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The Use of Roots to Test N, P and K Deficiencies in Eucalyptus Nutrition
Item type: Journal Article • Journal: South African Forestry Journal • Authors: John Dighton --- , HelenE. Jones --- ,Bioassays have been developed which can provide diagnostics of the nutritional status of trees. They measure the flux of N, P or Rb for K into roots from standard solutions where the rate of influx is inversely related to nutrient... -
Persistence of the pesticidal Bacillus thuringiensis protein expressed in Bt maize plant materials in two soils of the Central Eastern Cape, South Africa
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: P. Muchaonyerwa --- Department of Agronomy, South Africa S.M. Waladde --- Department of Zoology, South AfricaEnvironmental effects of genetically modified plants are not yet fully understood. Experiments were conducted to determine relative amounts of the bioactive Bt protein in roots, leaves and stems of Bt maize and persistence of the protein in two soil forms... -
Joint action toxicity of spent lubrication oil and laundry detergent against Poecilia reticulata (Telostei: Poeciliidae)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: AdebayoA OtitolojuSingle and joint action bioassays using spent lubrication oil, laundry detergent and a mixture of both (based on a 1:1 ratio of their 96h LC50 values) against the guppy Poecilia reticulata were carried out. On the basis of 96h mortality... -
Evaluation of the acute toxicity of refined petroleum products against Pila ovata (Gastropoda: Ampullariidae) and Poecilia reticulata (Teleostei: Poeciliidae)
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: BlessingJ OribhaborStatic and static-renewal evaluation of the acute toxicity of three refined petroleum products — petrol, kerosene and diesel — against two freshwater animals, the mollusc Pila ovata and the fish Poecilia reticulata, was conducted in the laboratory. Petrol, kerosene and... -
The effects of different gold mine tailings on growth, reproduction and avoidance-behaviour of earthworms
Item type: Journal Article • Journal: African Zoology • Authors: Bryan McGuirk --- Unit for Environmental Sciences and Management, South Africa Pieter Theron --- Unit for Environmental Sciences and Management, South Africa Mark Maboeta --- Unit for Environmental Sciences and Management, South AfricaThe mining industry plays a key role in the economic development of South Africa as one of the largest exporters of valuable resources, such as gold, platinum group metals and other metals and minerals. Unfortunately, mining produces large volumes of...