Results 191 to 200 of about 7,838 (225)
Some of the next articles are maybe not open access.
Australian Journal of Plant Physiology, 1994
The nitrogen economies of six contrasting field pea (Pisum sativum L.) genotypes were examined at three widely separated sites in south Western Australia, using the 15N natural abundance technique to asssess proportional dependence on fixed N, harvests at peak biomass to assess total N yields and harvests at crop maturity to examine partitioning of N ...
EL Armstrong, JS Pate, MJ Unkovich
openaire +1 more source
The nitrogen economies of six contrasting field pea (Pisum sativum L.) genotypes were examined at three widely separated sites in south Western Australia, using the 15N natural abundance technique to asssess proportional dependence on fixed N, harvests at peak biomass to assess total N yields and harvests at crop maturity to examine partitioning of N ...
EL Armstrong, JS Pate, MJ Unkovich
openaire +1 more source
Water Research, 1996
Abstract Coupled nitrification-denitrification rates in sediments of the shallow lake Nuldernauw, The Netherlands, were measured using the N2 flux method and the 15N isotope pairing technique. It was clarified by different checks that the coupled nitrification-denitrification can be measured with the N2 flux method after a pre-incubation time of ...
van Luijn, F. +2 more
openaire +1 more source
Abstract Coupled nitrification-denitrification rates in sediments of the shallow lake Nuldernauw, The Netherlands, were measured using the N2 flux method and the 15N isotope pairing technique. It was clarified by different checks that the coupled nitrification-denitrification can be measured with the N2 flux method after a pre-incubation time of ...
van Luijn, F. +2 more
openaire +1 more source
Plant and Soil, 1995
Preliminary attempts to make retrospective studies of N balances and water stress in forest fertilization experiments by analyzing changes in the abundances of 15N and 13C, respectively, are discussed. Most evidence is from the Swedish Forest Optimum Nutrition Experiments, which have been running for two decades.
Peter Högberg +5 more
openaire +1 more source
Preliminary attempts to make retrospective studies of N balances and water stress in forest fertilization experiments by analyzing changes in the abundances of 15N and 13C, respectively, are discussed. Most evidence is from the Swedish Forest Optimum Nutrition Experiments, which have been running for two decades.
Peter Högberg +5 more
openaire +1 more source
Agroforestry Systems, 2010
Nitrogen inputs from biological nitrogen fixation contribute to productivity and sustainability of agroforestry systems but they need to be able to offset export of N when trees are harvested. This study assessed magnitudes of biological nitrogen fixation (natural 15N abundance) and N balance of Acacia mangium woodlots grown in farmer’s fields, and ...
Augustin R. Mercado +2 more
openaire +1 more source
Nitrogen inputs from biological nitrogen fixation contribute to productivity and sustainability of agroforestry systems but they need to be able to offset export of N when trees are harvested. This study assessed magnitudes of biological nitrogen fixation (natural 15N abundance) and N balance of Acacia mangium woodlots grown in farmer’s fields, and ...
Augustin R. Mercado +2 more
openaire +1 more source
[Urea utilization in growing lambs. 6. N balance with 15N urea].
Archiv fur Tierernahrung, 1988Lambs of an age of 2 or 4 months and of an average live weight of 14.7 and 27.4 kg resp. received rations consisting of 44% cereals, 46% dried sugar beet pulp, 6% wheat starch, 2% urea and 2% mineral-vitamin mixture. The crude protein content was 17.1 and 15.9% resp. in the dry matter, that of native crude protein 10.6 and 9.4% resp.
M, Ulbrich +3 more
openaire +1 more source
Archiv fur Tierernahrung, 1989
In an experiment 12 lambs of the merino species were divided into 4 groups. The variants HE received 740 or 718 EFU cattle/kg DM and the variants NE 689 or 671 EFU cattle/kg DM. The different energy concentrations resulted from differentiated quotas of dried sugar beet chips and wheat starch supplements.
M, Ulbrich +3 more
openaire +2 more sources
In an experiment 12 lambs of the merino species were divided into 4 groups. The variants HE received 740 or 718 EFU cattle/kg DM and the variants NE 689 or 671 EFU cattle/kg DM. The different energy concentrations resulted from differentiated quotas of dried sugar beet chips and wheat starch supplements.
M, Ulbrich +3 more
openaire +2 more sources
Archiv fur Tierernahrung, 1985
Three colostomised laying hybrids received 91.40 mg L-lysine-15N-excess (15N') each over a period of four days in a metabolism experiment with 15N-labelled lysine. After another four days, during which the hens received the same rations supplemented by commercial L-lysine, the animals were butchered and divided into individual fractions.
A, Hennig, K, Gruhn
openaire +1 more source
Three colostomised laying hybrids received 91.40 mg L-lysine-15N-excess (15N') each over a period of four days in a metabolism experiment with 15N-labelled lysine. After another four days, during which the hens received the same rations supplemented by commercial L-lysine, the animals were butchered and divided into individual fractions.
A, Hennig, K, Gruhn
openaire +1 more source
Journal of Contaminant Hydrology, 1995
Urine-affected areas can lead to considerable losses of N by leaching, ammonia volatilisation and denitrification from dairy pastures in the southeast of South Australia. Potable groundwater supplies are considered to have become contaminated by nitrate as a result of leaching from these leguminous pastures.
Naser Pakro, Peter Dillon
openaire +1 more source
Urine-affected areas can lead to considerable losses of N by leaching, ammonia volatilisation and denitrification from dairy pastures in the southeast of South Australia. Potable groundwater supplies are considered to have become contaminated by nitrate as a result of leaching from these leguminous pastures.
Naser Pakro, Peter Dillon
openaire +1 more source
Australian Journal of Soil Research, 1975
In a series of experiments, 15N-labelled nitrate fertilizer was used to study the nitrogen balance of a heavy clay soil. Two of the experiments employed 60-cm deep, 16-cm diameter columns of packed soil. In the first, no added 15N was lost until heavy rain saturated the soil in the undrained columns. Subsequently, fallow and planted columns lost 25% of
ET Craswell, AE Martin
openaire +1 more source
In a series of experiments, 15N-labelled nitrate fertilizer was used to study the nitrogen balance of a heavy clay soil. Two of the experiments employed 60-cm deep, 16-cm diameter columns of packed soil. In the first, no added 15N was lost until heavy rain saturated the soil in the undrained columns. Subsequently, fallow and planted columns lost 25% of
ET Craswell, AE Martin
openaire +1 more source
Environmental Science and Pollution Research, 2014
Ecological remediation is an important measure for the protection of lake water quality in removing nutrients, such as nitrate (NO3 (-)). In this study, four bioremediation processes (bare sediment, immobilized nitrogen cycling bacteria (INCB) added, Elodea nuttallii added, E. nuttallii-INCB assemblage) were operated at a lab to elucidate the effect of
Dandan, Liu +2 more
openaire +2 more sources
Ecological remediation is an important measure for the protection of lake water quality in removing nutrients, such as nitrate (NO3 (-)). In this study, four bioremediation processes (bare sediment, immobilized nitrogen cycling bacteria (INCB) added, Elodea nuttallii added, E. nuttallii-INCB assemblage) were operated at a lab to elucidate the effect of
Dandan, Liu +2 more
openaire +2 more sources