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The interactive effects of nitrogen fertiliser and animal urine on nitrogen efficiency and losses in New Zealand dairy farming systems
(Lincoln University, 2013)
The loss of nitrogen (N) through nitrate (NO₃⁻) leaching and nitrous oxide (N₂O) emissions from pastoral dairy systems is one of the largest challenges facing the New Zealand agricultural industry. Nitrate leaching ...
Soil phosphorus dynamics and bioavailability in New Zealand forest ecosystems
(Lincoln University, 2013)
Phosphorus (P) is an essential element for all living organisms and the productivity of natural and managed ecosystems is generally limited by the bioavailability of P in soil. Previous studies showed that significant ...
Liming effects on legume production and phosphorus availability in acid South Island hill and high country soils : A thesis submitted in partial fulfilment of the requirements for the Degree of Doctor of Philosophy at Lincoln University
(Lincoln University, 2019)
There is large potential for widespread development and increased production in South Island hill and high country by increasing legume production. Despite regular past applications of superphosphate fertiliser, current ...
Nitrification inhibition by common plants in New Zealand’s agricultural landscapes
(Lincoln University, 2013)
Nitrification, the production of nitrate by the bacterial oxidation of ammonium, is an important economic and environmental issue in New Zealand. Nitrification can lead to high levels of fertiliser nitrogen loss from soil ...
Tracing critical source areas of phosphorus in grassland catchments
(Lincoln University, 2011)
Grassland farming systems are an important contributor to the New Zealand economy, however recent expansions in dairying have lead to increasing concern about its effects on water quality. Phosphorus (P) and sediment losses ...
Effects of carbon substrate and irrigation on carbon dioxide emissions and denitrification for three grassland soils : A thesis submitted in partial fulfilment of the requirements for the Degree of Doctor of Philosophy at Lincoln University
(Lincoln University, 2019)
Conversion of non irrigated grassland to high−intensity farm systems with irrigation is a major land−use change to enable a higher yield year−round in New Zealand. Research is needed to better understand the links between ...
Influence of soil pH, phosphorus and sulphur on the frequency of rhizobia genotypes found in four pasture legume species grown in an acid high country soil
(Lincoln University, 2014)
South Island hill and high country soils typically have deficiencies of nitrogen, phosphorus, sulphur and molybdenum. The soils often have low pH and as such, high levels of exchangeable aluminium and manganese, causing ...
Farmers'' perceptions of ECAN’s proposed, “good practice discharge allowance” in the Waimakariri sub region of Environment Canterbury’s (ECAN) district of New Zealand.
(Lincoln University, 2014)
Eutrophication is an excessive richness of nutrients in a lake or other body of water, frequently due to run-off from the land, which causes a dense growth of plant life. Eutrophication is generally stated as the main ...
The interaction of New Zealand native plants with nitrogen in Canterbury’s agricultural landscapes
(Lincoln University, 2014)
Less than 0.5 % native vegetation cover remains in the productive Canterbury Plains region of New Zealand. Incorporating native plants into agricultural landscapes could provide numerous benefits including shelter, ...
Microbiological risk assessment of fresh produce grown in Canterbury, New Zealand
(Lincoln University, 2015)
A recent trend to consume healthy foods has led to greater preference for natural food and raw vegetables. At the same time, concerns have increased about the microbiological risks of fresh produce. This thesis focusses ...