List of works - Stewart Ledgard

Administration of dicyandiamide to dairy cows via drinking water reduces nitrogen losses from grazed pastures

Ammonia emissions from intensive dairying: a comparison of contrasting systems in the United Kingdom and New Zealand

article

An analysis of environmental and economic implications of nil and restricted grazing systems designed to reduce nitrate leaching from New Zealand dairy farms. I. Nitrogen losses

article

Application of carbon additives to reduce nitrogen leaching from cattle urine patches on pasture

Assessing nitrogen transfer from legumes to associated grasses

Assessment of the relative uptake of added and indigenous soil nitrogen by nodulated legumes and reference plants in the 15N dilution measurement of N2 fixation: Derivation of method

article

Assessment of the relative uptake of added and indigenous soil nitrogen by nodulated legumes and reference plants in the 15N dilution measurement of N2 fixation: Glasshouse application of method

article

Biological nitrogen fixation in mixed legume/grass pastures

scholarly article by S. F. Ledgard & K. W. Steele published March 1992 in Plant and Soil

Dung and farm dairy effluent affect urine patch nitrous oxide emissions from a pasture

EFFECT OF THE STOCKING RATE AND LAND SLOPE ON NITROGEN LOSSES TO WATER ON A GRAZED PASTURE OF SOUTHERN CHILE

article

Effect of clover cultivar on production and nitrogen fixation in clover-ryegrass swards under dairy cow grazing

article

Effect of dicyandiamide (DCD) on nitrous oxide emissions from cow urine deposited on a pasture soil, as influenced by DCD application method and rate

Effect of rate and form of dicyandiamide application on nitrate leaching and pasture production from a volcanic ash soil in the Waikato

article

Effect of reference plant on estimation of nitrogen fixation by subterranean clover using 15N methods

article

Effect of timing and formulation of dicyandiamide (DCD) application on nitrate leaching and pasture production in a Bay of Plenty pastoral soil

article

Effects of cow urine and its major constituents on pasture properties

Effects of nitrogen fertiliser and urine on pasture performance and the influence of soil phosphorus and potassium status

Effects of the nitrification inhibitor dicyandiamide (DCD) on pasture production, nitrous oxide emissions and nitrate leaching in Waikato, New Zealand

article

Environmental impacts of different nitrogen inputs on dairy farms and implications for the Resource Management Act of New Zealand

article

Farm-specific carbon footprinting to the farm gate for agricultural co-products using the OVERSEER® model.

scientific article published in June 2013

Fate of 15N labelled urine on four soil types

Fate of 15N-labelled nitrogen fertilizer applied to kiwifruit (Actinidia deliciosa) vines. I. 15N recovery in plant and soil

scholarly article by S. F. Ledgard et al published November 1992 in Plant and Soil

Fate of 15N-labelled nitrogen fertilizer applied to kiwifruit (Actinidia deliciosa) vines. II. Temporal changes in 15N within vines

scholarly article by S. F. Ledgard & G. S. Smith published November 1992 in Plant and Soil

Field evaluation of 15N techniques for estimating nitrogen fixation in legume-grass associations

article

Impact of greenhouse gas metrics on the quantification of agricultural emissions and farm-scale mitigation strategies: a New Zealand case study

article

Increased stocking rate and associated strategic dry-off decision rules reduced the amount of nitrate-N leached under grazing.

scientific article published on 3 May 2016

Influence of some soil and pasture components on the growth of hill country pastures

Influence of some soil and pasture components on the growth of hill country pastures 1. Winter and spring production

article

Influence of time of application on the fate of15N-labelled urea applied to dairy pasture

Influence of time of application on the utilization of nitrogen fertilizer by asparagus, estimated using 15N

article

LCA of wool textiles and clothing

scholarly article published 2015

Nitrogen concentration in the urine of cattle, sheep and deer grazing a common ryegrass/cocksfoot/white clover pasture

article by CJ Hoogendoorn et al published September 2010 in New Zealand Journal of Agricultural Research

Nitrogen cycling in low input legume-based agriculture, with emphasis on legume/grass pastures

Nitrogen fixation by white clover in pastures grazed by dairy cows: Temporal variation and effects of nitrogen fertilization

Nitrogen inputs and losses from clover/grass pastures grazed by dairy cows, as affected by nitrogen fertilizer application

Nitrogen leaching from sheep-, cattle- and deer-grazed pastures in the Lake Taupo catchment in New Zealand

article

Nitrous oxide and greenhouse gas emissions from grazed pastures as affected by use of nitrification inhibitor and restricted grazing regime ⬇️

scientific article published on January 29, 2013

Nitrous oxide emission factors for urine and dung from sheep fed either fresh forage rape (Brassica napus L.) or fresh perennial ryegrass (Lolium perenne L.).

scientific article published on 19 November 2014

Nitrous oxide emissions from application of urea on New Zealand pasture

article

Nutrient losses and greenhouse gas emissions from dairy production in China: Lessons learned from historical changes and regional differences.

scientific article published on 2 May 2017

Nutrient management in New Zealand pastures— recent developments and future issues

article

Nutrition, moisture and rhizobial strain influence isotopic fractionation during N2, fixation in pasture legumes

Optimisation of nutrient cycling and soil quality for sustainable grasslands

Plant uptake and microbial immobilization of 15N-labelled ammonium applied to grass-clover pasture—influence of simulated winter temperature and time of application

article

Production and nitrogen fixation by ‘Grasslands Kopu’ and ‘Grasslands Huia’ white clovers under different nitrogen regimes

article

Productivity of white clover cultivars under intensive grazing, as affected by high nitrogen fertiliser application

article by S. F. Ledgard et al published December 1995 in New Zealand Journal of Agricultural Research

Responses of a New Zealand North Island hill perennial ryegrass collection to nitrogen, moisture stress, and grass grub (Costelytra zealandica) infestation

article

Salt as a mitigation option for decreasing nitrogen leaching losses from grazed pastures

scientific article

Sawdust and bark to treat nitrogen and faecal bacteria in winter stand‐off pads on a dairy farm

article

Short-term nitrogen fluxes in grassland soils under different long-term nitrogen management regimes

article published in 1998

Soil N process inhibitors alter nitrogen leaching dynamics in a pumice soil

article

Strategies to mitigate nitrous oxide emissions from herbivore production systems.

scientific article

Sulphur inputs from rainfall throughout New Zealand

article

The Impact of Grazing Animals on N2 Fixation in Legume-Based Pastures and Management Options for Improvement

The effect of a single application of cow urine on annual N2 fixation under varying simulated grazing intensity, as measured by four 15N isotope techniques

The effectiveness of a granular formulation of dicyandiamide (DCD) in limiting nitrate leaching from a grazed dairy pasture

article by R. M. Monaghan et al published June 2009 in New Zealand Journal of Agricultural Research

The effectiveness of different nitrification inhibitor formulations in limiting nitrate accumulation in a Southland pastoral soil

article by L. C. Smith et al published December 2005 in New Zealand Journal of Agricultural Research

Transfer of fixed nitrogen from white clover to associated grasses in swards grazed by dairy cows, estimated using 15N methods

article

Use of labelled nitrogen to measure gross and net rates of mineralization and microbial activity in permanent pastures following fertilizer applications at different time intervals.

scientific article published on January 2002

Using the OVERSEER nutrient budget model to estimate on-farm greenhouse gas emissions

article

Variability in pasture nitrogen fractions and the relationship to bloat

Variations in natural enrichment of 15N in the profiles of some Australian pasture soils

article

List of works by Stewart Ledgard

Administration of dicyandiamide to dairy cows via drinking water reduces nitrogen losses from grazed pastures

Ammonia emissions from intensive dairying: a comparison of contrasting systems in the United Kingdom and New Zealand

An analysis of environmental and economic implications of nil and restricted grazing systems designed to reduce nitrate leaching from New Zealand dairy farms. I. Nitrogen losses

Application of carbon additives to reduce nitrogen leaching from cattle urine patches on pasture

Assessing nitrogen transfer from legumes to associated grasses

Assessment of the relative uptake of added and indigenous soil nitrogen by nodulated legumes and reference plants in the 15N dilution measurement of N2 fixation: Derivation of method

Assessment of the relative uptake of added and indigenous soil nitrogen by nodulated legumes and reference plants in the 15N dilution measurement of N2 fixation: Glasshouse application of method

Biological nitrogen fixation in mixed legume/grass pastures

Dung and farm dairy effluent affect urine patch nitrous oxide emissions from a pasture

EFFECT OF THE STOCKING RATE AND LAND SLOPE ON NITROGEN LOSSES TO WATER ON A GRAZED PASTURE OF SOUTHERN CHILE

Effect of clover cultivar on production and nitrogen fixation in clover-ryegrass swards under dairy cow grazing

Effect of dicyandiamide (DCD) on nitrous oxide emissions from cow urine deposited on a pasture soil, as influenced by DCD application method and rate

Effect of rate and form of dicyandiamide application on nitrate leaching and pasture production from a volcanic ash soil in the Waikato

Effect of reference plant on estimation of nitrogen fixation by subterranean clover using 15N methods

Effect of timing and formulation of dicyandiamide (DCD) application on nitrate leaching and pasture production in a Bay of Plenty pastoral soil

Effects of cow urine and its major constituents on pasture properties

Effects of nitrogen fertiliser and urine on pasture performance and the influence of soil phosphorus and potassium status

Effects of the nitrification inhibitor dicyandiamide (DCD) on pasture production, nitrous oxide emissions and nitrate leaching in Waikato, New Zealand

Environmental impacts of different nitrogen inputs on dairy farms and implications for the Resource Management Act of New Zealand

Farm-specific carbon footprinting to the farm gate for agricultural co-products using the OVERSEER® model.

Fate of 15N labelled urine on four soil types

Fate of 15N-labelled nitrogen fertilizer applied to kiwifruit (Actinidia deliciosa) vines. I. 15N recovery in plant and soil

Fate of 15N-labelled nitrogen fertilizer applied to kiwifruit (Actinidia deliciosa) vines. II. Temporal changes in 15N within vines

Field evaluation of 15N techniques for estimating nitrogen fixation in legume-grass associations

Impact of greenhouse gas metrics on the quantification of agricultural emissions and farm-scale mitigation strategies: a New Zealand case study

Increased stocking rate and associated strategic dry-off decision rules reduced the amount of nitrate-N leached under grazing.

Influence of some soil and pasture components on the growth of hill country pastures

Influence of some soil and pasture components on the growth of hill country pastures 1. Winter and spring production

Influence of time of application on the fate of15N-labelled urea applied to dairy pasture

Influence of time of application on the utilization of nitrogen fertilizer by asparagus, estimated using 15N

LCA of wool textiles and clothing

Nitrogen concentration in the urine of cattle, sheep and deer grazing a common ryegrass/cocksfoot/white clover pasture

Nitrogen cycling in low input legume-based agriculture, with emphasis on legume/grass pastures

Nitrogen fixation by white clover in pastures grazed by dairy cows: Temporal variation and effects of nitrogen fertilization

Nitrogen inputs and losses from clover/grass pastures grazed by dairy cows, as affected by nitrogen fertilizer application

Nitrogen leaching from sheep-, cattle- and deer-grazed pastures in the Lake Taupo catchment in New Zealand

Nitrous oxide and greenhouse gas emissions from grazed pastures as affected by use of nitrification inhibitor and restricted grazing regime ⬇️

Nitrous oxide emission factors for urine and dung from sheep fed either fresh forage rape (Brassica napus L.) or fresh perennial ryegrass (Lolium perenne L.).

Nitrous oxide emissions from application of urea on New Zealand pasture

Nutrient losses and greenhouse gas emissions from dairy production in China: Lessons learned from historical changes and regional differences.

Nutrient management in New Zealand pastures— recent developments and future issues

Nutrition, moisture and rhizobial strain influence isotopic fractionation during N2, fixation in pasture legumes

Optimisation of nutrient cycling and soil quality for sustainable grasslands

Plant uptake and microbial immobilization of 15N-labelled ammonium applied to grass-clover pasture—influence of simulated winter temperature and time of application

Production and nitrogen fixation by ‘Grasslands Kopu’ and ‘Grasslands Huia’ white clovers under different nitrogen regimes

Productivity of white clover cultivars under intensive grazing, as affected by high nitrogen fertiliser application

Responses of a New Zealand North Island hill perennial ryegrass collection to nitrogen, moisture stress, and grass grub (Costelytra zealandica) infestation

Salt as a mitigation option for decreasing nitrogen leaching losses from grazed pastures

Sawdust and bark to treat nitrogen and faecal bacteria in winter stand‐off pads on a dairy farm

Short-term nitrogen fluxes in grassland soils under different long-term nitrogen management regimes

Soil N process inhibitors alter nitrogen leaching dynamics in a pumice soil

Strategies to mitigate nitrous oxide emissions from herbivore production systems.

Sulphur inputs from rainfall throughout New Zealand

The Impact of Grazing Animals on N2 Fixation in Legume-Based Pastures and Management Options for Improvement

The effect of a single application of cow urine on annual N2 fixation under varying simulated grazing intensity, as measured by four 15N isotope techniques

The effectiveness of a granular formulation of dicyandiamide (DCD) in limiting nitrate leaching from a grazed dairy pasture

The effectiveness of different nitrification inhibitor formulations in limiting nitrate accumulation in a Southland pastoral soil

Transfer of fixed nitrogen from white clover to associated grasses in swards grazed by dairy cows, estimated using 15N methods

Use of labelled nitrogen to measure gross and net rates of mineralization and microbial activity in permanent pastures following fertilizer applications at different time intervals.

Using the OVERSEER nutrient budget model to estimate on-farm greenhouse gas emissions

Variability in pasture nitrogen fractions and the relationship to bloat

Variations in natural enrichment of 15N in the profiles of some Australian pasture soils