORUS AnDED WITH URBAN
ثبت نشده
چکیده
The effect of successive applications of urban compost (up te 150 and 400 t ha-1 during eight years) en the status ef phosphorus in a calcareous soíl (20%) was testad in a greenhouse experimento An 6-15-15 complex fertiliser was also applied for comparison. Five years of ryegrass and three of horticultural plants (tomate and eggplant) were successively cropped during the experimento Increases of totaland available-P were observed wi th both organic and inorganic fertilisation. Total-P increased more in 50115 treated wlth the highest compost dose. Generally, aval1ableP was similar for s011s treated with the highest compost dos e and inorganlc fertiliser. Also a slight but significant increase oí organic-P was found in s011s treated with compost. Phosphoru5 added to 5011 tends to increase solubleplus exchangeable-P (more in inorganic fertiliser treatrnent), P in calcium phosphates (more in highest compost treatment) and residual-P, the latter being greater in 50115 treated with compost.
منابع مشابه
Evaluating nutrient impacts in urban watersheds: challenges and research opportunities.
This literature review focuses on the prevalence of nitrogen and phosphorus in urban environments and the complex relationships between land use and water quality. Extensive research in urban watersheds has broadened our knowledge about point and non-point pollutant sources, but the fate of nutrients is not completely understood. For example, it is not known how long-term nutrient cycling proce...
متن کاملFactors Affecting Stream Nutrient Loads: A Synthesis of Regional SPARROW Model Results for the Continental United States1
We compared the results of 12 recently calibrated regional SPARROW (SPAtially Referenced Regressions On Watershed attributes) models covering most of the continental United States to evaluate the consistency and regional differences in factors affecting stream nutrient loads. The models - 6 for total nitrogen and 6 for total phosphorus - all provide similar levels of prediction accuracy, but th...
متن کاملPhosphorus transport and retention in a channel draining an urban, tropical catchment with informal settlements
Urban catchments in sub-Saharan Africa (SSA) are increasingly becoming a major source of phosphorus (P) to downstream ecosystems. This is primarily due to large inputs of untreated wastewater to urban drainage channels, especially in informal settlements (or slums). However, the processes governing the fate of P in these catchments are largely unknown. In this study, these processes are investi...
متن کاملDecision support tools for urban water and wastewater systems--focussing on hazardous flows assessment.
The Swedish research programme Urban Water has developed a concept of a multi-criteria basis intended to support decision-making for urban water and wastewater systems. Five criteria groups were established for sustainability assessment of urban water systems: Health and Hygiene, Environment, Economy, Socio-culture, and Technology. Each criterion requires a set of indicators corresponding to qu...
متن کاملContrasting nitrogen and phosphorus budgets in urban watersheds and implications for managing urban water pollution.
Managing excess nutrients remains a major obstacle to improving ecosystem service benefits of urban waters. To inform more ecologically based landscape nutrient management, we compared watershed inputs, outputs, and retention for nitrogen (N) and phosphorus (P) in seven subwatersheds of the Mississippi River in St. Paul, Minnesota. Lawn fertilizer and pet waste dominated N and P inputs, respect...
متن کامل