Effect of autumn regrowth interval and nitrogen fertiliser on dry matter yield and plant characteristics of six forage species

Martin, K.E.; Bryant, R H; Hodge, Simon; Edwards, G. R.

doi:10.33584/jnzg.2017.79.560

Cited by 4 publications

(3 citation statements)

References 19 publications

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“…At Awanui, compared to perennial ryegrass, differences in seasonal DM yield could have been worth approximately $470 and $690/ha for tall fescue and cocksfoot, respectively. Both tall fescue and cocksfoot are generally accepted to have lower quality than perennial ryegrass (e.g., Martin et al 2017) which could diminish the value of this potential yield advantage. Griffiths et al (2020) reported a 12.3 kg MS/ha increase in production from an increase in ME of 0.1 MJ/kg DM.…”

Section: Perennial Grass Trialsmentioning

confidence: 99%

Diversified pastures at the front line of climate change in Northland: farmers experiences, new directions and wider implications for other parts of the country

McCahon

McCahon²,

Ussher³

2021

NZGA R&P Series

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The persistence of both perennial ryegrass and white clover is challenged under summer-dry conditions. Future climate change projections indicate greater incidence and severity of summer moisture stress for many regions in New Zealand, and therefore, greater pressure on our traditional pasture base. The ‘Northland Diversified Forages Project’ aimed to identify alternative pasture species that provide an advantage in terms of dry matter yield, quality and/or timing of growth within a summer-dry environment, with a particular focus on legumes. A series of mown-plot trial and paddock demonstrations were established across a range of soil types to assess the potential of a wide variety of forage species. Perennial ryegrass and white clover both failed to persist, comprising less than 25% of the sward within 3 years of establishment. Cocksfoot demonstrated potential as a more persistent alternative to perennial ryegrass. However, whilst a range of legumes were successful at increasing the proportion of legume in the sward and total yield in the first year, significant challenges were identified in maintaining functional legumes across multiple years. This raises questions around whether we currently have the right species in New Zealand to adapt to a changing climate.

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Section: Perennial Grass Trialsmentioning

confidence: 99%

Diversified pastures at the front line of climate change in Northland: farmers experiences, new directions and wider implications for other parts of the country

McCahon

McCahon²,

Ussher³

2021

NZGA R&P Series

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“…Recent research trials in warm (Waikato) and cool (Canterbury) regions of NZ were established to identify which forages, and management practises, resulted in lower herbage N (or crude protein concentration, which is assumed to be 16% N). Results regarding nutritive value and management responses have been published for the cool (Box et al 2017a;Martin et al 2017a;Martin et al 2017b) and warm (Dodd et al 2017) regions. In the cooler region, with long-term average air temperature differing by ∼4 degrees C compared to the warm region, grasses had the lowest herbage N concentration (mean of 2.7% for perennial ryegrass, Italian ryegrass, tall fescue, cocksfoot and prairie grass) followed by herbs (mean of 3.1% for chicory and plantain).…”

Section: Reduced Herbage N Concentrationmentioning

confidence: 99%

Can alternative forages substantially reduce N leaching? findings from a review and associated modelling

Bryant

Snow

Shorten

et al. 2019

New Zealand Journal of Agricultural Research

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Nitrogen (N) leaching losses from grazed pasture systems pose a risk to the environment with mitigation strategies urgently required to achieve regulatory limits. There has been increased interest in alternative forages to manipulate excretion of urinary-N of livestock. This review summarises research on key forage attributes which affect the pattern of urine-N excretion. The literature showed an opportunity to alter both N concentration and moisture concentration of forages to reduce urine patch N loading. Complementary mitigations of extending the grazing rotation and reducing fertiliser were tested in simulations in addition to a diuresis effect on nitrate leaching in pastoral dairy systems. Findings suggested that forage species alone could not substantially reduce (by more than 20%) nitrate leaching. Combining all forage, management and systems-based solutions led to the greatest reductions in nitrate leaching, 59 and 31% for Waikato and Canterbury. Nonetheless, reductions in N loss came at the expense of pasture productivity which will likely affect profitability and farmer adoption of this suite of solutions in the absence of other drivers. The role of plant secondary metabolites in microbial dynamics has implications on N recycling in soil and rumen environments and this was identified as an area for further research.

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“…There is little scope for reducing perennial ryegrass N requirements through conventional plant breeding because there is very little intra-species variation (Chapman et al, 2015). These high CP and RDP concentrations in pasture can be further exacerbated by short regrowth intervals between grazings and by N fertilizer inputs (Martin et al, 2017).…”

mentioning

confidence: 99%

Supplementation of urea to a basal pasture diet fed to dairy cows to model N-partitioning relationships

et al. 2021

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Nitrogen balance studies using pasture-fed cows may be useful in trialing strategies for reducing urinary nitrogen deposition on pasture. Being able to alter dietary nitrogen is critical to being able to evaluate mitigation strategies, but it is difficult to investigate differing levels of dietary nitrogen in dairy cows fed pasture, without confounding other nutritional variables. This study investigated the use of urea supplementation in rumen-fistulated dairy cows as an experimental model of varying dietary nitrogen content for cows fed pasture without altering other dietary components. Relationships between both nitrogen intake and urinary nitrogen output were consistent with those reported in international studies. Urea supplementation could be used as a novel experimental model to evaluate urinary nitrogen mitigation strategies.

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Effect of autumn regrowth interval and nitrogen fertiliser on dry matter yield and plant characteristics of six forage species

Cited by 4 publications

References 19 publications

Diversified pastures at the front line of climate change in Northland: farmers experiences, new directions and wider implications for other parts of the country

Diversified pastures at the front line of climate change in Northland: farmers experiences, new directions and wider implications for other parts of the country

Can alternative forages substantially reduce N leaching? findings from a review and associated modelling

Supplementation of urea to a basal pasture diet fed to dairy cows to model N-partitioning relationships

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