Effect of timing of forage conservation on forage yield and quality, seed yield and seedling regeneration of four subterranean clover (Trifolium subterraneum) cultivars
B. S. Dear A B , B. F. Hackney A , G. M. Dyce A and C. A. Rodham AA EH Graham Centre for Agricultural Innovation (NSW Department of Primary Industries and Charles Sturt University), Wagga Wagga Agricultural Institute, NSW Department of Primary Industries, PMB, Wagga Wagga, NSW 2650, Australia.
B Corresponding author. Email: brian.dear@dpi.nsw.gov.au
Australian Journal of Experimental Agriculture 48(8) 1133-1142 https://doi.org/10.1071/EA06264
Submitted: 19 September 2006 Accepted: 11 April 2008 Published: 14 July 2008
Abstract
Swards of four cultivars of subterranean clover (Trifolium subterraneum L.) were cut at three different times to determine the effect on forage yield and quality, seed set and seedling regeneration in two successive seasons in southern New South Wales. The four cultivars of subterranean clover (Seaton Park LF, Junee, Goulburn and Clare) were cut on 23–25 September (early cut), 8–10 October (mid cut) or 22–23 October (late cut), to simulate an early silage, late silage or hay cut. Additional treatments imposed included either grazing or leaving the regrowth after cutting and raising the cutting height from 3 to 6 cm.
Forage yields ranged from 3.5 to 9.3 t dry matter (DM)/ha in the first year and from 2.0 to 5.9 t DM/ha in the second year. Herbage yield was influenced by both cultivar and harvest time with the highest yields achieved with the mid cut. Lower forage yields at the later cut were attributed to losses due to respiration and decay under dense leaf canopies.
Changes in forage quality were consistent across both years, with in vivo DM digestibility declining from 76–79% to 69–70% as cutting time was delayed. Crude protein fell from 22–24% to 14–17% over the same period, depending on cultivar.
Seed yields in both years were influenced by both cutting time and cultivar with a positive relationship (R2 = 0.45–0.61) between herbage present in late spring after a period of regrowth and subsequent seed yield. The early flowering cultivar Seaton Park LF had the highest seed yield in both years and the more erect cultivar Clare had the lowest. Seed yields declined with later cutting time but increased by an average of 39% when the cutting height was raised from 3 to 6 cm. Seedling regeneration reflected seed yield responses with the largest seedling regeneration occurring in treatments cut early.
The study found that forage conservation in early October is likely to yield more and be of higher quality than swards cut later in the season. Seed set is greatly reduced by all cutting strategies to levels unprofitable for seed harvesting but may be adequate for pasture regeneration.
Archer KA
(1990) The effects of moisture supply and defoliation during flowering on seed production and hardseededness of Trifolium subterraneum L. Australian Journal of Experimental Agriculture 30, 515–522.
| Crossref | GoogleScholarGoogle Scholar |
Clarke T,
Flinn PC, McGowan AA
(1982) Low cost pepsin-cellulase assays for prediction of digestibility of herbage. Grass and Forage Science 37, 147–150.
| Crossref | GoogleScholarGoogle Scholar |
Cocks PS
(1973) The influence of temperature and density on the growth of communities of subterranean clover (Trifolium subterraneum L. cv. Mount Barker). Australian Journal of Agricultural Research 24, 479–495.
| Crossref | GoogleScholarGoogle Scholar |
Cocks PS
(1974) Potential production of grass and clover monocultures in a Mediterranean-type environment – an experimental approach. Australian Journal of Agricultural Research 25, 835–846.
| Crossref | GoogleScholarGoogle Scholar |
Collins WJ
(1978) The effect of defoliation on inflorescence production, seed yield and hard-seededness in swards of subterranean clover. Australian Journal of Agricultural Research 29, 789–801.
Collins WJ
(1981) The effects of length of growing season, with and without defoliation, on seed yield and hard-seededness in swards of subterranean clover. Australian Journal of Agricultural Research 32, 783–792.
| Crossref | GoogleScholarGoogle Scholar |
Collins WJ,
Rhodes I,
Rossiter RC, Palmer MJ
(1983) The effect of defoliation on seed yield of two strains of subterranean clover grown in monocultures and binary mixtures. Australian Journal of Agricultural Research 34, 671–679.
| Crossref | GoogleScholarGoogle Scholar |
Conlan DJ,
Dear BS, Coombes NE
(1994) Effect of grazing intensity and number of grazings on herbage production and seed yields of Trifolium subterraneum, Medicago murex and Ornithopus compressus. Australian Journal of Experimental Agriculture 34, 181–188.
| Crossref | GoogleScholarGoogle Scholar |
Dear BS,
Cregan PD, Murray GM
(1993) Comparison of the performance of subterranean clover cultivars in southern New South Wales. 1. Persistence, productivity, and seed yields. Australian Journal of Experimental Agriculture 33, 581–590.
| Crossref | GoogleScholarGoogle Scholar |
Fukai S, Silsbury JH
(1976) Responses of subterranean clover communities to temperature. I Dry matter production and plant morphogenesis. Australian Journal of Plant Physiology 3, 527–543.
Fukai S, Silsbury JH
(1978) A growth model for Trifolium subterraneum L. swards. Australian Journal of Agricultural Research 29, 51–65.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
Kaiser AG,
Dear BS, Morris SG
(2007) An evaluation of the yield and quality of oat-legume and ryegrass-legume mixtures and legume monocultures harvested at three stages of growth for silage. Australian Journal of Experimental Agriculture 47, 25–38.
| Crossref | GoogleScholarGoogle Scholar |
Mulholland JG,
Nandra KS,
Scott GB,
Jones AW, Coombes NE
(1996) Nutritive value of subterranean clover in a temperate environment. Australian Journal of Experimental Agriculture 36, 803–814.
| Crossref | GoogleScholarGoogle Scholar |
Myers LF, Squires VR
(1968) Some effects of cutting for hay production on irrigated annual pastures in the following year. Australian Journal of Experimental Agriculture and Animal Husbandry 8, 197–202.
| Crossref | GoogleScholarGoogle Scholar |
Norman HC,
Masters DG,
Rintoul AJ,
Wilmont MG,
Jayasena V,
Loi A, Revell CK
(2005) The relative feeding value of a new pasture legume, eastern star clover (Trifolium dasyurum), compared with subterranean clover. Australian Journal of Agricultural Research 56, 637–644.
| Crossref | GoogleScholarGoogle Scholar |
Rossiter RC
(1961) The influence of defoliation on the components of seed yield in swards of subterranean clover (Trifolium subterraneum L.). Australian Journal of Agricultural Research 12, 821–833.
| Crossref | GoogleScholarGoogle Scholar |
Rossiter RC,
Taylor GB, Klein L
(1994) Environmental effects, in particular of rainfall, on the digestibility of dry mature subterranean clover. Australian Journal of Experimental Agriculture 34, 25–32.
| Crossref | GoogleScholarGoogle Scholar |
Ru YJ, Fortune JA
(2001) Seed yield and nutritive value of dry, mature subterranean clover (Trifolium subterraneum L.) Australian Journal of Experimental Agriculture 41, 169–175.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
Shenk JS, Westerhaus MO
(1991) Population definition, sample selection and calibration procedures for near infrared reflectance spectroscopy. Crop Science 31, 469–474.
Silsbury JH,
Zuill D, Brown PH
(1984) Effects of temperature on germination, emergence and early seedling growth of swards of Mt Barker subterranean clover plants grown with and without nitrate. Australian Journal of Agricultural Research 35, 539–549.
| Crossref | GoogleScholarGoogle Scholar |
Stockdale CR
(1992) The nutritive value of subterranean clover herbage grown under irrigation in northern Victoria. Australian Journal of Agricultural Research 43, 1265–1280.
| Crossref | GoogleScholarGoogle Scholar |
CAS |
Stockdale CR
(2005) The productivity of irrigated legumes in northern Victoria. 3. Frequency and intensity of defoliation of subterranean clover. Australian Journal of Experimental Agriculture 45, 1587–1594.
| Crossref | GoogleScholarGoogle Scholar |
Taylor AO,
Hughes KA,
Haslemore RM, Holland R
(1977) Influence of maturity and frequency of harvest on the nutritive quality of cool season forage legumes. Proceedings of the Agronomy Society of New Zealand 7, 45–49.
