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Increased soil nitrogen supply enhances root-derived available soil carbon leading to reduced potential nitrification activity
(Elsevier, 2021-03)
Nitrogen (N) immobilisation by heterotrophic microorganisms is critical for reducing N losses from soils and ensuring a long-term supply of N to plants in grassland ecosystems. The supply of carbon (C) available to soil ...
Cattle diet and winter plant growth effects on nitrogen losses from cattle urine patches
(Springer Nature, 2020-04-01)
Nitrogen (N) losses from agricultural land is a major environmental concern, as N leaching can cause eutrophication and nitrous oxide (N₂O) is a greenhouse gas. A lysimeter experiment was undertaken to investigate the ...
Effects of plantain in pasture on nitrous oxide emissions from cattle urine patches, as affected by urine deposition timing and soil type
(Taylor & Francis on behalf of The Royal Society of New Zealand, 2021-10-17)
Two lysimeter experiments were conducted to quantify the effect of including plantain in pasture on nitrous oxide (N₂O) emissions from cattle urine patches, as affected by urine deposition timing and soil type. In experiment ...
Farm-scale carbon and nitrogen fluxes in pastoral dairy production systems using different nitrogen fertilizer regimes
(Springer, 2020)
The nitrogen (N) fertilizer application rate (kg ha−1 year−1) in pastoral dairy systems affects the flow of N through the soil, plant and animal pools of the system. With better understanding of the magnitude of these pools ...
Production, profit and nitrogen flows in irrigated dairy systems representing different industry development pathways: The Pastoral 21 experience in Canterbury
(Taylor & Francis on behalf of the Royal Society of New Zealand, 2020-08-26)
Future development pathways for irrigated dairy farms in Canterbury operating under stricter nitrogen (N) loss limits were compared in two farmlets over four years. One represented the traditional pathway of intensification ...
Assessment of spatial and temporal variability in soil moisture using multi-length TDR probes to calibrate Aquaflex sensors
(Springer Nature, 2021-07-15)
Despite subtle variations in soil moisture (SM) across a paddock, irrigation scheduling in New Zealand dairy farms is solely based on the SM monitored at a single location, primarily using an Aquaflex soil moisture sensor ...
Modelling: Effect of feeding plantain pasture to three different breeds of calf/heifer on weight gain and nitrogen leaching in Canterbury
(Taylor and Francis on behalf of the Royal Society of New Zealand, 2020)
Four levels of plantain (0%, 25%, 50% and 75% on DM basis) inclusion rate to ryegrass-clover pasture and three target heifer mature live weights, 444 kg (representing Jersey), 529 kg (Friesian), and 492 kg (cross bred ...
Effects of adding readily available carbon to soil on nitrogen losses from cattle urine patches
(Taylor & Francis on behalf of the Royal Society of New Zealand, 2020)
A lysimeter experiment was carried out to investigate the effects of applying readily available carbon (12 or 24 t sucrose ha−1) to soil on nitrogen (N) losses from cattle urine patches. The carbon (C) was readily available ...
Effect of timing of cattle urine deposition and pasture composition on nitrogen leaching losses
(Wiley on behalf of British Society of Soil Science, 2020-09-20)
A lysimeter experiment using undisturbed monoliths from a stony silt loam soil was carried out to quantify the effects different pasture types on N losses from urine applied to soil on different dates. Three pasture types ...