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Nitrogen losses from urea, UAN and LAN when applied to four different soils
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. D.P. Botha --- , Republic of South AfricaNitrogen transformations and losses from three nitrogenous fertilizers, urea, urea ammonium nitrate (UAN) and limestone ammonium nitrate (LAN), when applied to four South African soils, were compared in a laboratory study. The highest losses on all these soils were experienced... -
Ammonia volatilization and denitrification losses from commercial fertilizers applied to soil samples
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: A. D.P. Botha --- , Republic of South Africa D.C. Pretorius --- , Republic of South AfricaNitrogen losses from nine nitrogen fertilizers, applied to four different topsoil samples, were compared in the laboratory. Total N losses were determined 28 days after application, as a difference between the extractable soil nitrogen initially and after 28 days. The... -
Kinetika van nitrifikasie in gronde van die sentrale besproeiingsgebiede in Suid-Afrika
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: D.J. Laubscher --- Departement van Grondkunde, Republiek van Suid-Afrika C.C. du Preez --- Departement van Grondkunde, Republiek van Suid-AfrikaDie verloop van nitrifikasie is in agt gronde, afkomstig van die sentrale besproeiingsgebiede, gemonitor na toediening van (NH4)2SO4 teen die ekwivalent van 100 kg N ha−1 aan beide die bo- en ondergronde. Tydens inkubasie by 30°C is die NH4 +,... -
Stimulation and suppression of mineralisation and nitrification in incubated soil
Item type: Journal Article • Journal: South African Journal of Plant and Soil • Authors: K. Agrella --- Department of Plant Production and Soil Science, South Africa P. Boeckx --- Department of Applied Analytical and Physical Chemistry, Belgium A.S. Claassens --- Department of Plant Production and Soil Science, South Africa O. Van Cleemput --- Department of Applied Analytical and Physical Chemistry, BelgiumPriming, induced through the addition of oxidisable organic matter, releases or immobilises nitrogen and other nutrients in the soil. Moisture plays a very important role in priming as it stimulates microbial activity after a dry soil is wetted, especially with... -
NITROGEN TRANFORMATIONS AND THE NITROGEN BUDGET OF A HYPERTROPHIC IMPOUNDMENT (HARTBEESPOORT DAM, SOUTH AFRICA)
Item type: Journal Article • Journal: Journal of the Limnological Society of Southern Africa • Authors: P.J. Ashton --- , South AfricaThe major components of the nitrogen balance of hypertrophic Hartbeespoort Dam were studied at weekly intervals from October 1980 to September 1984. The Crocodile River contributed over 80Z of the hydraulic load and over 97X of the annual total nitrogen... -
Seasonal distribution and activity of nitrogen-cycling bacteria in Bardawil Lagoon, Egypt
Item type: Journal Article • Journal: African Journal of Aquatic Science • Authors: A Dewedar --- Department of Botany, Egypt M Bahgat --- Faculty of Sciences, Egypt EE Shabana --- Department of Botany, EgyptThe ecological significance of Bardawil Lagoon, the only oligotrophic hypersaline lagoon on the Mediterranean coast of Egypt, was assessed through studying counts, activities and the distribution of nitrogen-cycling bacteria. Counts and activities of ammonifying bacteria, ammonium-oxidising microbes (AOM) and nitrite-oxidising...