Grazing strategies for resilience of ryegrass (Lolium perenne) dominant pastures in hill country
Katherine Tozer
A C , Karin Müller B , Anthony Craven A and Catherine Cameron A
+ Author Affiliations
- Author Affiliations
A AgResearch, Private Bag 3123, Hamilton 3240, New Zealand.
B Plant & Food Research, Private Bag 3230, Hamilton 3240, New Zealand.
C Corresponding author. Email: katherine.tozer@agresearch.co.nz
Crop and Pasture Science 72(11) 947-968 https://doi.org/10.1071/CP21123
Submitted: 18 February 2021 Accepted: 31 May 2021 Published: 15 October 2021
Abstract
Perennial ryegrass (Lolium perenne L.) is a widely sown pasture species in temperate regions. Under heat and moisture-deficit stress, its production is suppressed and tiller mortality increases, particularly when plants are simultaneously exposed to other stresses such as intense defoliation. We investigated the effects of extended grazing exclusion periods in spring and summer on herbage and soils of rotationally grazed, perennial ryegrass-dominant pastures at a summer-wet site and a summer-dry site in sheep and beef hill country in New Zealand. Treatments comprised ‘grazed’ (conventional rotational grazing), ‘early opening’ (grazing exclusion from mid-spring to mid-summer to allow perennial ryegrass to flower), and ‘deferred grazing’ (grazing exclusion from mid-spring to late summer to allow perennial ryegrass to flower and set seed). At both sites, deferred grazing increased perennial ryegrass tiller density and total vegetation cover, and reduced the abundance of broadleaf species and Pseudopithomyces chartarum spores for up to 15 months after exclusion compared with the grazed control. Herbage production was reduced during the deferred period but there was a growth surge thereafter so that herbage production over the study period was similar in the deferred and grazed treatments. Pasture nutritive values were lower in the deferred than the grazed treatment during the exclusion period but were similar in all treatments by the end of the following winter. In the autumn after deferring, seedlings contributed ~50% of the perennial ryegrass tillers present at the summer-dry site but only ~10% at the summer-wet site, where regrowth tillering of existing plants contributed a high proportion of the perennial ryegrass tillers present. Overall, early opening had few effects on the pasture, whereas deferred grazing had numerous positive effects on the pasture but only short-term effects on soil quality.
Keywords: deferred grazing, grazing management, hill country grazing, perennial ryegrass, pasture resilience, soil quality, tiller production.
References
Alberda T (1966) The influence of reserve substances on dry-matter production after defoliation. In ‘Proceedings of the X International Grassland Congress’. 7–16 July 1966. Helsinki, Finland. pp. 140–147. (Finnish Grassland Association: Helsinki, Finland)Anon. (2019) ‘Facing up to facial eczema.’ (Beef + Lamb New Zealand: Wellington, New Zealand)
Blakemore L, Searle PL, Daly BK (1987) Methods for chemical analysis of soils. New Zealand Soil Bureau Scientific Report 80. Department of Scientific and Industrial Research, Lower Hutt, New Zealand.
Briske DD (1996) Strategies of plant survival in grazed systems: a functional interpretation. In ‘The ecology and management of grazing systems’. (Eds J Hodgson, AW Illius) pp. 37–67. (CAB International: Wallingford, UK)
Bullock JM (2000) Gaps and seedling colonization. In ‘Seeds: the ecology of regeneration in plant communities’. (Ed. M Fenner) pp. 375–395. (CABI Publishing: Wallingford, UK)
Cayley JWD, Bird PR (1996) Techniques for measuring pastures. Department of Agriculture Technical Report Series No. 191. Department of Agriculture Energy and Minerals, Melbourne.
Chung H, Zak DR, Reich PB, Ellsworth DS (2007) Plant species richness, elevated CO2, and atmospheric nitrogen deposition alter soil microbial community composition and function. Global Change Biology 13, 980–989.
| Plant species richness, elevated CO2, and atmospheric nitrogen deposition alter soil microbial community composition and function.Crossref | GoogleScholarGoogle Scholar |
Clemence TGA, Hebblethwaite PD (1984) An appraisal of ear, leaf and stem 14CO2 assimilation, 14C-assimilate distribution and growth in a reproductive seed crop of amenity Lolium perenne. Annals of Applied Biology 105, 319–327.
| An appraisal of ear, leaf and stem 14CO2 assimilation, 14C-assimilate distribution and growth in a reproductive seed crop of amenity Lolium perenne.Crossref | GoogleScholarGoogle Scholar |
Collin R, Crawford A, Keogh R, Morris C, Munday R, Phua S, Smith B, Towers N, Wesselink K (1998) ‘Recent research in the prevention of facial eczema.’ (VetLearn Foundation: Palmerston North, New Zealand)
Colvill KE, Marshall C (1981) The patterns of growth, assimilation of 14CO2 and distribution of 14C-assimilate within vegetative plants of Lolium perenne at low and high density. Annals of Applied Biology 99, 179–190.
| The patterns of growth, assimilation of 14CO2 and distribution of 14C-assimilate within vegetative plants of Lolium perenne at low and high density.Crossref | GoogleScholarGoogle Scholar |
Colvill KE, Marshall C (1984) Tiller dynamics and assimilate partitioning in Lolium perenne with particular reference to flowering. Annals of Applied Biology 104, 543–557.
| Tiller dynamics and assimilate partitioning in Lolium perenne with particular reference to flowering.Crossref | GoogleScholarGoogle Scholar |
Corson DG, Waghorn GC, Ulyatt MJ, Lee J (1999) NIRS: forage analysis and livestock feeding. Proceedings of the New Zealand Grassland Association 61, 127–132.
| NIRS: forage analysis and livestock feeding.Crossref | GoogleScholarGoogle Scholar |
Curtin D, Campbell CA (2007) Mineralizable nitrogen. In ‘Soil sampling and methods of analysis’. Ch. 46. (Eds MR Carter, EG Gregorich) (CRC Press: Boca Raton, FL, USA)
Da Silva SC, Hodgson J, Matthews PNP, Matthew C, Holmes CW (1994) Effect of contrasting spring grazing management on summer-autumn pasture and milk production of mixed ryegrass–clover dairy swards. Proceedings of the New Zealand Society of Animal Production 54, 79–82.
Da Silva SC, Hodgson J, Matthew C, Matthews PNP, Holmes CW (2004) Herbage production and animal performance on perennial ryegrass/white clover dairy pastures under alternative spring grazing managements. The Journal of Agricultural Science 142, 97–108.
| Herbage production and animal performance on perennial ryegrass/white clover dairy pastures under alternative spring grazing managements.Crossref | GoogleScholarGoogle Scholar |
Dadkhah M, Gifford GF (1980) Influence of vegetation, rock cover and trampling on infiltration rates and sediment production. Water Resources Bulletin 16, 979–986.
| Influence of vegetation, rock cover and trampling on infiltration rates and sediment production.Crossref | GoogleScholarGoogle Scholar |
Damgaard C (2014) Estimating mean plant cover from different types of cover data: a coherent statistical framework. Ecosphere 5, art20
| Estimating mean plant cover from different types of cover data: a coherent statistical framework.Crossref | GoogleScholarGoogle Scholar |
Dennis N, Amer P, Meier S (2014) Predicting the impact of climate change on the risk of facial eczema outbreaks throughout New Zealand. In ‘Proceedings New Zealand Society of Animal Production’. Napier, New Zealand. Vol. 74. pp. 161–163. (New Zealand Society of Animal Production)
Devantier BP, Stevens DR, Rennie GM, Tozer KN (2017) The effect of deferred grazing in spring and early summer pastures on pasture growth rate and feed quality. Proceedings of the New Zealand Society of Animal Production 79, 189–196.
| The effect of deferred grazing in spring and early summer pastures on pasture growth rate and feed quality.Crossref | GoogleScholarGoogle Scholar |
Di Menna ME, Smith BL, Miles CO (2009) A history of facial eczema (pithomycotoxicosis) research. New Zealand Journal of Agricultural Research 52, 345–376.
| A history of facial eczema (pithomycotoxicosis) research.Crossref | GoogleScholarGoogle Scholar |
Dodd MB, Barker DJ, Wedderburn ME (2004) Plant diversity effects on herbage production and compositional changes in New Zealand hill country pastures. Grass and Forage Science 59, 29–40.
| Plant diversity effects on herbage production and compositional changes in New Zealand hill country pastures.Crossref | GoogleScholarGoogle Scholar |
Doerr S (1998) On standardizing the ‘water drop penetration time’ and the ‘molarity of an ethanol droplet’ techniques to classify soil hydrophobicity: a case study using medium textured soils. Earth Surface Processes and Landforms 23, 663–668.
| On standardizing the ‘water drop penetration time’ and the ‘molarity of an ethanol droplet’ techniques to classify soil hydrophobicity: a case study using medium textured soils.Crossref | GoogleScholarGoogle Scholar |
Dowling PM, Kemp DR, Michalk DL, Klein TA, Millar GD (1996) Perennial grass response to seasonal rests in naturalised pastures of central New South Wales. The Rangeland Journal 18, 309–326.
| Perennial grass response to seasonal rests in naturalised pastures of central New South Wales.Crossref | GoogleScholarGoogle Scholar |
Drewry JJ, Cameron KC, Buchan GD (2008) Pasture yield and soil physical property responses to soil compaction from treading and grazing: a review. Australian Journal of Soil Research 46, 237–256.
| Pasture yield and soil physical property responses to soil compaction from treading and grazing: a review.Crossref | GoogleScholarGoogle Scholar |
Fenner M (1987) Seedlings. New Phytologist 106, 35–47.
| Seedlings.Crossref | GoogleScholarGoogle Scholar |
Fleming P (Ed.) (2003) ‘Lincoln farm technical manual.’ (Farm Management Group, Lincoln University: Christchurch, New Zealand). Available at: https://researcharchive.lincoln.ac.nz/handle/10182/5625
Fletcher JE, Robinson ME (1956) A capacitance meter for estimating forage weight. Society for Range Management 9, 96–97.
| A capacitance meter for estimating forage weight.Crossref | GoogleScholarGoogle Scholar |
Garden DL, Lodge GM, Friend DA, Dowling PM, Orchard BA (2000) Effects of grazing management on botanical composition of native grass-based pastures in temperate south-east Australia. Australian Journal of Experimental Agriculture 40, 225–245.
| Effects of grazing management on botanical composition of native grass-based pastures in temperate south-east Australia.Crossref | GoogleScholarGoogle Scholar |
Gee GW, Or D (2002) Particle size analysis. In ‘Methods of soil analysis. Part 4. Physical methods’. (Eds JH Dame, GC Topp) pp. 255–293. (Soil Science Society of America: Madison, WI, USA)
Geenty K, Morris S (2017) The ‘wash’ method for facial eczema spore counting on pasture. In ‘Guide to New Zealand cattle farming’. p. 144. (Beef + Lamb New Zealand: Wellington, New Zealand)
Geiger R, Aron RH, Todhunter P (Eds) (2003) ‘The climate near the ground.’ (Rowman and Littlefield Publishers: Lanham, MD, USA)
Ghani A, Dexter M, Perrott KW (2003) Hot-water extractable carbon in soils: a sensitive measurement for determining impacts of fertilisation, grazing and cultivation. Soil Biology & Biochemistry 35, 1231–1243.
| Hot-water extractable carbon in soils: a sensitive measurement for determining impacts of fertilisation, grazing and cultivation.Crossref | GoogleScholarGoogle Scholar |
Harris SL, Waugh CD, McCabe RJ, van Vught VT (1999) Effect of deferred grazing during summer on white clover content of Waikato dairy pastures, New Zealand. New Zealand Journal of Agricultural Research 42, 1–7.
| Effect of deferred grazing during summer on white clover content of Waikato dairy pastures, New Zealand.Crossref | GoogleScholarGoogle Scholar |
Hernández Garay A, Hodgson J, Matthew C (1997a) Effect of spring grazing management on perennial ryegrass and ryegrass‐white clover pastures. 1. Tissue turnover and herbage accumulation. New Zealand Journal of Agricultural Research 40, 25–35.
| Effect of spring grazing management on perennial ryegrass and ryegrass‐white clover pastures. 1. Tissue turnover and herbage accumulation.Crossref | GoogleScholarGoogle Scholar |
Hernández Garay A, Matthew C, Hodgson J (1997b) Effect of spring grazing management on perennial ryegrass and ryegrass‐white clover pastures. 2. Tiller and growing point densities and population dynamics. New Zealand Journal of Agricultural Research 40, 37–50.
| Effect of spring grazing management on perennial ryegrass and ryegrass‐white clover pastures. 2. Tiller and growing point densities and population dynamics.Crossref | GoogleScholarGoogle Scholar |
Hewitt AE (2010) ‘New Zealand Soil Classification.’ Landcare Research Science Series No. 1. (Manaaki Whenua Press: Lincoln, New Zealand)
Hewitt AE, Shepherd TG (1997) Structural vulnerability of New Zealand soils. Soil Research 35, 461–474.
| Structural vulnerability of New Zealand soils.Crossref | GoogleScholarGoogle Scholar |
Hu W, Tabley F, Beare M, Tregurtha C, Gillespie R, Qiu W, Gosden P (2018) Short-term dynamics of soil physical properties as affected by compaction and tillage in a silt loam soil. Vadose Zone Journal 17, 180115
| Short-term dynamics of soil physical properties as affected by compaction and tillage in a silt loam soil.Crossref | GoogleScholarGoogle Scholar |
Hume DE, Barker DJ (1991) Natural reseeding of five grass species in summer dry hill country. New Zealand Grassland Association 53, 97–104.
| Natural reseeding of five grass species in summer dry hill country.Crossref | GoogleScholarGoogle Scholar |
Jewiss OR (1972) Tillering in grasses—its significance and control. Grass and Forage Science 27, 65–82.
| Tillering in grasses—its significance and control.Crossref | GoogleScholarGoogle Scholar | 34649260PubMed |
Keeney DR, Nelson DC (1982) Nitrogen - inorganic forms. In ‘Methods of soil analysis. Part 2. Chemical and microbiological properties’. 2nd edn. (Eds AL Page, RH Miller, DR Keeney) pp. 643–709. (American Society of Agronomy and Soil Science Society of America: Madison, WI, USA)
Kennedy KA, Addison PA (1987) Some considerations for the use of visual estimates of plant cover in biomonitoring. Journal of Ecology 75, 151–157.
| Some considerations for the use of visual estimates of plant cover in biomonitoring.Crossref | GoogleScholarGoogle Scholar |
Keuskamp J, Dingemans BJJ, Lehtinen T, Sarneel JM, Hefting MM (2013) Tea Bag Index: a novel approach to collect uniform decomposition data across ecosystems. Methods in Ecology and Evolution 4, 1070–1075.
| Tea Bag Index: a novel approach to collect uniform decomposition data across ecosystems.Crossref | GoogleScholarGoogle Scholar |
Korte CJ, Chu ACP (1983) Some effects of drought on perennial ryegrass swards. Proceedings of the New Zealand Grassland Association 44, 211–216.
| Some effects of drought on perennial ryegrass swards.Crossref | GoogleScholarGoogle Scholar |
Korte CJ, Quilter SJ (1990) Effects of summer grazing and fertiliser on the clover content of hill country swards in the Gisborne region. Proceedings of the New Zealand Grassland Association 51, 113–117.
| Effects of summer grazing and fertiliser on the clover content of hill country swards in the Gisborne region.Crossref | GoogleScholarGoogle Scholar |
Korte CJ, Watkin BR, Harris W (1984) Effects of the timing and intensity of spring grazings on reproductive development, tillering, and herbage production of perennial ryegrass dominant pasture. New Zealand Journal of Agricultural Research 27, 135–149.
| Effects of the timing and intensity of spring grazings on reproductive development, tillering, and herbage production of perennial ryegrass dominant pasture.Crossref | GoogleScholarGoogle Scholar |
L’Huillier PJ, Aislabie DW (1988) Natural reseeding in perennial ryegrass/white clover dairy pastures. Proceedings of the New Zealand Grassland Association 49, 111–115.
| Natural reseeding in perennial ryegrass/white clover dairy pastures.Crossref | GoogleScholarGoogle Scholar |
Lantinga EA, Neuteboom JH, Meijs JAC (2004) Sward methods. In ‘Herbage intake handbook’. 2nd edn. (Ed. A Davies) pp. 23–52. (British Grassland Society: Reading, UK)
Lavorel S, Grigulis K, McIntyre S, Williams NSG, Garden D, Dorrough J, Berman S, Quétier F, Thébault A, Bonis A (2008) Assessing functional diversity in the field: methodology matters! Functional Ecology 22, 134–147.
Litherland AJ, Woodward SJR, Stevens D, McDougal DB, Boom CJ, Knight TL, Lambert MG (2002) Seasonal variations in pasture quality on New Zealand sheep and beef farms. Proceedings of the New Zealand Society of Animal Production 62, 138–142.
Lodge GM (1998) Grazing strategies to increase persistence of Phalaris aquatica L. in summer rainfall areas of temperate Australia. Forage and Grassland Management 22, 111–112.
Mackay A, Budding P, Tatez K, Orchard V, Hart P, Kettles H (1991) Pastoral fallow for improving low fertility hill country pastures. Proceedings of the New Zealand Grassland Association 53, 209–213.
| Pastoral fallow for improving low fertility hill country pastures.Crossref | GoogleScholarGoogle Scholar |
Matthew C (2002) Translocation from flowering to daughter tillers in perennial ryegrass (Lolium perenne L.). Australian Journal of Agricultural Research 53, 21–28.
| Translocation from flowering to daughter tillers in perennial ryegrass (Lolium perenne L.).Crossref | GoogleScholarGoogle Scholar |
Matthew C, Hernández Garay A, Hodgson J (1996) Making sense of the link between tiller density and pasture production. Proceedings of the New Zealand Grassland Association 57, 83–87.
Matthew C, Hernandez-Garay A, Hodgson J (2000) ‘Late control’ spring grazing management of perennial ryegrass swards: effect on sward structure and botanical composition. Agronomy New Zealand 30, 121–127.
Matthew C, Assuero S, Black C, Hamilton N (2015) Tiller dynamics of grazed swards. In ‘Grassland ecophysiology and grazing ecology’. (Eds G Lemaire, J Hodgson, A de Moraes, C Nabinger, PC de F. Carvalho) pp. 127–150. (CAB International: Wallingford, UK)
McCallum DA, Thomson NA, Judd TG (1991) Experiences with deferred grazing at the Taranaki Agricultural Research Station. Proceedings of the New Zealand Grassland Association 53, 79–83.
| Experiences with deferred grazing at the Taranaki Agricultural Research Station.Crossref | GoogleScholarGoogle Scholar |
McIvor JG, Williams J, Gardener CJ (1995) Pasture management influences runoff and soil movement in the semi-arid tropics. Australian Journal of Experimental Agriculture 35, 55–65.
| Pasture management influences runoff and soil movement in the semi-arid tropics.Crossref | GoogleScholarGoogle Scholar |
McKenzie FR (1997) The influence of grazing management on weed invasion of Lolium perenne pastures under subtropical conditions in South Africa. Tropical Grasslands 31, 24–30.
Moore KJ, Moser LE, Vogel KP, Waller SS, Johnson BE, Pedersen JF (1991) Describing and quantifying growth stages of perennial forage grasses. Agronomy Journal 83, 1073–1077.
| Describing and quantifying growth stages of perennial forage grasses.Crossref | GoogleScholarGoogle Scholar |
Nie Z (2011) Use of perennial grass in grazing systems of Southern Australia to adapt to a changing climate. In ‘Climate change: research and technology for adaptation and mitigation’. (Eds JAA Blanco, H Kheradmand) pp. 431–452. (IntechOpen: London)
Nie Z, Zollinger R (2008) Impacts of strategic grazing on herbage accumulation and nutritive value of naturalised hill pasture. In ‘Proceedings of the XXI International Grassland Congress’. Hohhot, China. pp. 337. (Guangdong People’s Publishing House: China)
Nie ZN, Zollinger RP (2012) Impact of deferred grazing and fertilizer on plant population density, ground cover and soil moisture of native pastures in steep hill country of southern Australia. Grass and Forage Science 67, 231–242.
| Impact of deferred grazing and fertilizer on plant population density, ground cover and soil moisture of native pastures in steep hill country of southern Australia.Crossref | GoogleScholarGoogle Scholar |
Nie ZN, Valentine I, Mackay DJ, Barker DJ, Hodgson J (1996) Long-term effects of pastoral fallowing on the distribution and performance of white clover (Trifolium repens L.) in a hill country pasture. Grassland Research and Practice Series 6, 75–78.
| Long-term effects of pastoral fallowing on the distribution and performance of white clover (Trifolium repens L.) in a hill country pasture.Crossref | GoogleScholarGoogle Scholar |
Nie ZN, Mackay AD, Valentine I, Barker DJ, Hodgson J (1997) Influence of pastoral fallow on plant root growth and soil physical and chemical characteristics in a hill pasture. Plant and Soil 197, 201–208.
| Influence of pastoral fallow on plant root growth and soil physical and chemical characteristics in a hill pasture.Crossref | GoogleScholarGoogle Scholar |
Olsen SR, Cole LV, Watanabe FS, Dean LA (1954) Estimation of available phosphorus in soils by extraction with sodium bicarbonate. Circular of U. S. Department of Agriculture No. 939. pp. 1–19. U.S. Government Print Office, Washington, DC.
Ong CK, Marshall C, Saoar GR (1978) The physiology of tiller death in grasses. 2. Causes of tiller death in a grass sward. Grass and Forage Science 33, 205–211.
| The physiology of tiller death in grasses. 2. Causes of tiller death in a grass sward.Crossref | GoogleScholarGoogle Scholar |
Peeters A (2004) ‘Wild and sown grasses. Profiles of a temperate species selection: ecology, biodiversity and use.’ (FAO and Blackwell Publishing: Oxford, UK)
Proffitt A, Bendotti S, Howell M, Eastham J (1993) The effect of sheep trampling and grazing on soil physical properties and pasture growth for a red-brown earth. Australian Journal of Agricultural Research 44, 317–331.
| The effect of sheep trampling and grazing on soil physical properties and pasture growth for a red-brown earth.Crossref | GoogleScholarGoogle Scholar |
Pulley S, Collins A (2019) Field-based determination of controls on runoff and fine sediment generation from lowland grazing livestock fields. Journal of Environmental Management 249, 109365
| Field-based determination of controls on runoff and fine sediment generation from lowland grazing livestock fields.Crossref | GoogleScholarGoogle Scholar | 31442908PubMed |
Rahman A, James TK, Grbavac N, Mellsop J (1995) Evaluation of two methods for enumerating the soil weed seedbank. Proceedings of the New Zealand Plant Protection Conference 48, 175–180.
| Evaluation of two methods for enumerating the soil weed seedbank.Crossref | GoogleScholarGoogle Scholar |
Roy JL, McGill WB (2002) Assessing soil water repellency using the molarity of ethanol droplet (MED) test. Soil Science 167, 83–97.
| Assessing soil water repellency using the molarity of ethanol droplet (MED) test.Crossref | GoogleScholarGoogle Scholar |
Serrano J, Shahidian S, Marques da Silva J (2016) Calibration of GrassMaster II to estimate green and dry matter yield in Mediterranean pastures: effect of pasture moisture content. Crop & Pasture Science 67, 780–791.
| Calibration of GrassMaster II to estimate green and dry matter yield in Mediterranean pastures: effect of pasture moisture content.Crossref | GoogleScholarGoogle Scholar |
Shaw LJ, Burns RG (2006) Enzyme activity profiles and soil quality. In ‘Microbiological methods for assessing soil quality.’ (Eds J Bloem, D Hopkins, A Benedetti.) pp. 158–172. (CABI: Wallingford, UK)
Spaeth KE, Jr (2020) Vegetation effects on hydrology and erosion: grazinglands. In ‘Soil health on the farm, ranch, and in the garden’. pp. 165–226. (Springer Nature: Cham, Switzerland)
Sparling GP, Lilburne L, Vojvodić-Vuković M (2008) ‘Provisional targets for soil quality indicators in New Zealand.’ Landcare Research Science Series No. 34. (Manaaki Whenua Press: Lincoln, Canterbury, New Zealand)
Suckling FET (1959) Pasture management trials on unploughable hill country at Te Awa II. results for 1951–1957. New Zealand Journal of Agricultural Research 2, 488–543.
| Pasture management trials on unploughable hill country at Te Awa II. results for 1951–1957.Crossref | GoogleScholarGoogle Scholar |
Tait A, Henderson R, Turner R, Zheng Z (2006) Thin plate smoothing interpolation of daily rainfall for New Zealand using a climatological rainfall surface. International Journal of Climatology 26, 2097–2115.
| Thin plate smoothing interpolation of daily rainfall for New Zealand using a climatological rainfall surface.Crossref | GoogleScholarGoogle Scholar |
Tozer KN, Cameron CA, Thom ER (2011) Pasture persistence: farmer observations and field measurements. In ‘Proceedings Pasture Persistence Symposium’. Grasslands Research and Practice Series 15. pp. 25–30. (New Zealand Grassland Association)
Tozer KN, Carswell K, Griffiths WM, Crush JR, Cameron CA, Chapman DF, Popay A, King W (2017) Growth responses of diploid and tetraploid perennial ryegrass (Lolium perenne) to soil-moisture deficit, defoliation and a root-feeding invertebrate. Crop & Pasture Science 68, 632–642.
| Growth responses of diploid and tetraploid perennial ryegrass (Lolium perenne) to soil-moisture deficit, defoliation and a root-feeding invertebrate.Crossref | GoogleScholarGoogle Scholar |
Tozer KN, Müller K, Tarbotton I (2020) ‘Deferred grazing handbook. Messages from the Sustainable Farming Fund project Pasture Management in a Volatile World.’ July 2017–September 2020. (AgResearch: Hamilton, New Zealand)
Tozer K, Douglas G, Dodd M, Müller K (2021) Vegetation options for increasing resilience in pastoral hill country. Frontiers in Sustainable Food Systems 5, 550334
| Vegetation options for increasing resilience in pastoral hill country.Crossref | GoogleScholarGoogle Scholar |
Vickery PJ, Nicol GR (1982) An improved electronic capacitance meter for estimating pasture yield: construction details and performance tests. In ‘Animal Research Laboratories Technical Paper No. 9’. (Ed. GR Nicol) (CSIRO: Melbourne)
Vulich SA, Hanrahan JP, O’Riordan EG (1993) Pasture sampling for the estimation of herbage intake using n-alkanes: evaluation of alternative sampling procedures. Irish Journal of Agricultural and Food Research 32, 1–11.
Walker BB, Holling CS, Carpenter SR, Kinzig AP (2004) Resilience, adaptability and transformability in social ecological systems. Ecology and Society 9, 5
Waller RA, Sale PWG (2001) Persistence and productivity of perennial ryegrass in sheep pastures in south-western Victoria: a review. Australian Journal of Experimental Agriculture 41, 117–144.
| Persistence and productivity of perennial ryegrass in sheep pastures in south-western Victoria: a review.Crossref | GoogleScholarGoogle Scholar |
Waller RA, Quigley PE, Saul GR, Kearney GA, Sale PWG (1999) Tactical versus continuous stocking for persistence of perennial ryegrass (Lolium perenne L.) in pastures grazed by sheep in south-western Victoria. Australian Journal of Experimental Agriculture 39, 265–274.
| Tactical versus continuous stocking for persistence of perennial ryegrass (Lolium perenne L.) in pastures grazed by sheep in south-western Victoria.Crossref | GoogleScholarGoogle Scholar |
Watson R, Harris S, Bell N, Neville F (1996) Deferred grazing to enhance white clover content in pastures. Grassland Research and Practice Series 6, 154
| Deferred grazing to enhance white clover content in pastures.Crossref | GoogleScholarGoogle Scholar |
Webby R, Sheath G (2000) The impacts of change in forage quality and seasonality on sheep farm profitability. Proceedings of the New Zealand Grassland Association 62, 189–194.
| The impacts of change in forage quality and seasonality on sheep farm profitability.Crossref | GoogleScholarGoogle Scholar |
Xia JX, Hodgson J, Matthew C, Chu ACP (1990) Tiller population and tissue turnover in a perennial ryegrass pasture under hard and lax spring and summer grazing. Proceeding of the New Zealand Grassland Association 51, 119–121.
| Tiller population and tissue turnover in a perennial ryegrass pasture under hard and lax spring and summer grazing.Crossref | GoogleScholarGoogle Scholar |
Zydenbos SM, Barratt BIP, Bell NL, Ferguson CM, Gerard PJ, Mcneill MR, Phillips CB, Townsend RJ, Jackson TA (2011) The impact of insect pests on pasture persistence and their interrelationship with biotic and abiotic factors. Pasture Persistence – Grassland Research and Practice Series 15, 109–118.
