7 research outputs found
Bly og andre tungmetaller i salat dyrket i torv tĂžrket med spillolje
En rekke veksttorvprodukter er analysert pÄ tungmetaller. Til sammenligning er ogsÄ naturtorv bÄde i rÄ og i tÞrket tilstand, nÄr tÞrkingen har foregÄtt ved direkte innblÄsing av forbrenningsgasser fra spillolje, ogsÄ analysert ( tabell 1). Det viser seg Ä vÊre et forholdsvis hÞyt innhold av enkelte elementer i tÞrket naturtorv og dette skyldes i fÞrste rekke kvaliteten av spilloljen. Det viser seg imidlertid ogsÄ Ä vÊre innhold som skyldes forurensninger i tilsetningsstoffer som FullgjÞdsel, rÄfosfat og kalk. Opptaket av tungmetaller i salat ser ut til Ä vÊre mere pÄvirket av forurensningene i tilsetningsstoffene enn forurensningene som skyldes spilloljen
Interaction between elevated atmospheric concentration of CO2 and humidity on plant growth: comparison between cotton and radish
The 18S and 28S rDNA identity and phylogeny of the common lotic chrysophyte Hydrurus foetidus
Biomass and Accumulation of Potassium, Calcium, and Magnesium in Gladiolus as Affected by Heat Units and Corm Size
Closed hydroponic systems : operational parameters, root exudates occurrence and related water treatment
Greenhouse production of vegetables in closed hydroponic cropping systems is a resource-efficient technique for the production of high-quality produce with a high yield per unit area. Recently, there have been considerable progresses in the development of hydroponic culture. While this type of cropping system allows savings in terms of water and nutrient use, the recirculation of water increases the risk of root exudates dispersal. Plant roots often exude numerous organic acids, which are known to inhibit growth. So far several methods have been found to be effective in removing or degrading the phytotoxic substances released from plant roots during autotoxicity such as adsorption by activated carbon, electrodegradation of root exudates and TiO2 photocatalysis. In this review an overview will be presented of hydroponic systems and their related root exudates occurrence and removal